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  • Soft surfactant-assisted uniformly dispersed platinum nanoparticles for high performance electrochemical non-enzymatic glucose sensing platform
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-18
    S.C. Barman, M.F. Hossain, Jae Y. Park

    In this study, highly catalytic platinum nanoparticles (PtNPs) were synthesized on polished Au thin-film electrode using surfactant assisted electrochemical technique (SAET) for a high-performance non-enzymatic glucose sensor. Residual surfactants on the fabricated electrodes were removed by dipping them into a tetrahydrofuran (THF) solution. The physical characteristics of the electrodes were investigated through FESEM, XRD, and EDX, and the analytical analyses were demonstrated with cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and amperometry. After optimization considering the NP deposition potential and time, dipping time in THF, the fabricated biosensor showed a promising electro-oxidation towards glucose in terms of high sensitivity of 5.87 ± 0.13 μAmM−1 cm−2, detection limit of 0.235 μM, wide linear range from 0.25–36 mM, fast response lower than 5 s, and good reproducibility and stability. The proposed SAET can be applied to uniform deposition and dispersion of other nanoparticles for numerous applications. Therefore, the proposed sensing platform can be useful to monitor glucose in diagnostic bioprocess monitoring and environmental monitoring.

    更新日期:2018-07-19
  • Microstructural characterization of Cu-Sn-Zn electrodeposits produced potentiostatically from acid baths based on trisodium nitrilotriacetic
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-17
    Marcos F. de Carvalho, Ivani A. Carlos

    This study characterizes the Cu-Sn-Zn electrodeposits produced potentiostatically from baths containing different concentrations of Cu2+, Sn2+ and Zn2+ ions and 0.60 M trisodium nitrilotriacetic (NTA) at pH 4.99 (higher stability). Ternary electrodeposits were produced onto AISI 1010 steel substrate at electrodeposition potential of −1.60 V with electrodeposition charge density of 3.0 Ccm−2. Chemical composition of electrodeposits varied significantly, presenting higher Cu content (at.%) than that of other elements. Furthermore, it was verified that the high concentration of Sn2+ ions in the baths hindered the reduction of Zn2+ ions, leading to Zn-poor electrodeposits. Microstructure was generally composed of irregular crystallites and clusters of crystallites or dendrites dispersed on the surface, depending on chemical composition. X-ray diffraction showed formation of the ternary alloy by mixture of the Cu5Zn8, η-Cu6Sn5 and Sn pure phases. In addition, electrodeposits with lower Cu content (at.%) also showed the SnO phase. Surface topography of the electrodeposits presented a rough aspect, with arithmetic roughness varying from 1.83 to 3.90 μm for electrodeposits with lower and higher Sn content (at.%), respectively. Adhesion tests indicated that the highest and lowest adherence percentages to the steel substrate were observed for the electrodeposits with the largest Zn and Sn contents (at.%), respectively.

    更新日期:2018-07-18
  • Preparation of reusable nano N-TiO2/graphene/titanium grid sheet for electrosorption-assisted visible light photoelectrocatalytic degradation of a pesticide: Effect of parameters and neural network modeling
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-17
    Baharak Ayoubi-Feiz, Mohammad Hossein Mashhadizadeh, Mohsen Sheydaei

    Nitrogen doped-TiO2 (N-TiO2) nanoparticles were successfully prepared via manual grinding method. Electrophoretic deposition method has been developed to deposit N-TiO2 nanoparticles and graphene (G) nanoplatelets onto titanium grid sheet. The obtained film (N-TiO2/G) was characterized using FESEM, XRD, BET surface area, XPS, FT-IR, and UV–Vis DRS. In the present work, the removal of diazinon as a common pesticide from aqueous solution was investigated by electrosorption-assisted photoelectrocatalytic process using N-TiO2/G nanocomposite under the visible light irradiation. The removal efficiency of diazinon obtained 80% for the electrosorption-assisted photoelectrocatalytic process; while, it was 28.3% for photocatalytic and 23.7% for electrosorption processes, solely. Moreover, even after five successive cycles, the catalyst exhibited constant activity. An artificial neural network (ANN) model was developed to predict the removal of diazinon solution. The findings indicated that the ANN provided reasonable predictive performance (R2 = 0.9995). The relative importance of each studied variable on the electrosorption-assisted photoelectrocatalytic process was evaluated. Diazinon and electrolyte concentrations were found to be the most significant factors, followed by pH, applied bias potential and contact time. The main intermediates of diazinon degradation were identified using GC-Mass spectrometry.

    更新日期:2018-07-18
  • g-C3N4 nanofibers doped poly(3,4-ethylenedioxythiophene) modified electrode for simultaneous determination of ascorbic acid and acetaminophen
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-17
    Caiwei Li, Jianhua Xu, Yuting Wu, Yuehua Zhang, Cheng Zhang, Wu Lei, Qingli Hao

    A fast and sensitive electrochemical sensor for simultaneous determination of ascorbic acid (AA) and acetaminophen (AP) was proposed based on g-C3N4 nanofibers (h-CN) doped poly(3,4-ethylenedioxy-thiophene) (PEDOT) composite. PEDOT/h-CN hybrid film was directly deposited on glass carbon electrode (GCE) by in-situ electropolymerization. The incorporation of h-CN and PEDOT brought out enhanced electro-catalytic activity and additional binding sites for AA and AP, which could be ascribed to the synergetic effect between h-CN and PEDOT. Under the optimal experimental condition, the oxidation peak currents of AA and AP give linear response over the range of 4–20 μM, 20–1800 μM and 1–10 μM, 10–50 μM, respectively. The detection limit of the modified electrode was calculated to be 1.51 μM for AA and 0.49 μM for AP (S/N = 3). The electrochemical experiments also suggested that PEDOT/h-CN modified electrode was feasible practice for quantitative detection of AA and AP.

    更新日期:2018-07-18
  • Metal-organic framework-derived Fe3C@NC nanohybrids as highly-efficient oxygen reduction electrocatalysts in both acidic and basic media
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-17
    Xinxin Yang, Xiaoli Hu, Xiuli Wang, Wei Fu, Tewodros Asefa, Xingquan He

    Developing low-cost and high-performance non-precious metal catalysts (NPMCs) for oxygen reduction reaction (ORR) is of critical importance for commercialization of fuel cells. Herein, we report a NPMC consisting of Fe3C nanoparticles encapsulated in mesoporous N-doped carbon (N-C), which is synthesized by a simple two-step strategy comprising pyrolysis of a mixture of MIL-100(Fe) and dicyandiamide under inert atmosphere, followed by treatment of the product with acidic solution to leach removable Fe3C species from the material. Fe3C@NC-800 (the material prepared at 800 °C) exhibits superior electrocatalytic activity, high durability and excellent methanol tolerance for ORR, with catalytic performance comparable to that of commercial Pt/C in both alkaline and acidic media. Fe3C@NC-800's excellent catalytic activity and stability in ORR are due to its large BET surface area, its large total pore volume, its nitrogen dopants and the cooperative effects between the reactive functionalities in it as well as its excellent conductivity.

