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  • The preparation of holey phosphorene by electrochemical assistance
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-12-14
    Honghong Liu, Peichao Lian, Qian Zhang, Ying Yang, Yi Mei

    Black phosphorus (BP), an emerging two-dimensional (2D) layered semiconductor material, has been applied to various fields due to its excellent properties such as remarkable in-plane anisotropy, high carrier mobility, and high on-off ratio. It is well known that the properties of BP depend on its structure and morphology, and the nano-BP is usually superior to bulk BP in terms of application and performance. Up to now, the reported nano-BP with different structure and morphology only includes two-dimensional phosphorene and zero-dimensional BP quantum dots. It is very possible to develop nano-BP with a novel structure to improve the performance and expand its application. In this work, a novel phosphorene with a holey structure was prepared by electrochemical assistance for the first time. The obtained holey phosphorene was characterized by TEM, XPS, Raman, XRD, SEM, AFM and UV–Vis techniques. The relevant results indicate that the thickness of the synthesized holey phosphorene was 1–2 nm (ca. 1–2 layers), and the pore size ranges from a few nanometers to tens of nanometers.

    更新日期:2018-12-14
  • Rapid and label-free, electrochemical DNA detection utilizing the oxidase-mimicking activity of cerium oxide nanoparticles
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-12-14
    Hyo Yong Kim, Jun Ki Ahn, Moon Il Kim, Ki Soo Park, Hyun Gyu Park

    We herein developed a simple and ultrafast electrochemical DNA detection method by utilizing the oxidase-mimicking activity of cerium oxide nanoparticles (CeO2). In the sensor, the presence of DNA, which electrostatically interacts with CeO2 and 3,3′,5,5′-tetramethylbenzidine (TMB) substrate, limits the formation of CeO2-TMB complex that is required for the oxidase-like reaction. As a result, the oxidase-mimicking activity of CeO2 is not effectively exerted, leading to the significantly diminished electrochemical current signal. With this novel strategy, we successfully determined DNA amplicon derived from Escherichia coli (E. coli) with the total assay time <6 min even without the post-purification of DNA amplicon.

    更新日期:2018-12-14
  • Single-step fabrication of electrochemical flow cells utilizing multi-material 3D printing
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-12-13
    Glen D. O'Neil, Shakir Ahmed, Kevin Halloran, Jordyn N. Janusz, Alexandra Rodríguez, Irina M. Terrero Rodríguez

    Here we present methodology for fabricating electrochemical flow cells with embedded carbon-composite electrodes in a single step using simultaneous 3D printing of insulating poly(lactic acid) (PLA) and a commercially available graphene–PLA composite. This work is significant because it is the first demonstration that devices capable of fluid handling and electrochemical sensing can be produced in a single fabrication step using inexpensive equipment. We demonstrate the broad utility of this approach using a channel-flow configuration as an exemplar system for hydrodynamic electrochemistry. The devices were characterized using hydrodynamic electrochemistry, and behave according to the well-established Levich equation. We also characterized the fabrication reproducibility and found that the devices were within 3% RSD. The 3D-printed sensors we employed were modified by electroplating Au and used under flowing conditions to detect catechol, whose oxidation requires two electrons and two protons and is thus more challenging to analyze than the outer-sphere FcCH2OH. We envision these results will pave the way for the development of highly customized micro-total analysis systems that include embedded electrochemical sensors for a variety of redox-active analytes.

    更新日期:2018-12-13
  • Indirect electrografting of aryl iodides
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-12-11
    Catherine Combellas, Frédéric Kanoufi, Jean Pinson, Fetah I. Podvorica

    The electrografting of 4-iodonitrobenzene that is not possible directly is demonstrated while that of 5-iodo-2-amino-pyridine, 4-iodoaniline and iodobenzene is performed with a decrease of overpotential >2 V. The electrografting of aryl iodides is achieved through an iodine abstraction reaction: in the presence of a sterically hindered diazonium salt (2,6-dimethylbenzenediazonium), the aryl iodide is grafted to gold at the much less negative reduction potential of the diazonium salt.

    更新日期:2018-12-11
  • Electrochemical polymerization of polyaniline-reduced graphene oxide composite coating on 5083 Al alloy: Role of reduced graphene oxide
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-12-11
    Suyun Liu, Li Liu, Huaxin Guo, Emeka E. Oguzie, Ying Li, Fuhui Wang

    A polyaniline–reduced graphene oxide composite (PANI-rGO) coating was electrochemically deposited on 5083 Al alloy by potentiostatic method. The coating was characterized by stereoscopic microscopy, SEM, TEM, FTIR and XPS measurements. The anticorrosion performance of PANI-rGO coating was studied using potentiodynamic polarization and EIS measurements in aqueous 3.5% NaCl solution. Results obtained show that the presence of rGO facilitated electro-polymerization of PANI and accelerated the passivation of the Al alloy. The PANI-rGO coating presented good corrosion protection properties.

    更新日期:2018-12-11
  • Electrochemical intercalation of Ca2+ ions into TiS2 in organic electrolytes at room temperature
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-12-10
    Changhee Lee, Yun-Taek Jeong, Paul Maldonado Nogales, Hee-Youb Song, YangSoo Kim, Ri-Zhu Yin, Soon-Ki Jeong

    This work investigates the electrochemical intercalation of Ca2+ ions into TiS2 in organic electrolytes at room temperature and demonstrates that successful intercalation/de-intercalation can be achieved using a 0.1 M solution of Ca(CF3SO3)2 in propylene carbonate (PC) as an electrolyte. Additionally, further performance (charge/discharge capacity, reversibility, and hysteresis) enhancement is observed when a 0.1 M solution of Ca(CF3SO3)2 in a 1:10 (mol/mol) mixture of PC and dimethyl carbonate (DMC) is employed, which is ascribed to the modulation of the solvation environment of Ca2+ ions by the use of the relatively low-polar DMC. Finally, the structural changes in TiS2 caused by Ca2+ intercalation/de-intercalation during charge/discharge are probed by in situ X-ray diffraction analysis.

    更新日期:2018-12-10
  • Ultimate downsizing of d-fructose dehydrogenase for improving the performance of direct electron transfer-type bioelectrocatalysis
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-12-05
    Yuya Kaida, Yuya Hibino, Yuki Kitazumi, Osamu Shirai, Kenji Kano

    d-Fructose dehydrogenase (FDH), a membrane-bound heterotrimeric enzyme, shows strong activity in direct electron transfer (DET)-type bioelectrocatalysis. An FDH variant (Δ1c2cFDH) which lacks 199 amino acid residues including two heme c moieties from N-terminus was constructed, and its DET-type bioelectrocatalytic performance was evaluated with cyclic voltammetry at Au planar electrodes. A DET-type catalytic current of d-fructose oxidation was clearly observed on Δ1c2cFDH-adsorbed Au electrodes. Detailed analysis of the steady-state catalytic current indicated that Δ1c2cFDH transports the electrons to the electrode via heme 3c at a more negative potential and at more improved kinetics than the recombinant (native) FDH.

    更新日期:2018-12-05
  • Tunable metallic nanostructures using 3D printed nanosphere templates
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-12-05
    Bincy Jose, Rajani K. Vijayaraghavan, Lorcan Kent, Sharon O'Toole, John O'Leary, Robert J. Forster

    The use of two-photon 3D printing to create templates for fabricating reproducible and tunable metallic nanostructures is described. The approach allows the structure of the template to be designed specifically for particular applications, e.g., fluid flow control, surface enhanced Raman spectroscopy, metal enhanced fluorescence etc. Here, we show that this method offers excellent control of the size, pitch and packing of spheres on both conducting and insulating substrates, unlike nanosphere lithography. Gold is deposited through these templates and the template then removed using a plasma etching method. In this way, gold nanotriangles, nanodiamonds and nanocavities have been created and characterized using SEM to determine the accuracy of the structures compared to the software designs.

    更新日期:2018-12-05
  • Preparation of a novel iron cryptate as an electrochemical probe for biosensing
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-12-01
    Lintao Lan, Yuanzhong Liu, Xifeng Chen, Tian Zhang, Ningning Dong, Peng Miao

    A novel dicarboxyl-functionalized iron cryptate with a 2,2-pyridine unit has been synthesized, which displays outstanding electrochemical properties in water as a potential biosensing probe. Taking the silver ion (Ag+) as an example, we report a novel Ag+ assay by recording the electrochemical signals of Fe cryptate. In summary, a hairpin-structured DNA probe is designed and modified with the synthesized Fe cryptate. In the absence of Ag+, this is absorbed on the surface of a reduced graphene oxide modified electrode and a significant electrochemical response is obtained. In the presence of Ag+, cytosine–cytosine mismatches in the DNA probe recognize target ions and it is transformed into a conformation which cannot resist digestion by exonuclease III. As a result, Fe cryptate is released and Ag+ is recycled for continuous DNA digestion. By analyzing the reduced electrochemical signals of Fe cryptate, it is possible to quantify the target ions.

    更新日期:2018-12-01
  • Intrinsic Cu nanoparticle decoration of TiO2 nanotubes: A platform for efficient noble metal free photocatalytic H2 production
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-29
    Seyedsina Hejazi, Shiva Mohajernia, Yuhan Wu, Pavlina Andryskova, Giorgio Zoppellaro, Imgon Hwang, Ondrej Tomanec, Radek Zboril, Patrik Schmuki

    In this work, we grow intrinsically Cu-doped TiO2 nanotubes (TiNTs) by self-organizing anodization of Ti–Cu binary alloys. We demonstrate that up to a copper concentration of 1.5 at.% in the alloy, self-ordered Cu2+-doped nanotubes can be grown. Under UV illumination the Cu2+ ion-doped oxide structures can be converted to nanotubes that carry metallic nanoparticles (NPs) uniformly decorated on top of the TiNTs. We investigate the formation of these metallic nanoparticles under UV illumination by scanning electron microscopy (SEM), X-ray photoelectron spectroscopy (XPS) and electron paramagnetic resonance (EPR). The resulting intrinsic copper-doped and decorated TiNTs have a strongly enhanced photocatalytic activity for H2 evolution in comparison to pristine TiNTs. Key is the light-induced conversion of the intrinsic Cu dopant to metallic copper nanoparticles that act as a stable co-catalyst for H2 generation.