    更新日期:2018-07-18
  • Investigation on the electrocatalytic activity of hierarchical flower like architectured Cu3SnS4 for hydrogen evolution reaction
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-17
    V. Maheskumar, P. Gnanaprakasam, T. Selvaraju, B. Vidhya

    Copper tin sulphide (CTS) a prominent absorber layer in photovoltaics has been explored for its electrocatalytic activity in hydrogen evolution reaction (HER) by splitting of water. Here we report the preparation of CTS by two different methods such as ball milling (CTS (B)) and solvothermal (CTS (S)). Subsequently, due to the morphological difference an attempt has been made to explore the electrocatalytic activity between CTS (B) and CTS (S). As an electrocatalyst, it is found that CTS (S) with flower like architecture shows an enhanced electrocatalytic activity with a lower overpotential, a smaller Tafel slope (76 mV/dec) and much larger exchange current density than CTS (B). Furthermore CTS (S) exhibits high stability in acidic medium and meager degradation even after 2000 cycles towards HER catalytic activity. Enhanced catalytic activity, increased electrochemically accessible flower like morphology, high surface area and significantly improved electrochemical conductivity are observed at CTS (S).

    更新日期:2018-07-18
  • Palladium-Prussian blue nanoparticles; as homogeneous and heterogeneous electrocatalysts
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-17
    Prem.C. Pandey, Shwarnima Singh, Alain Walcarius

    We report herein a synthetic strategy based on the use of tetrahydrofuran hydroperoxide (THF-HPO) that allows controlled conversion of palladium ion and potassium ferricyanide into palladium nanoparticles (PdNP) and water soluble Prussian blue nanoparticles (PBNP) respectively. The results revealed that THF-HPO provide a medium to enable the transformation of 3-aminopropyltrimethoxysilane (3-APTMS) capped palladium ions into PdNP of desired nanogeometry viz. PdNP1 and PdNP2. The processability of these two types of nanomaterials enabled the formation of PB-PdNP1 and PB-PdNP2 having potentiality for use either as homogeneous suspension or in heterogeneous matrix. The results based on peroxidase mimetic activity, cyclic voltammetry and amperometry revealed the gradual improvement in analytical performances of as synthesized nanomaterials as a function of palladium size and has been characterized by TEM, HRSEM and EDX analysis.

    更新日期:2018-07-18
  • One-pot synthesis of biochar wrapped Ni/NiO nanobrick composites for supercapacitor applications
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-04-30
    Anjali Paravannoor

    The present study demonstrates a novel approach by which porous brick like nanostructures of nickel oxide can be prepared following a combustion assisted rout. The as synthesized NiO active material is electrophoretically deposited on porous Ni foils and processed into high-surface area thin film electrodes for supercapacitor applications. A detailed study has been performed to elucidate how surface nanomorphology and porosity can impact the pseudocapacitive performances of NiO electrode. From the analysis of the relevant electrochemical parameters, an intrinsic correlation between the electrode performances and these parameters have been deduced and explained. According to single electrode studies the electrodes exhibited a specific capacitance value as high as 1058 F/g at 5 mV/s with good cyclic stability.

    更新日期:2018-07-14
  • Study of the self-assembly process of an oligo(ethylene glycol)-thioacetyl substituted theophylline (THEO) on gold substrates
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-11
    Guadalupe Sánchez-Obrero, Miriam Chávez, Rafael Madueño, Manuel Blázquez, Teresa Pineda, Juan Manuel López-Romero, Francisco Sarabia, Jesús Hierrezuelo, Rafael Contreras

    A new oligo(ethylene glycol)-thioacetyl substituted theophylline (THEO) has been synthesized and used to form self-assembled monolayers (SAMs) on different gold substrates. The THEO-SAMs formed are compact and passivate the gold surface in an important extension. The thioacetyl group can be deprotected to release the mercapto-derivative that gives place to Au-S bond either in the absence or in the presence of base. Evidences that the THEO molecules bind to gold as thiolates are given by the behavior of the reductive desorption process of the SAM as a function of solution pH. However, some of the molecules can suffer breakage in the C-S position releasing thioacetic acid and the fragment oligo(ethylene glycol)-theophylline that can't bind to gold. The thioacetic acid generated at the gold surface can be catalytically decomposed to acetyl and atomic sulfur. The later can be bound to gold as it has been demonstrated by electrochemical as well as by XPS techniques. The resulting THEO-SAM has been structurally characterized by IRRAS. Comparison of the IRRAS with the spectrum of the bulk molecules allows us to conclude about some degree of organization of the THEO chains upon SAM formation. The results of this study can be translated to a gold nanomaterial conjugate to be assayed in studies of theophylline derivatives drug delivery in living systems.

    更新日期:2018-07-12
  • Bilayer N-doped carbon derived from furfuryl alcohol-wrapped melamine sponge as high-performance supercapacitor
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-11
    Yi Feng, Mengjue Cao, Lvye Yang, Xiong-Fei Zhang, Yaquan Wang, Dongbo Yu, Xiaoli Gu, Jianfeng Yao

    Bilayer carbon is synthesized via carbonization of furfural alcohol-wrapped melamine sponge. Such materials combine the merits of carbonized furfuryl alcohol and melamine sponge: melamine sponge-derived three dimensional N-doped carbon serves as skeleton and support to avoid the agglomeration of furfuryl alcohol; while the furfuryl alcohol coating enhances the carbon yield, avoids the nitrogen loss of melamine sponge and introduces the second carbon layer. Carbonized furfuryl alcohol-wrapped melamine sponge shows the highest specific capacitance of 184 F g−1 at the scan rate of 5 mV s−1, which is almost four times that of carbonized melamine sponge without furfuryl alcohol coating (47.3 F g−1 at 5 mV s−1). Based on the electrochemical measurements, it suggests that the nitrogen content, especially the quaternary nitrogen content and the graphitization degree of carbon are two key dominant factors in enhancing the capacitive performance after furfuryl alcohol coating.

    更新日期:2018-07-12
  • Electrochemical sensor for detection of europium based on poly-catechol and ion-imprinted sol-gel film modified screen-printed electrode
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-12
    Jin Chen, Huiping Bai, Jieren Xia, Zixuan Li, Peng Liu, Qiue Cao

    As a result of the increasing applications in different fields, europium has become a threat to the environment and human health. Thus, it is necessary to develop a simple and rapid method for determination of europium in trace level. In this paper, a sensor for determination of Eu3+ was established by modifying a screen printed electrode (SPE) successively with poly catechol as signal amplifying element and Eu(III) ion-imprinted membrane fabricated by sol-gel method as the recognition material. After the factors influenced the sensitivity of the sensor for Eu3+ was optimized in detail, Eu3+ can be determined by differential pulse adsorptive stripping voltammetry (DPASV) in the concentration range of 3.0 × 10−7–1.0 × 10−3 mol L−1 with the detection limit of 1.0 × 10−7 mol L−1. The fabricated sensor owns outstanding selectivity, perfect stability and good regeneration. 50-fold excess concentration of rare earth ions such as Ce3+, Tb3+, Ho3+, Dy3+, Er3+, Gd3+, Pr3+, Nd3+, Yb3+ and 100-fold excess concentration of other metal ions such as Fe3+, Ni3+, Cu2+, Zn2+ and Co2+ have no influence on the determination of 1.0 × 10−5 mol L−1 Eu3+. The obtained sensor, which can maintain >90% of its original response after used >60 times or stored in the water for 2 months, has been satisfactorily used to detect Eu3+ in water samples with the relative standard deviation (RSD) of <3.6% (n = 5) and recoveries in the range of 97.6%–101.6%.

    更新日期:2018-07-12
  • Magnetite nanoparticles/chitosan-modified glassy carbon electrode for non-enzymatic detection of the endocrine disruptor parathion by cathodic square-wave voltammetry
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-09
    Jamille V. Piovesan, Vinícius F. Haddad, Daniel F. Pereira, Almir Spinelli

    A glassy carbon electrode modified with magnetite nanoparticles dispersed in chitosan was employed as electrochemical detector for the determination of parathion in food samples by cathodic square-wave voltammetry. The modified electrode surface was characterized by scanning electron microscopy, cyclic voltammetry and electrochemical impedance spectroscopy. Under optimized experimental conditions, the square-wave voltammograms for parathion obtained with the proposed modified electrode exhibited a well-defined peak at −0.59 V, corresponding to the reduction of the nitro group to the hydroxylamine group. The resultant cathodic peak current was linear for parathion concentrations in the range of 0.34 to 4.46 μmol L−1 (r = 0.997). The limits of detection and quantification were 0.187 and 0.567 μmol L−1, respectively. The novel detector was successfully employed for the analysis of parathion in five food samples (carrot, orange, tomato, lettuce and rice) using the standard addition method. The results were statistically compared with data obtained using the UV–vis technique.

    更新日期:2018-07-10
  • Development of amperometric biosensors using screen-printed carbon electrodes modified with conducting polymer and nanomaterials for the analysis of ethanol, methanol and their mixtures
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-05
    Melike Bilgi, Erol Ayranci

    Amperometric biosensors based on alcohol dehydrogenase (ADH) and alcohol oxidase (AOx) were developed for analysis of ethanol, methanol and their mixtures. The first biosensor based on ADH responds only to ethanol, the second biosensor based on AOx responds to both methanol and ethanol. Screen printed carbon electrodes (SPCEs) were used as the base electrodes. They were first modified with nanoparticles (multiwalled carbon nanotubes and gold nanoparticles) and polyneutral red film. Then the enzyme ADH was immobilized on them to prepare ADH based biosensor for ethanol analysis or the enzyme AOx was immobilized on them to prepare AOx based biosensor for methanol analysis. The analytical characterization parameters sensitivity, linear range, limits of detection and quantification were found as 0.432 μA·mM−1, 178.5–1000 μM, 53.5 μM and 178.5 μM, respectively, for ethanol analysis with AOx based biosensor, as 0.509 μA·mM−1, 335.9–1000 μM, 100.8 μM and 335.9 μM, respectively, for methanol analysis with AOx based biosensor and 0.490 μA·mM−1, 320–1000 μM, 96.1 μM and 320.2 μM, respectively for ethanol analysis with ADH based biosensor. The same parameters were also determined for the analysis of different mixtures with AOx based biosensor. The developed biosensors have been tested on a commercial alcoholic drink for the analysis of its ethanol and methanol contents.

    更新日期:2018-07-08
  • Interfacial characterization and supercapacitive behavior of PEDOT nanotubes modified electrodes
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-05
    Bruna M. Hryniewicz, Herbert Winnischofer, Marcio Vidotti

    PEDOT nanotubes were chemically synthesized using a hexane/water reverse microemulsion polymerization and deposited onto ITO substrate. FTIR polarized specular reflectance spectra are consistent with AOT molecules organized inside the PEDOT nanotubes. The electrochemical properties of PEDOT nanotubes were evaluated by cyclic voltammetry and electrochemical impedance spectroscopy in comparison with PEDOT:PSS modified electrodes. The results indicates an increase in the capacitance and a decrease in the charge transfer resistance for the PEDOT nanotubes in comparison with PEDOT:PSS films due to the higher exposure of the electroactive sites in the nanostructured material. Galvanostatic charge/discharge curves were performed and a maximum specific capacitance of 160 F·g−1 was revealed, indicating that this material has potential to be used in supercapacitors development.

    更新日期:2018-07-08
  • Development of a highly sensitive and selective molecularly imprinted electrochemical sensor for sulfaguanidine detection in honey samples
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-08
    Nadia El Alami El Hassani, Eduard Llobet, Laura-Madalina Popescu, Mihai Ghita, Benachir Bouchikhi, Nezha El Bari

    A simple and highly sensitive approach was performed to synthesize a selective sulfaguanidine (SG) sensor based on a molecularly imprinted electropolymer of acrylamide (PAM) for honey quality control. SG was detected by measurements of electrochemical impedance spectroscopy (EIS) and differential pulse voltammetry (DPV). These techniques were applied successfully to determine SG with an excellent selectivity when compared to the results of interfering compounds. Furthermore, unprecedented, ultra-low limits of detection (LOD) and quantification (LOQ) of 0.20 pg·mL−1 and 0.67 pg·mL−1, respectively according to DPV measurements and 0.17 pg·mL−1 and 0.57 pg·mL−1 according to EIS measurements. The proposed approach is found to be inexpensive, selective and very sensitive, thanks to the good biocompatibility of SG/PAM composite. The results also showed that this sensor was successfully applied to detect SG residues in honey samples with recoveries between 83.9% and 99.7% and had the potential to be further developed for other multiple analytes detection, thus offering an emerging horizon for bio-sensing applications in honey quality control.

    更新日期:2018-07-08
  • Magnetron-sputtering MoS2 on carbon paper and its application as interlayer for high-performance lithium sulfur batteries
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-04
    Jie Li, Yongjia Jiang, Furong Qin, Jing Fang, Kai Zhang, Yanqing Lai

    Marked by high energy density and low material cost, lithium sulfur batteries are considered to be one of the most promising energy storage devices. However, the poor electrochemical performance impedes their practical application. In this work, MoS2 is decorated on carbon nanotubes paper (CNTP) through magnetron sputtering technique to fabricate interlayers for high-performance lithium sulfur batteries. Due to the catalysis of MoS2 on the conversion of sulfur species, lithium sulfur batteries present enhanced electrochemical performance. The initial discharge capacity reaches 1233 mA h g−1 and maintains 850 mA h g−1 after 100 cycles at 0.5C even the sulfur loading is about 3.4 mg cm−2. In addition, the coulombic efficiency is over 96% among all 100 cycles.