    更新日期:2018-11-30
  • Screen-printed electrode as a cost-effective and miniaturized analytical tool for corrosion monitoring of reinforced concrete
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-30
    Alessandro Sassolini, Noemi Colozza, Elena Papa, Kersti Hermansson, Ilaria Cacciotti, Fabiana Arduini

    Herein, we report the first electrochemical sensor based on a screen-printed electrode designed to evaluate the corrosion level in iron-reinforced concrete specimens. The combination of an Ag pseudoreference electrode with a gel polymeric electrolyte allows for fast, stable and cost-effective potentiometric measurements, suitable for evaluating the corrosion of iron bars embedded in concrete samples. The sensor was found to be capable of discriminating between a standard non-corroded sample and samples subject to corrosion due to the presence of chloride or carbonate in the concrete matrix. The potential in concrete-based specimens containing carbonate (pH 9, −0.35 ± 0.03 V) or chloride (4% w/w, −0.52 ± 0.01 V) was found to be more negative than in a standard concrete-based sample (−0.251 ± 0.003 V), in agreement with the ASTM standard C876 method which uses a classical Cu/CuSO4 solid reference electrode. Our results demonstrate that a printed Ag pseudoreference electrode combined with KCl agar provides an efficient and reliable electrochemical system for evaluating the corrosion of iron bars embedded in concrete-based structures.

    更新日期:2018-11-30
  • Atomic layer deposition of cobalt phosphate thin films for the oxygen evolution reaction
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-30
    V. Di Palma, G. Zafeiropoulos, T. Goldsweer, W.M.M. Kessels, M.C.M. van de Sanden, M. Creatore, M.N. Tsampas

    Electrodeposited cobalt phosphate has been reported as a valid alternative to noble metals as an electrocatalyst for the Oxygen Evolution Reaction (OER). In parallel, Atomic Layer Deposition (ALD) is increasingly being used in (photo)electrocatalytic applications. In this contribution we report on the electrocatalytic activity towards OER of ALD-prepared cobalt phosphate thin films. The selected ALD approach enables tuning of the Co-to-P atomic ratio, which is found to significantly affect the activity of the prepared electrocatalyst. Specifically, concurrently with a Co-to-P ratio increase from 1.6 to 1.9, the current density for OER increases from 1.77 mA/cm2 at 1.8 V vs. RHE (Reversible Hydrogen Electrode) to 2.89 mA/cm2 at 1.8 V vs. RHE. Moreover the sample with a Co-to-P ratio of 1.9 has superior performance when compared to electrodeposited cobalt phosphate thin films reported in the literature.

    更新日期:2018-11-30
  • Mesoporous and ultrathin arrays of cobalt nitride nanosheets for electrocatalytic oxygen evolution
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-30
    Chang Liu, Gailing Bai, Xili Tong, Yunwei Wang, Baoying Lu, Nianjun Yang, Xiang-Yun Guo

    Efficient electrocatalysts for oxygen evolution are vitally important for regenerative fuel cells and metal-air batteries. Herein, 3D mesoporous and ultrathin array of CoN nanosheets are synthesized on the Ni foam via thermal transformation of Co3O4 nanowire arrays. This array imparts enhanced active sites, mass diffusion, and electron transfer towards oxygen evolution reaction. The low overpotential of 323 mV at 30 mA cm−2, a Tafel slope of 74 mV dec−1, and a high potential conservation in a long process of electrolysis process are achieved. It is thus one robust and efficient electrocatalyst for OER.

    更新日期:2018-11-30
  • Well-defined Na2Zn3[Fe(CN)6]2 nanocrystals as a low-cost and cycle-stable cathode material for Na-ion batteries
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-29
    Li Xu, Hui Li, Xianyong Wu, Miaomiao Shao, Shuangyu Liu, Bo Wang, Guangyao Zhao, Peng Sheng, Xin Chen, Yu Han, Yuliang Cao, Xinping Ai, Jiangfeng Qian, Hanxi Yang

    Well-defined Na2Zn3[Fe(CN)6]2 nanocrystals (~300 nm) have been fabricated by a facile controlled crystallization method from low-cost precursors at room temperature. By employing [Fe(CN)6]3−/[Fe(CN)6]4− couples as redox centres, this material can realize a theoretical 1Na-storage capacity of 70 mAh g−1, a superior high-rate capability of 20 C and an impressive cycle life of 1000 cycles, offering a low-cost and high-performance alternative cathode for large-scale Na-ion applications.

    更新日期:2018-11-29
  • Negative capacitance or inductive loop? – A general assessment of a common low frequency impedance feature
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-27
    Dino Klotz

    Impedance analysis is not an easy task. This becomes even more obvious if unusual shapes appear in the impedance diagram. Here, a low frequency hook with positive imaginary part is discussed that often leaves researchers clueless of how to handle it, especially if there is no common model for the device under test that includes the hook, which is actually true for most electrochemical systems. The low frequency hook is explained from a systems theory perspective and a very basic explanation is given of what has to happen phenomenologically for this feature to appear. The most common equivalent circuit model (ECM) for such a low frequency hook is reviewed and the relation to a general empirical low-pass filter type model is discussed. A common electrochemical example and an abstract minimal example are introduced to facilitate the interpretation of the low frequency hook for an arbitrary (photo-) electrochemical system.