    更新日期:2018-07-05
  • Electrochemical behaviour and degradation of methyl parathion on platinum electrode
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-04
    Tomáš Loučka, Marek Došek, Sylvie Kříženecká, Pavel Janoš

    Methyl parathion adsorption from the solution of 0.5 M H2SO4 (M = mol dm−3) on the surface of platinum electrode has be proven. When Pt electrode covered by adsorbed product is cycled between potentials of 0.4 V to −0.23 V, the split of adsorbed molecules of methyl parathion occur and molecules of p-nitrophenol are released. We assume that molecules of methanol are also released besides p-nitrophenol and molecules of methylthiophosphoric acid remain adsorbed on the surface of the platinum electrode. If oxidation of adsorbed product is realized by cycling between potentials of −0.23 V to 1.32 V, the split of adsorbed molecules of methyl parathion occur and molecules p-nitrophenol and methanol are released. The adsorbed methylthiophosphoric acid is completely mineralized. Degradation of methyl parathion was observed in the electrochemical cell with separated electrode compartments. After 12 h of cycling between potentials of −0.23 V to 1.32 V, the concentration of the methyl parathion decreased to 2.5% of starting value (5.3 × 10−5 M).

    更新日期:2018-07-05
  • A stable novel nanostructure of ZnFe2O4 based nanocomposite for improved photoelectrocatalytic and photocatalytic activities
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-03
    I. Neelakanta Reddy, Ch. Venkata Reddy, Adem Sreedhar, Jaesool Shim, Migyung Cho, Kisoo Yoo, Dongseob Kim, Jin Seog Gwag

    A nonagon ZnO–ZnFe2O4 nanocomposite was synthesized using high-energy ball milling followed by post-annealing with an initial mixture of high purity magnetite (Fe3O4) and zincite (ZnO) powders. The effects of the process parameters on the structural, optical, photocatalytic, and photoelectrocatalytic activities were investigated. X-ray diffraction analysis was used to confirm the presence cubic spinel ZnFe2O4 and hexagonal ZnO crystal phases. The lowest optical bandgap observed was 1.83 eV, which decreased due to post-annealing. The photocatalytic activity of the 800 °C post-annealed nanocomposite exhibited the highest degradation percentage of 96% over 180 min under visible light, with a degradation rate constant of 1.5 min−1. Furthermore, the optimized sample showed no substantial decrease in photocatalytic activity after five cycles of the repeated catalysis experiment. In electrochemical studies, when compared to the other post-annealed samples, the 800 °C post-annealed nanocomposite showed the highest water splitting activity with the lowest charge-transfer resistance of 75 Ω, photocurrent density of 4.3 × 10−5 Acm−2, exchange current density of 4.19 log JA−1 cm−2, and Tafel slopes of 74.1 mVdec−1. In dual activities, the performance of the 800 °C post-annealed nanocomposite was noticed to be enhanced. This nanocomposite has potential industrial applications as a cost-effective catalyst.

    更新日期:2018-07-04
  • Facile synthesis of mesoporous NiCo2O4 nanoneedle arrays on three dimensional graphene thin film grown on Ni foam for a high-performance binder-free lithium-ion battery anode
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-03
    Xu Wang, Peng Zhang, Tong Wang, Osamu Yamamoto, Nobuyuki Imanishi, Miao Wang

    Mesoporous NiCo2O4 nanoneedle arrays on graphene film grown directly on a three-dimensional Ni foam have been fabricated by a facile hydrothermal method, accompanied by annealing under air atmosphere. The BET specific surface area of NiCo2O4@graphene film@Ni foam is as high as 47.65 m2 g−1. The porous composites served as a binder-free anode material for lithium-ion batteries display an excellent and stable electrochemical performance with high specific capacities of 1232 mAh g−1 at the current density of 500 mA g−1 over 100 cycles and 1493 mAh g−1 at the current density of 1500 mA g−1 after 230 cycles with Coulombic efficiency higher than 97%. Moreover, a fairly high rate capacity of 586 mAh g−1 retained even at a high current density of 8000 mA g−1. The outstanding electrochemical performance should be attributed to synergetic effect of NiCo2O4 nanoneedle arrays with mesoporous nature and high specific area as well as graphene substrate supporting, which can accommodate the volume variation during the electrochemical reactions and facilitate the ion and electron transmission.

    更新日期:2018-07-04
  • Ultrasonic assisted coating of multiwalled carbon nanotubes with NiFe-layered double hydroxide for improved electrocatalytic oxygen reduction
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-03
    Yu Jun Yang, Weikun Li

    Due to its good electronic conductivity and large specific surface area, multiwalled carbon nanotube (MWCNT) has been proven a good platform for the further fabrication of efficient oxygen reduction reaction (ORR) catalysts. In this work, the nanocomposite of NiFe layered double hydroxides (NiFe-LDHs) and MWCNT was synthesized by the direct coating of MWCNT with NiFe-LDH nanoparticles (NPs) under ultrasonic assistance. It was found out that MWCNT can be easily dispersed in the NiFe-LDH suspension. The dispersed MWCNT was simultaneously coated with NiFe-LDH NPs via the electrostatic interaction between the negatively charged MWCNT and positively charged NiFe-LDH NPs. The obtained nanocomposite (NiFe-LDH/MWCNT) exhibits tube-like structure and good dispersity in polar solvents such as ethanol and water. Further investigation shows that NiFe-LDH/MWCNT possesses excellent ORR activity with 4e-route selectivity, suggesting the synergistic effect between NiFe-LDH and MWCNT. Moreover, NiFe-LDH/MWCNT exhibited improved catalytic capability and durability than commercial Pt/C catalysts.

    更新日期:2018-07-04
  • Particle-electrode impacts: Evidencing partial versus complete oxidation via variable temperature studies
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-03
    Christopher A. Little, Xiuting Li, Christopher Batchelor-McAuley, Neil P. Young, Richard G. Compton

    The partial electro-oxidation of large silver nanoparticles is evidenced by comparing the charges passed in nanoparticle-electrode impacts at a range of temperatures. For larger silver nanoparticles (>100 nm diameter), the variation in the charge passed per nano-impact event at higher temperatures demonstrates that single nanoparticles undergo multiple oxidations events at the electrode, and these oxidations do not go to completion. In contrast, the relative insensitivity of the charge passed in the electrode impacts of smaller silver nanoparticles (<50 nm diameter) to the variation of temperature is consistent with their complete oxidation.

    更新日期:2018-07-03
  • The impact of Fe3+ doping on the flexible polythiophene electrodes for supercapacitors
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-02
    Kezhong Wu, Jiajing Zhao, Ruitao Wu, Bei Ruan, Huating Liu, Mingxing Wu

    Fe3+ doping is used to enhance the capacity of polythiophene as supercapacitor electrode and the flexible Fe3+ doped PTh electrode on carbon cloth is prepared with an electrochemical deposition method. The successful doping of Fe3+ is confirmed by IR, XPS, and EDS measurements. The electrochemical performance of the PTh electrode is evaluated using cyclic voltammetry, galvanostatic charge/discharge technique, and electrochemical impedance spectroscopy in acidic aqueous electrolyte. The pristine PTh exhibits specific capacitance of 77.2 F g−1 at a current density of 0.5 A g−1. After Fe3+ doping, the specific capacitance is improved to 108.1 F g−1 and the retention rate also improved from 7.8% to 21.2% after 1000 charge-discharge circles.

    更新日期:2018-07-02
  • Ternary nanostructures of Cr2O3/graphene oxide/conducting polymers for supercapacitor application
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-02
    Parvin Asen, Saeed Shahrokhian, Azam Iraji zad
    更新日期:2018-07-02
  • Target-induced aptamer displacement on gold nanoparticles and rolling circle amplification for ultrasensitive live Salmonella typhimurium electrochemical biosensing
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-07-02
    Chuang Ge, Rui Yuan, Lin Yi, Jingli Yang, Haiwei Zhang, Lixian Li, Weiqi Nian, Gang Yi

    Salmonella typhimurium (S. typhimurium) infection disease is harm to public through food have become a life-threatening problem stresses an urgent need for development of rapid, robust and cost-effective alternative technology to help control the spread of S. typhimurium. Herein, a simple and facile aptasensor has been developed for ultrasensitive determination of live S. typhimurium by combining target-induced aptamer displacement on gold nanoparticles (AuNPs) deposited electrode with rolling circle amplification (RCA). The heterogeneous recognition and specific binding of target S. typhimurium with aptamer, releasing the primer binding part, leading to anchoring multiple circular templates on the aptasensor surface. Then, the RCA reaction was initiated to produce massive long DNA molecules with multiple tandem-repeat sequences. These RCA products could hybridize with the biotinylated detection probes for enzyme-amplified electrochemical readout on the surface of the aptasensor. The designed electrochemical aptasensor showed very high sensitivity for S. typhimurium down to 16 CFU mL−1 with a wide linear detection range of 20 to 2 × 108 CFU mL−1, and exhibited remarkable signal amplification performance, acceptable reproducibility and low matrix effect. This proposed strategy presented a simple and facile platform towards ultrasensitive and handy bacterial detection, which would become an effective tool for microorganism detection in food safety, clinical diagnostics and even biological threats monitoring.

    更新日期:2018-07-02
  • The effect of N precursors in Fe-N/C type catalysts based on activated silicon carbide derived carbon for oxygen reduction activity at various pH values
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-30
    R. Jäger, P.E. Kasatkin, E. Härk, P. Teppor, T. Romann, R. Härmas, I. Tallo, U. Mäeorg, U. Joost, P. Paiste, K. Kirsimäe, E. Lust
    更新日期:2018-07-01
  • Enhanced oxygen evolution activity of Co3−xNixO4 compared to Co3O4 by low Ni doping
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-30
    Aditi Singhal, Anuj Bisht, Silvia Irusta

    We herein report a series of nanocrystalline Ni-doped Co3O4: Co3−xNixO4 (0.0075 ≤ x ≤ 0.30) with a nickel doping percentage from 0.25 to 10 atomic percent synthesized using solution combustion method. These oxides are characterized by XRD and show pure nanocrystalline phase of Co3O4 with no separated peaks related to Ni/NiOx and confirms that Ni has been substituted in the lattice. TEM results indicate that the morphology and size of all the compounds are similar. Electrochemical measurements indicate that Co3O4 and Co3−xNixO4 are active for oxygen evolution reaction (OER) and also shows that low amount of nickel doping in Co3O4 can remarkably enhance OER activity in neutral, alkaline and buffer (pH-7) electrolytes. Out of all compositions, 0.5% Ni-doped Co3O4 (Co2.985Ni0.015O4) seems to be more active than Co3O4 in terms of both current density and onset potential in K2SO4 medium. The enhancement in terms of OER activity, however, decreases until the doping concentration reaches beyond 0.5%. Phosphate buffer solution (PBS) studies reveal that Co3O4 and 0.5% Ni-doped Co3O4 show OER at near thermodynamic potential. Detailed x-ray photoelectron spectroscopy (XPS) studies have indicated that surface oxygen (lattice oxygen) concentration is an important factor in deciding the OER activity which is highest for 0.5% Ni doped Co3O4 (Co2.985Ni0.015O4) and hence gives the highest OER activity.

    更新日期:2018-07-01
  • Linear sweep voltammetry with non-triangular waveforms at a microdisc electrode
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-30
    Yuki Uchida, Enno Kätelhön, Richard G. Compton

    The voltammetry of an electrochemically reversible reaction at a microdisc electrode is investigated for a semi-circular potential waveform. At the midpoint of the potential window an instantaneous infinite scan rate is observed whilst relatively slow scan rates are seen in other areas of the wave. As a result, the method exhibits a much higher current response than the conventional triangular potential wave thus allowing qualitative analysis of a species with significantly greater ease, particularly at low analyte concentrations in solutions comprising multiple analytes.

    更新日期:2018-07-01
  • Photo-assisted acid-base machine: Battery ensemble to perform work from neutralization reactions
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-28
    William G. Morais, Gilberto Lima, Wellington J.A.S. Gomes, Fritz Huguenin
    更新日期:2018-06-30
  • Three-dimensional β-cyclodextrin functionalized graphene aerogels: An enhanced electrochemical sensing platform for quantification of Ponceau 4R
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-28
    Xue Ma, Yu Xie, Yunhui Yu, Limin Lu, Guangbin Liu, Yongfang Yu, Chunyan Hu
    更新日期:2018-06-30
  • Effect of Sb doping on the transport and electrochemical properties of partially amorphous Sb-SnO2 films
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-27
    A. Ammari, M. Trari, B. Bellal, N. Zebbar

    Sb-doped SnO2 thin films synthesized by sol-gel method were characterized physically and electrochemically. The crystallization was promoted by Sb incorporation in the lattice and the optical gap is blue-shifted due to the quantum confinement. The thermal variation of the electrical conductivity indicates a semiconducting behavior with relaxation process shifted to higher frequencies, typical of hopping mechanism of charge carriers. The hopping length R averages ~1.4 nm and the maximum barrier height (Wm) for the electronic jumps is 878 meV. The interfacial capacitance is characteristic of n-type behavior with an electrons density of 2.7 × 1019 cm−3 and a space charge region of 150 nm. The valence and conduction bands were found to be −0.89 and +2.95 VSCE respectively; they are pH sensitive and sweeping with respect to redox system. The impedance data revealed three distinct electrochemical behaviors with high diffusion process in doped samples marked by the increase of Warburg impedance (0.91–202.3 kΩ·cm2). The optimal band bending with respect to levels (H2O/H2, O2/H2O) and (O2/O2<img border="0" alt="radical dot" src="https://cdn.els-cdn.com/sd/entities/rad">−, OH<img border="0" alt="radical dot" src="https://cdn.els-cdn.com/sd/entities/rad">/H2O), was achieved with localized states mediating the charge exchange.