    更新日期:2018-11-28
  • Investigation of anomalous copper hydride phase during magnetic field-assisted electrodeposition of copper
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-28
    Denise Yin, Heather A. Murdoch, B. Chad Hornbuckle, Efraín Hernández-Rivera, Matthew K. Dunstan

    The electrodeposition of copper in the presence of a magnetic field has previously been shown to affect both electrochemical processes and the microstructure. In this work, we discover a magnetically-induced anomalous second phase in thick films deposited with a current density of 500 mA/cm2 and 0.5 T magnetic field strength. Atom probe tomography suggests the phase is a combination of CuH and CuH2. Formation of the latter phases is likely induced by the applied magnetic field and indicates its role in promoting the hydrogen evolution reaction during deposition.

    更新日期:2018-11-28
  • Ultrasensitive electrochemiluminescence immunosensor with wide linear range based on a multiple amplification approach
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-22
    Xiao-Lei Huo, Nan Zhang, Jing-Juan Xu, Hong-Yuan Chen

    An ultrasensitive and highly selective electrochemiluminescence (ECL) immunosensor is proposed for the detection of prostate specific antigen (PSA) based on multiple amplification via glucose oxidase (GOx) and platinum nanoparticles (Pt NPs) conjugated with polyglutamic acid (PGA). The proposed immunosensor has a wide linear range (1.0 pg/mL–150 ng/mL) and low detection limit (0.6 pg/mL) for PSA detection, which is due in part to the excellent catalytic activity of the Ab2-GOx-PGA-Pt NPs probe toward the luminol ECL reaction.

    更新日期:2018-11-24
  • A universal quasi-reference electrode for in situ EC-STM
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-22
    Andrea Auer, Julia Kunze-Liebhäuser

    The use of an activated carbon based quasi-reference electrode for in situ electrochemical scanning tunneling microscopy was found to allow investigations of electrode/electrolyte interfaces under realistic electrochemical reaction conditions. The implementation of purely inert porous carbon electrode materials, both as reference and counter electrode, ensures a stable reference electrode potential over a wide range of temperatures and in different electrolytes, which renders this electrode ‘universal’. Furthermore, the high surface area carbon can reduce and even eliminate contaminations that might be present in the electrolyte. Activated carbon electrodes can therefore generally contribute to more reliable electrochemical measurements when investigating electrochemical reactions under complex experimental conditions, where the use of classical secondary reference electrodes is impossible or impractical. This is often the case when electrochemistry is combined with in situ interface analytics.

    更新日期:2018-11-24
  • Light enhanced electrochemistry and electrochemiluminescence of luminol at glassy carbon electrodes
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-23
    Zhiyuan Cao, Bin Su

    We report in this work the enhancement effect of light irradiation on the electrochemistry and electrochemiluminescence (ECL) of luminol at the bare glassy carbon electrode (GCE). Light irradiation on the GCE surface induced the formation of hot electron-hole pairs. In alkaline solutions, hot holes can oxidize hydroxide anions to hydroxyl radicals that are capable of promoting the oxidation of luminol to generate larger current and stronger ECL. Moreover, the stability of current and ECL is also significantly improved upon light irradiation. This study provides a simple method to enhance the electrochemistry and ECL of luminol that have promise in improving the sensitivity of luminol-based chemical analysis and bioanalysis.

    更新日期:2018-11-24
  • Two-dimensional circular platinum nanodendrites toward efficient oxygen reduction reaction and methanol oxidation reaction
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-18
    Huiyuan Liu, Jiaqi Qin, Siqin Zhao, Zhanming Gao, Qiang Fu, Yujiang Song

    Two-dimensional circular platinum nanodendrites (~13 nm thick, up to 138.8 nm in diameter) were synthesized by chemical reduction of platinum complexes with ascorbic acid in the presence of block copolymer and pre-formed seeds. The nanodendrites exhibit improved performance toward the oxygen reduction reaction and methanol oxidation reaction compared with platinum black.

    更新日期:2018-11-20
  • Confined electrochemiluminescence in vertically ordered silica mesochannels for the imaging of hydrogen peroxide released from single cells
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-20
    Jingjing Zhang, Hao Ding, Shengyu Zhao, Dechen Jiang, Hong-Yuan Chen

    Here, the confined electrochemiluminescence (ECL) of luminol and hydrogen peroxide is achieved in vertically ordered silica mesochannels (SMCs) and applied to map the efflux of hydrogen peroxide from single living cells. The vertical alignment of SMCs on indium tin oxide (ITO) slides restricts the lateral diffusion of species generated in the ECL process. Accordingly, the cross-talk of luminescence intensity from nearby microregions is minimized for higher-spatial-resolution ECL imaging. The characterization of luminol ECL on these SMC-coated slides yields a detection range of hydrogen peroxide between 5 μM and 1 mM, providing high sensitivity in imaging the efflux of hydrogen peroxide from cells. Compared with the luminescence from individual cells on bare ITO slides, ~4-fold intensity is observed for SMC-coated ITO, suggesting a better electrode surface for single-cell ECL imaging.

    更新日期:2018-11-20
  • The role of formic acid/formate equilibria in the oxidation of formic acid on Pt (111)
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-17
    Carlos Busó-Rogero, Adolfo Ferre-Vilaplana, Enrique Herrero, Juan M. Feliu

    The formic acid oxidation reaction has been studied in concentrated perchloric acid solutions (up to 9.14 M (60%)) on the Pt (111) surface to explore the relationships between interfacial properties and kinetics. It is found that, as the concentration of perchloric acid in the supporting electrolyte increases, the current markedly decreases, making it possible to detect adsorbed formate on the surface by voltammetric methods. With the aid of DFT calculations, it is shown that the diminution in current is the result of two opposing factors: the reduction in the concentration of free formate in solution and electrode charge effects which encourage the adsorption of formate in a particular configuration. Additionally, the electrochemical behavior under highly acidic conditions suggests the formation of clathrate structures and emphasizes the relevance of the water structure effect in electrode adsorption processes.

    更新日期:2018-11-17
  • Click chemistry on azide-functionalized graphene oxide
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-16
    Andreea Cernat, Szabolcs János Györfi, Maria-Bianca Irimes, Mihaela Tertiș, Andreea Bodoki, Ioana-Ecaterina Pralea, Maria Suciu, Cecilia Cristea

    Chemical functionalization of graphene oxide represents a major challenge in chemical engineering with the aim of both improving the properties of the material while generating versatile platforms with a broad range of applications. The development of electrochemical (bio)sensors requires the controlled and rational immobilization of molecules as a key step in the enhancement of analytical performance. Click chemistry reactions represent an important strategy for the covalent linking of different compounds on a substrate via complementary azide or alkyne groups. The mild reaction conditions allow the preservation of the properties of biomolecules, while the orientation towards green chemistry enables a new range of biomedical applications. The azide group was inserted in the graphene oxide backbone by chemical functionalization and the resulting product was characterized by Fourier-transform infrared spectroscopy, scanning electron microscopy and electrochemical impedance spectroscopy. The successful synthesis of the graphene-azide platform was also validated by electrochemical methods performed after clicking ethynylferrocene, an electroactive model molecule. The results show that this new approach is a versatile method for the covalent immobilization of biomolecules.

    更新日期:2018-11-16
  • Corrosion behavior of Hf0.5Nb0.5Ta0.5Ti1.5Zr refractory high-entropy in aqueous chloride solutions
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-16
    Qiongyu Zhou, Saad Sheikh, Ping Ou, Dongchu Chen, Qiang Hu, Sheng Guo

    The Hf0.5Nb0.5Ta0.5Ti1.5Zr refractory high-entropy alloy with excellent corrosion resistance in the 3.5 wt% NaCl solution is identified in this work. This refractory high-entropy alloy exhibits much better general corrosion resistance than that of the 316L stainless steel, due to its corrosion current density being about one fifth of that in the latter. Meanwhile, the pitting potential of Hf0.5Nb0.5Ta0.5Ti1.5Zr reaches an unusually high value of +8.36 V, much higher than that of reported high-entropy alloys. The superior passivity of Hf0.5Nb0.5Ta0.5Ti1.5Zr is accredited to the formation of a single-phase solid solution containing high amount of homogenously distributed passivity-promoting elements, and also the existence of metallic Ta and OH− species in the passive film, which contribute to the high immunity to passive film breakdown.

    更新日期:2018-11-16
  • Morphology evolution of TiO2 nanotubes with additional reducing agent: Evidence of oxygen release
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-16
    Mengshi Yu, Wenqiang Huang, Puying Li, Hao Huang, Kun Zhang, Xufei Zhu

    In order to explore wider application of porous anodic alumina and anodic TiO2 nanotubes (ATNTs), the formation mechanism research of porous anodic materials plays a more significant role. Traditional field-assisted dissolution theory has been put into question and oxygen bubble mold has been accepted gradually. However, it is difficult to prove oxygen release. In this work, we present a method to demonstrate the presence of oxygen in the pores of nanotubes. A kind of water soluble reducing agent (NH4H2PO2) was added into electrolyte containing NH4F. Cavities exists not only between the double walls of nanotubes but also in the inner walls, which are different from normal nanotubes. The morphology evolution of nanotubes results from the reaction between NH4H2PO2 and oxygen. Therefore, the release of oxygen during the formation of ATNTs was further proved.

    更新日期:2018-11-16
  • Electrochemical and in situ SERS study of the role of an inhibiting additive in selective electrodeposition of copper in sulfuric acid
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-15
    Toshio Haba, Katsuyoshi Ikeda, Kohei Uosaki

    The role of an inhibiting additive in selective copper (Cu) deposition was investigated using linear sweep and cyclic voltammetry and in situ SERS. Both the normalized SERS peak intensity of Basic Red 12 and the Cu deposition current showed hysteresis. These results indicate that Basic Red 12 desorbs or decomposes on the surface during electrodeposition of Cu. Therefore the concentration of Basic Red 12 on the patterned area decreases more than that on the flat area. This inhomogeneity of concentration leads to the preferential growth of Cu on the patterned area.

    更新日期:2018-11-15
  • A novel protein binding strategy for energy-transfer-based photoelectrochemical detection of enzymatic activity of botulinum neurotoxin A
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-13
    Peng Lin, Dan Liu, Weiwei Wei, Jiubiao Guo, Shanming Ke, Xierong Zeng, Sheng Chen

    In this work, we propose a novel energy-transfer-based photoelectrochemical (PEC) platform for probing of protein-protein interaction, which associates intimately with zinc-dependent cleavage and substrate specificities in the enzymatic activities of botulinum neurotoxin (BoNT). Specifically, by using substrate protein SNAP-25 as the energy-transfer nanoprobe, an exciton-plasmon interaction (EPI) based strategy between CdS quantum dots (QDs) and Au nanoparticles (NPs) in a PEC system is constructed with the photocurrent declining. Interestingly, the EPI effect is then interrupted by the target botulinum neurotoxin serotype A light chain (BoNT-LCA) special cleavage of the probe SNAP-25, leading to the photocurrent recovery. Therefore, the enzymatic activity of BoNT-LCA could be sensitively detected with a detection limit of 1 pg/mL. Unlike conventional DNA-programable assembly, a protein probe is used to bridge the excitons and plasmons in this work, which provides a new route for the investigation of the EPI-based bioassay.