    更新日期:2018-06-28
  • Carboxyl grafted sulfur-expanded graphite composites as cathodes for lithium-sulfur batteries
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-27
    Sijia Zhao, Ping Li, Jason Adkins, Lele Zhu, Fanghui Du, Qun Zhou, Junwei Zheng
    更新日期:2018-06-28
  • High-performance asymmetric supercapacitor assembled with three-dimensional, coadjacent graphene-like carbon nanosheets and its composite
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-27
    Jing Zhao, Yiju Li, Fengguang Huang, Hongquan Zhang, Junwei Gong, Chenxu Miao, Kai Zhu, Kui Cheng, Ke Ye, Jun Yan, Dianxue Cao, Guiling Wang, Xianfa Zhang
    更新日期:2018-06-28
  • A high-performance glucose/oxygen biofuel cell based on multi-walled carbon nanotube films with electrophoretic deposition
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-27
    Zhaoyin Zhong, Li Qian, Yang Tan, Ge Wang, Lu Yang, Chuantao Hou, Aihua Liu
    更新日期:2018-06-28
  • ZnFe2O4/MoS2/rGO composite as an anode for rechargeable Lithium-ion batteries
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-26
    Lixue Jiang, Wang Gao, Bo Jin, Huan Li, Shanshan Li, Guoren Zhu, Qing Jiang

    The transition metal oxide ZnFe2O4 can be used as a promising anode material for lithium-ion batteries because of its higher theoretical capacity (1072 mA h g−1), and MoS2 has also received extensive attention because of its low cost and environmental friendliness. However, the expansion and contraction of the volume during charge and discharge limit the commercial application of ZnFe2O4 and MoS2. We synthesize ZnFe2O4/MoS2/reduced graphite oxide (ZnFe2O4/MoS2/rGO) ternary composite material by a simple two-step hydrothermal synthesis method and subsequent heat treatment. ZnFe2O4/MoS2/rGO displays a good electrochemical performance due to a synergistic effect of MoS2 with a three-dimensional spherical structure and rGO as a conductive agent. At a current density of 200 mA g−1, the discharge capacity still reaches 1568 mAh g−1 after 100 cycles. At the same time, high-rate performance is also good (638 mAh g−1 at 1800 mA g−1).

    更新日期:2018-06-27
  • 更新日期:2018-06-27
  • Non-enzymatic electrochemical hydrogen peroxide detection using MoS2- Interconnected porous carbon heterostructure
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-23
    Sankararao Mutyala, Josephine Kinsly, G.V.R. Sharma, Chinnathambi Suresh, Jayaraman Mathiyarasu
    更新日期:2018-06-25
  • A fast regression model for the interpretation of electrochemical impedance spectra of intermediate temperature solid oxide fuel cells
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-23
    Simone Campanella, Mauro Bracconi, Alessandro Donazzi

    A frequency domain transformation method is applied to a physically consistent model of an IT-SOFC with MIEC electrolyte. Fast computation of the impedance spectra is achieved, which allows to apply the model to kinetic studies using traditional regressive techniques. The model includes conservation equations of mass and charge, gas diffusive transport effects and leakage current effects due to the semiconductor electrolyte. Global rate equations for the electrocatalytic semi-reactions guarantee economy of calibrated parameters. Two sets of impedance experiments collected on electrolyte-supported Cu-Pd-CZ80-SDC/SDC/LSCF-GDC cells are analyzed. The description of the H2 oxidation process is improved based on experiments with H2/N2 mixtures at fixed temperature and increasing H2 molar fraction (700 °C, 30–100% H2). The introduction of constant phase elements proves essential to closely predict Nyquist and Bode plots: strong inhomogeneity of the anode structure emerges, while the cathodic determining process is better identified via refinement of the double layer capacitance. Novel impedance experiments, performed with a CO-rich mixture (97% CO, 3% CO2) between 600 °C and 700 °C, allow to estimate the kinetic constant for CO electro-oxidation. The variation of the CPE parameters suggests that carbon deposition during exposure to CO simultaneously reduces the anodic active area and double layer capacitance.

    更新日期:2018-06-25
  • Growth and characterization of TiO2 nanotube arrays under dynamic anodization. Photocatalytic activity
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-22
    Claudia Teodora Teodorescu-Soare, C. Catrinescu, M. Dobromir, G. Stoian, Adina Arvinte, D. Luca
    更新日期:2018-06-22
  • Enhanced electrochemical performance of LiNi0.8Co0.1Mn0.1O2 by surface modification with lithium-active MoO3
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-20
    Jie Huang, Xiong Fang, Yina Wu, Le Zhou, Yang Wang, Yuan Jin, Wei Dang, Liping Wu, Zhihao Rong, Xi Chen, Xincun Tang

    LiNi0.8Co0.1Mn0.1O2 cathode materials coated with MoO3 were synthesized via drying coating process with low velocity ball milling. The crystal structure and particle morphology of the sample were examined and observed by X-ray diffraction, scanning electron microscopy and transmission electron microscopy. The results showed that the surface modification had a little change on the samples and illustrated that the components of the coating layer were MoO3/Li2MoO4. Electrochemical results demonstrated that the MoO3 coated samples exhibited preeminent electrochemical performance compared with the bare samples. Particularly for the 3 wt% MoO3 coated samples, its initial coulombic efficiencies increased from 83.3% to 89.0%. Furthermore, the 3 wt% MoO3 coated samples exhibited the highest capacity retention of 94.8% after 100 cycles at 1 C, and possessed the excellent rate discharge performance at a high current density. The electrochemical impedance spectroscopy and cyclic voltammetric results suggested that the layered MoO3 coating could suppress the augmenter of the charge transfer resistance and stabilize the active material structure during cyclic process.