    更新日期:2018-11-14
  • One-step electrodeposition of ligand-free PdPt alloy nanoparticles from water droplets: Controlling size, coverage, and elemental stoichiometry
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-14
    Andrew D. Pendergast, Matthew W. Glasscott, Christophe Renault, Jeffrey E. Dick

    We present a robust and facile method to produce metal nanoparticle (NP) alloys in a one-step synthesis using direct electrodeposition onto highly oriented pyrolytic graphite (HOPG). Precursor salts, H2PtCl6 and Pd(NO3)2, were dissolved in a 1 mM sodium dodecylsulfate (SDS) water droplet with 1× phosphate buffered saline solution and suspended in a dichloroethane (DCE) continuous phase. Tetrabutylammonium perchlorate was added to the DCE continuous phase to maintain charge balance during electrodeposition. NP fabrication via electrodeposition was driven by droplet collisions onto HOPG, which was biased at a potential where the metal precursor salts would reduce to their respective zero-valent atoms. Scanning Electron Microscopy (SEM) and Energy Dispersive X-ray Spectroscopy (EDX) were used to study the size, coverage, and morphology of the NPs as well as the atomic stoichiometry. EDX mapping indicated homogeneous distribution of Pd and Pt at the single NP level. Homogeneously alloyed PdPt NPs were realized from this study with demonstrated control over metal composition, surface coverage, and NP size.

    更新日期:2018-11-14
  • Liquid electrolyte-free electrochemical oxidation of GaN surface using a solid polymer electrolyte toward electrochemical mechanical polishing
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-14
    Junji Murata, Yoshito Nishiguchi, Takeshi Iwasaki

    Gallium nitride and related materials possess advantageous physical and electrical characteristics for use in high-power/frequency devices and optoelectronics. However, surface preparation of GaN, such as oxidizing and etching, remains difficult owing to its superior chemical and thermal stability compared to conventional semiconductor materials. Thus, high-temperature treatment or ultraviolet irradiation is required to process the GaN surface. Here, we report a novel electrochemical approach for the oxidization of GaN surface using solid polymer electrolyte (SPE), which provides a room-temperature surface treatment free from liquid electrolyte and UV irradiation. The electrochemical system composed of GaN/SPE/cathode can effectively oxidize the GaN surface (~80 nm, 10 min) in the presence of H2O molecules via a reaction with hydroxyl radicals (OH) generated on the SPE membrane. While the surface shows rough and porous features after the removal of oxide by dipping in an alkaline solution, post-oxidation polishing using CeO2 particles removes the oxide film to produce a smooth GaN surface, which demonstrates the potential of oxidation/polishing for GaN wafer fabrication processes.

    更新日期:2018-11-14
  • Production and printing of graphene oxide foam ink for electrocatalytic applications
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-10
    Luis Baptista-Pires, Alfredo de la Escosura-Muñiz, Marc Balsells, Julio C. Zuaznabar-Gardona, Arben Merkoçi
    更新日期:2018-11-10
  • 更新日期:2018-11-09
  • 更新日期:2018-11-05
  • Scaling up anodic TiO2 nanotube layers for gas phase photocatalysis
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-02
    Hanna Sopha, Michal Baudys, Milos Krbal, Raul Zazpe, Jan Prikryl, Josef Krysa, Jan Macak

    In this work, for the first time, an anodic TiO2 nanotube layer of large area (~50 cm2) was used for photocatalysis in the gaseous phase. Hexane was chosen as model pollutant. The nanotube layer showed superior efficiency compared to a reference TiO2 layer of the same thickness composed of immobilized P25 nanoparticles. An additional TiO2 coating of the nanotube layer produced by atomic layer deposition did not enhance the photocatalytic degradation of hexane due to a decrease in the active surface area, in contrast to liquid state photocatalysis under applied external potential.