    更新日期:2018-06-22
  • Manioc starch thin film as support of reduced graphene oxide: A novel architecture for electrochemical sensors
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-21
    Luiz O. Orzari, Fabrício A. Santos, Bruno C. Janegitz
    更新日期:2018-06-22
  • 更新日期:2018-06-19
  • Facile synthesis of chitosan-based carbon with rich porous structure for supercapacitor with enhanced electrochemical performance
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-18
    Zhen Lin, Xiaotong Xiang, Shuijiao Peng, Xiancai Jiang, Linxi Hou
    更新日期:2018-06-19
  • Three-dimensionally integrated carbon tubes/MoS2 with reduced graphene oxide foam as a binder-free anode for lithium ion battery
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-18
    Hui Ma, Shaolin Du, Huachao Tao, Tao Li, Yaqiong Zhang

    Three-dimensional foam with integrated core-shell carbon nanotubes-MoS2 with reduced graphene oxide (MoS2/CNT/rGO) has been fabricated by a hydrothermal reaction together with freeze drying. Thin MoS2 nanosheets are coated on the carbon nanotubes (CNT) and distributed on the surface of reduced graphene oxide (rGO) nanosheets. One-dimensional CNT and two-dimensional rGO conductive network not only effectively improves the electron transport and mechanical property, but also prevents the aggregation of MoS2 nanosheets. MoS2 with large interlayer spacing provides more active sites and channels for insertion of lithium ions, while CNT and rGO network acts as a conductive skeleton. The 3D porous and interconnected foam can directly as electrode without any binders and conductive agents. After optimizing the ratio of CNT to rGO, the MoS2/CNT/rGO foam as a freestanding electrode for lithium ion batteries exhibits a high specific capacity of 745 mAh g−1 at a current density of 0.1 A g−1 after 170 cycles and 420 mAh g−1 at 0.5 A g−1 after 200 cycles. This method is easily extended to prepare the other electrode materials, especially the freestanding and flexible electrode.

    更新日期:2018-06-19
  • Electrodeposition of antibacterial Zn-Cu/silver nanoparticle (AgNP) composite coatings from an alkaline solution containing glycine and AgNPs
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-18
    M. Silva-Ichante, Yolanda Reyes-Vidal, Francisco Javier Bácame-Valenzuela, J.C. Ballesteros, Earving Arciga, Ştefan Ţălu, Alia Méndez-Albores, Gabriel Trejo

    The influence of the silver nanoparticle (AgNP) concentration in solution on the electrodeposition of Zn-Cu/AgNP composite coatings was studied by cyclic voltammetry. The composition and structure of the Zn-Cu/AgNP composite coatings were analyzed using glow discharge spectroscopy (GDS), inductively coupled plasma spectrophotometry (ICP), and X-ray diffraction (XRD). The electrodeposition of Zn-Cu/AgNP composites was studied in an electrolytic bath containing glycine and AgNPs in suspension and was shown to occur through two processes with different energies. The first process (Pc′) occurs in the potential range from −0.4 to −0.7 V vs saturated calomel electrode (SCE) and is mainly associated with the electrodeposition of a copper film, while the second process (PcIV) corresponds to the bulk deposition of Zn-Cu/AgNPs and occurs from −1.4 to −1.6 V vs SCE. The formation of different phases of the Zn-Cu alloys and a change in the elemental composition of the coating as a function of the AgNP concentration in solution were observed from the elemental composition analysis. Antimicrobial tests performed on the Zn-Cu/AgNP composite coatings against the microorganisms Escherichia coli as a model gram-negative bacteria and Staphylococcus aureus as a model gram-positive bacteria revealed 95% to 100% inhibition of bacterial growth after 10 min of contact for the Zn-Cu/AgNP coating with a AgNP content of 0.28 wt%.

    更新日期:2018-06-19
  • Analytical low–current impedance of the cathode side of a PEM fuel cell
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-18
    Andrei Kulikovsky

    We derive a simple compact expression for impedance of the cathode side of a PEM fuel cell working at a low current density. The solution includes the faradaic impedance, the impedances due to proton and oxygen transport in the cathode catalyst layer (CCL), and due to oxygen transport in the gas diffusion layer (GDL). The solution works if the cell current density is below 100 mA cm−2. Fitting the model impedance to the experimental spectrum gives the ORR Tafel slope, the double layer capacitance, and the transport parameters of the CCL and GDL.

    更新日期:2018-06-19
  • Fabrication of high-intensity electron transfer electrochemiluminescence interface for Hg2+ detection by using reduced graphene oxide-Au nanoparticles nanocomposites and CdS quantum dots
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-18
    Leqian Hu, Zhimin Liu, Yijie Hu, Haijun Zhan, Junliang Zhu, Xianguo Ge

    A novel electrochemiluminescence (ECL) biosensing interface for Hg2+ analysis was constructed based on the enhanced ECL signal from CdS quantum dots by reduced graphene oxide-Au nanoparticles (RGO-AuNPs) nanocomposites. RGO-AuNPs were prepared by the heat-treatment of graphene oxide and HAuCl4 solution under alkaline environment. The prepared RGO-AuNPs composites were dispersed in N,N-dimethylformamide and dropped onto the surface of glassy carbon electrode (GCE). Double-stranded DNA modified with amino at one end was then immobilized on the RGO-AuNPs/GCE surface in the presence of 1-pyrenebutyric acid N-hydroxysuccinimide linker, following which the avidin-modified CdS quantum dots were linked to double-stranded DNA labeled with biotin at another end through the formation of biotin–avidin complex. The excellent electrical conductivity of RGO-AuNPs nanocomposites and the high charge transfer efficiencies of the double-stranded DNA with T–Hg2+–T complex, which produced high-intensity electron transfer interface and improved the sensitivity of the biosensor. After Hg2+ was added into the detection solution, the increased ECL signals showed good correlation with Hg2+ concentration. The linear range of the sensor was 5.0 × 10−13–1.0 × 10−9 M with a detection limit of 2.0 × 10−13 M. This ECL biosensor showed satisfactory results when used for detecting Hg2+ in real lake water.

    更新日期:2018-06-19
  • 更新日期:2018-06-15
  • 更新日期:2018-06-15
  • Distinguishing skin cancer cells and normal cells using electrical impedance spectroscopy
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-15
    Fan Zhang, Tongyu Jin, Qingqing Hu, Pingang He

    In this study, distinguishing skin cancer cells (A431) and normal cells (HaCaT) was achieved using electrical impedance spectroscopy (EIS) with a novel developed device. The proliferation behaviors of the two cell types during a culture period of 5 days were characterized by the normalized impedance measured at 1465 Hz with simultaneous microscopic imaging for assistance. By fitting to the established equivalent circuits, A431 cells generated smaller resistance (Rc) values with smaller increasing variation, and comparable capacitance (Cc) values with similar decreasing variation compared with HaCaT cells. Moreover, Cc values were linearly correlated to the cell number. The results indicate that these two cell types can be distinguished with EIS based on the differences in the values and variation trends of Rc and Cc during the proliferation process in a real-time and label-free manner. Our work supplies a useful analytical approach for skin cancer cell research and may facilitate the early diagnosis of skin cancer.