    更新日期:2018-11-05
  • Efficient electrocatalytic reduction of CO2 to CO on an electrodeposited Zn porous network
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-11-03
    Yu Lu, Bin Han, Chongchong Tian, Jian Wu, Dongsheng Geng, Dawei Wang
    更新日期:2018-11-05
  • Metal-phosphide-doped Li7P3S11 glass-ceramic electrolyte with high ionic conductivity for all-solid-state lithium-sulfur batteries
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-31
    Qi Ge, Lei Zhou, Yimeng Lian, Xiaoling Zhang, Renjie Chen, Wen Yang
    更新日期:2018-11-02
  • Construction of a bioelectrochemical formate generating system from carbon dioxide and dihydrogen
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-27
    Taiki Adachi, Yuki Kitazumi, Osamu Shirai, Kenji Kano
    更新日期:2018-10-27
  • Performance enhancement of PEM electrolyzers through iridium-coated titanium porous transport layers
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-25
    Chang Liu, Marcelo Carmo, Guido Bender, Andreas Everwand, Thomas Lickert, James Young, Tom Smolinka, Detlef Stolten, Werner Lehnert
    更新日期:2018-10-26
  • Electrolyte-gated organic field-effect transistors (EGOFETs) as complementary tools to electrochemistry for the study of surface processes
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-25
    Alexandra Tibaldi, Laure Fillaud, Guillaume Anquetin, Marion Woytasik, Samia Zrig, Benoît Piro, Giorgio Mattana, Vincent Noël
    更新日期:2018-10-25
  • Fabrication of sandwich structured C/NiO/TiO2 nanotube arrays for enhanced electrocatalytic activity towards hydrogen evolution
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-23
    Jun Yang, Lin Cheng, Lingling Wan, Jiabao Yan, Rongsheng Chen, Hongwei Ni
    更新日期:2018-10-23
  • Scanning gel electrochemical microscopy (SGECM): The potentiometric measurements
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-23
    Ning Dang, Mathieu Etienne, Alain Walcarius, Liang Liu
    更新日期:2018-10-23
  • Requirement of initial long-range substrate structure in unusual CO pre-oxidation on Pt(111) electrodes
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-23
    Manuel J.S. Farias, William Cheuquepán, A.A. Tanaka, Juan M. Feliu
    更新日期:2018-10-23
  • A non-enzymatic uric acid sensor utilizing ion channels in the barrier layer of a porous anodic alumina membrane
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-19
    Tiantian Su, Lei He, Rijian Mo, Chunxia Zhou, Zhe Wang, Yi Wang, Pengzhi Hong, Shengli Sun, Chengyong Li
    更新日期:2018-10-22
  • Electrochemical performance of polyacrylonitrile-derived activated carbon prepared via IR pyrolysis
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-18
    M.N. Efimov, V.E. Sosenkin, Yu.M. Volfkovich, A.A. Vasilev, D.G. Muratov, S.A. Baskakov, O.N. Efimov, G.P. Karpacheva
    更新日期:2018-10-19
  • Comparative investigation of CO2 and oxygen reduction on Fe/N/C catalysts
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-16
    Hui-Juan Yang, Jiao Dong, Yu-Hao Hong, Wen-Feng Lin, Zhi-You Zhou, Shi-Gang Sun

    Fe/N/C catalysts have been investigated as promising non-noble metal catalysts for both CO2 reduction reaction (CO2RR) and oxygen reduction reaction (ORR). However, it is unclear whether both reactions hold the same active sites. In this study, the Fe/N/C catalysts were subjected to oxidation treatment in O2 at different temperatures to tune the reactivity. It was found that the oxidation treatment exhibits inverse effects on the CO2RR and ORR. The CO2RR activity was enhanced while ORR activity was suppressed after the oxidation treatment at temperatures from 80 to 240 °C. This result indicates that CO2RR and ORR occur at different active sites. Furthermore, it was evidenced that pyrrolic N increases significantly upon the oxidation treatment, similar to the variation tendency of the CO2RR activity, which suggests that pyrrolic N is highly relevant to the CO2RR on Fe/N/C catalysts.

    更新日期:2018-10-17
  • Two-dimensional vanadium carbide (V2C) MXene as electrode for supercapacitors with aqueous electrolytes
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-16
    Qingmin Shan, Xinpeng Mu, Mohamed Alhabeb, Christopher E. Shuck, Di Pang, Xin Zhao, Xue-Feng Chu, Yingjin Wei, Fei Du, Gang Chen, Yury Gogotsi, Yu Gao, Yohan Dall'Agnese
    更新日期:2018-10-17
  • Enhancing the hydrogen evolution reaction with Ni-W-TiO2 composites
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-17
    Yujia Zhang, Hubert K. Bilan, Elizabeth Podlaha

    The HER kinetics of electrodeposited Ni-W-TiO2 composites of various alloy compositions, and their particle-free counterparts, were characterized using rotating electrodes. The composites exhibited a favorable decrease in the HER Tafel slope, promoting the reaction. An electrochemical ferricyanide reaction was used to evaluate the deposit area. Comparing the composite, with TiO2, to its alloy counterpart, without TiO2, the active surface area depended upon the applied current density of the deposition. When the electroactive areas and the metal W/Ni ratios were similar, electrocatalysts containing TiO2 intrinsically improved HER.

    更新日期:2018-10-17
  • A perfluorocarbon–silicone oil oxygen–selective membrane for ambient operation of aprotic Li–air batteries
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-16
    Yanli Ruan, Jian Sun, Shidong Song, Limei Yu, Butian Chen, Wanjun Li, Xuhui Qin
    更新日期:2018-10-16
  • Electrochemically copper-doped bismuth tellurium selenide thin films
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-10
    M.R. Burton, A. Naylor, Iris S. Nandhakumar

    We report the first results of a study on electrochemically doped copper bismuth tellurium selenide thin films electrodeposited from aqueous nitric acid electrolytes containing up to 2 mM of Cu(NO3)2. The effect of Cu(NO3)2 concentration on the composition, structure and thermoelectric properties of the bismuth tellurium selenide films is investigated by scanning electron microscopy, energy-dispersive X-ray spectroscopy, X-ray diffraction and Seebeck and Hall effect measurements. A Cu(NO3)2 concentration of 1.5 mM is found to offer a Seebeck coefficient of up to −390 μV K−1 at room temperature, which is the highest reported to date for an electrodeposited bismuth tellurium compound.