    更新日期:2018-06-15
  • 3D nanoporous titania formed by anodization as a promising photoelectrode material
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-15
    Joanna Kapusta-Kołodziej, Adrianna Chudecka, Grzegorz D. Sulka
    更新日期:2018-06-15
  • Kinetics and mechanism of corrosion of mild steel in new types of ionic liquids
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-15
    A.A. Kityk, Y.D. Rublova, A. Kelm, V.V. Malyshev, N.G. Bannyk, I. Flis-Kabulska

    It has been established that the corrosion of mild steel in Ethaline and Reline (choline chloride based deep eutectic solvents with the ethylene glycol and urea respectively) occurs with oxygen depolarization. The rate of corrosion is significantly affected by the contact time of solvents with air and temperature. These two factors determine the physicochemical properties and play a decisive role in the rate of diffusion of the depolarizer, and hence the corrosion rate. It is shown that both solvents are hygroscopic (for 160 h of contact with air in Ethaline 15 vol% of water is detected, in Reline about 7 vol%). It is noted that the rate of corrosion of mild steel in Ethaline is noticeably higher than in Reline. However, when operating temperatures of solvents becomes ≈70 ÷ 80 °C the corrosion rates in Ethaline and Reline is very close to each other, which is primarily due to the convergence of the viscosity parameters. SEM studies of the surface of the steel samples showed that in Ethaline and Reline solvents corrosion occurs with the formation of pitting and elements of subsurface corrosion. The mechanism of corrosion is established and the essential role of chloride anions in the formation of intermediate corrosion products is shown.

    更新日期:2018-06-15
  • Synthesis of binder-free MoSe2 nanoflakes as a new electrode for electrocatalytic hydrogen evolution
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-15
    Vahid Barough, Esmaiel Saievar Iranizad, Amir Bayat, Khadijeh Hemmati
    更新日期:2018-06-15
  • Preparation of one dimensional silver nanowire/nickel-cobalt layered double hydroxide and its electrocatalysis of glucose
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-15
    Jinqiong Xu, Xiujuan Qiao, Muhammad Arsalan, Ni Cheng, Wei Cao, Tianli Yue, Qinglin Sheng, Jianbin Zheng
    更新日期:2018-06-15
  • Photoelectrochemical and photocatalytic investigation of the oxidative formation of H2 from a borane-ammonia complex using an organic p-n bilayer comprising a p-type cobalt phthalocyanine and an n-type perylene derivative
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-15
    Kentaro Fujine, Yuka Sato, Keiji Nagai, Toshiyuki Abe

    An organic p-n bilayer photocatalyst, comprising a perylene derivative (PTCBI, n-type) and cobalt phthalocyanine (CoPc, n-type), is utilized for the oxidative formation of molecular hydrogen (H2) from a borane-ammonia complex (NH3BH3, AB). The formation of H2 occurs photocatalytically at the surface of CoPc in the organo-bilayer, along with the reduction of O2 by a reducing power generated at PTCBI. The mechanism to illustrate the H2-formation from AB by the organo-photocatalyst may be different from that of the conventional photocatalysis by inorganic semiconductors. To further understand the mechanism of H2-formation, photoelectrochemistry is further investigated using the PTCBI/CoPc bilayer as a photoanode. Considering the resulting faradaic efficiency for H2-formation, at least two possible equations have to be suggested: BH3OH− (intermediate) + 3OH− → BO2− + 3/2H2 + 2H2O + 3e− and BH3OH− (intermediate) + 2OH− → BO2− + 2H2 + H2O + 2e−.

    更新日期:2018-06-15
  • The electrochemistry of DPPH in three-phase electrode systems for ion transfer and ion association studies
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-15
    Karuppasamy Dharmaraj, Zahra Nasri, Heike Kahlert, Fritz Scholz

    The three-phase electrochemistry of 2,2-diphenyl-1-picrylhydrazyl (DPPH) has been studied by attaching a droplet of nitrobenzene (NB) containing DPPH to a graphite electrode in an aqueous electrolyte solution. Since DPPH can be reduced to DPPH− and oxidized to DPPH+, the accompanying ion transfer to NB and ion pair formation in NB are accessible. The anion transfer from water to nitrobenzene is accompanied by the formation of ion pairs [DPPH+An−] with nitrate, hexafluorophosphate, perchlorate and trichloroacetate. The ion pair formation of DPPH− with tetrabutylammonium cations is very weak. When the DPPH is dissolved in molten paraffin together with the salt tetrabutylammonium tetrafluoroborate (TBATFB), and composite electrodes are produced by mixing the paraffin with graphite powder, DPPH exhibits a typically surface electrochemical response providing a rather stable system DPPH/DPPH−.

    更新日期:2018-06-15
  • Predominant electronic conductivity of Li2ZnTi3O8 anode material prepared in nitrogen for rechargeable lithium-ion batteries
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-14
    Haoqing Tang, Lingxing Zan, Zhiyuan Tang

    Well-prepared pristine Li2ZnTi3O8 has a great potential to be employed as anode material, which possesses a lager lithium intercalation capacity and excellent rate performance for Li-ion batteries because of its higher electronic conductivity. To obtain an optimal preparation condition, the Li2ZnTi3O8 anode materials were prepared and annealed in air and nitrogen atmospheres for comparison. To our surprise, Li2ZnTi3O8 materials annealed in nitrogen atmosphere exhibits excellent stable cycling life and rate performance indicated by a higher reversible capacity of 181.9 mAh g−1 over 100 cycles at 2000 mA g−1 because it can introduce the oxygen defect and improve the intrinsic electronic conductivity. These superior electrochemical performances are primarily attributed to the ameliorated electronic conductivity, which derives from the change of Ti valence from +4 to +3. Besides, a novel LiNi0.5Mn1.5O4/Li2ZnTi3O8 full cell is configured and it exhibits good rate capacity under 2.0–4.6 V at different charge rates and discharged at 2.0 A g−1. This full cell system exhibits excellent capacity at the high charge and discharge rates and it could be suitable candidate for application in the large capacity storage devices. Moreover, it can also be widely used in the field of the fast charge and discharge electronic products.

    更新日期:2018-06-14
  • Ultra-long BiNbO4 nanowires with hierarchical architecture exhibiting reversible lithium storage
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-12
    Guangxia Tang, Haojie Zhu, Haoxiang Yu, Xing Cheng, Runtian Zheng, Tingting Liu, Jundong Zhang, Miao Shui, Jie Shu
    更新日期:2018-06-12
  • Dual molecular recognition strategy for highly sensitive electrochemical detection of dopamine based on amplification of DNA–Au bio–bar codes
    J. Electroanal. Chem. (IF 3.235) Pub Date : 2018-06-12
    Zhixing Liu, Fuyi Zhou, Jing Wu, Yao Yao, Yuzun Guo, Xianjiu Liao, Fenglei Gao, Yong Qian
    更新日期:2018-06-12
  • 更新日期:2018-06-12
  • 更新日期:2018-06-06
Some contents have been Reproduced with permission of the American Chemical Society.
Some contents have been Reproduced by permission of The Royal Society of Chemistry.
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