    更新日期:2018-10-11
  • Impedimetric sensing of the immuno-enzymatic reaction of gliadin with a collagen-modified electrode
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-10
    Fabio Bottari, Ligia Maria Moretto, Paolo Ugo
    更新日期:2018-10-11
  • Redox switchable rhodamine-ferrocene dyad: Exploring imaging possibilities in cells
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-09
    Martina Čížková, Laurent Cattiaux, Justine Pandard, Manon Guille-Collignon, Frédéric Lemaître, Jérôme Delacotte, Jean-Maurice Mallet, Eric Labbé, Olivier Buriez
    更新日期:2018-10-09
  • A continuous in-situ EPR electrochemical reactor as a rapid in-depth mechanistic screening tool for electrocatalysis
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-09
    Sander Neukermans, Jonas Hereijgers, H.Y. Vincent Ching, Mohammad Samanipour, Sabine Van Doorslaer, Annick Hubin, Tom Breugelmans

    In this work, an improved in-situ EPR hydrodynamic electrochemical cell design is constructed and validated. The created platform enables the fast and accurate screening of new electrocatalytic materials, providing insights into their effects on radical products of a reaction. Furthermore, it is essential that the reaction kinetics are not influenced by the set-up and that mass transfer can be controlled. Our modular design allows for fast and easy replacement of parts and adjustments to electrodes in order to unravel the catalysts' influence on radical formation. The proximity of the pseudo-reference electrode to the working electrode in combination with the flow and electrode positioning allows for good potential control. The POM housing allows easy manipulation of the channel and excludes the use of sealing agents.

    更新日期:2018-10-09
  • Electrochemical supercapacitor with thiourea-based aqueous electrolyte
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-06
    Małgorzata Graś, Łukasz Kolanowski, Jarosław Wojciechowski, Grzegorz Lota
    更新日期:2018-10-06
  • Identifying the limiting electrode in lithium ion batteries for extreme fast charging
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-04
    Chengyu Mao, Rose E. Ruther, Jianlin Li, Zhijia Du, Ilias Belharouak
    更新日期:2018-10-04
  • Trimethyl Phosphate Based Neutral Ligand Room Temperature Ionic Liquids for Electrochemical Separation of Rare Earth Elements
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-04
    Prashant Bagri, Huimin Luo, Ilja Popovs, Bishnu P. Thapaliya, Jeremy Dehaudt, Sheng Dai
    更新日期:2018-10-04
  • Water splitting by plasmonic photocatalysts with a gold nanoparticle/cadmium sulfide heteroepitaxial junction: A mini review
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-04
    Hiroaki Tada, Shin-ichi Naya, Musashi Fujishima

    In contrast to the bulk, Au nanoparticles possess unique absorption characteristics due to localized surface plasmon resonance in the visible-to-near-infrared region. Recently, Au nanoparticle-based plasmonic photocatalysts have emerged as promising visible-light photocatalysts for “solar hydrogen” production. This mini review deals with guidelines for the design of highly active plasmonic photocatalysts, highlighting the effect of a heteroepitaxial junction in Au(core)–CdS(shell) nanohybrids on their activity for water splitting, and as a photosensitizer for metal oxide electrodes to improve their performance in photoelectrochemical hydrogen generation from water.

    更新日期:2018-10-04
  • Simple synthesis of two-dimensional MoP2 nanosheets for efficient electrocatalytic hydrogen evolution
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-02
    Yunnan Gao, Mingli Zhang, Jingjing Ding, Song Hong, Justus Masa, Shizhen Liu, Zhenyu Sun

    We report a new method for facile synthesis of MoP2 nanosheets for efficient electrocatalysis of the hydrogen evolution reaction (HER). The resulting MoP2 nanosheets catalyze the HER in 0.5 M H2SO4 with an overpotential of 150 mV being required to deliver a current of 10 mA cm−2, and a Tafel slope of 81.5 mV dec−1 indicating prevalence of a Volmer-Heyrovsky mechanism and hence H2 desorption as the rate limiting step of the reaction. The HER overpotential remained nearly constant after over 1000 cycles of continuous cyclic potential polarization between 0.0 V and −0.4 V, and 10 h of chronoamperometric polarization at an overpotential of 150 mV. This work expands the synthetic methods for MoP2 nanosheets as active, acid-stable and non-noble-metal HER catalysts for large-scale hydrogen production.

    更新日期:2018-10-03
  • Electrochemical self-cleaning anodic surfaces for biofouling control during water treatment
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-02
    Douglas Rice, Paul Westerhoff, François Perreault, Sergi Garcia-Segura

    Biofilm formation and growth on submerged surfaces causes numerous operational problems, ranging from hindering diffusion of pollutants to electrode surfaces during electrochemical water treatment to harboring pathogens in indoor plumbing. This work evaluates electrochemical biofilm dispersion kinetics from boron-doped diamond (BDD) surfaces in situ using optical coherence tomography microscopy to track the volume of biofilm (biovolume) on the electrode. After starting with a 75 μm thick biofilm, applying 50 mA cm−2 results in near complete biofilm removal after 60 min, with a pseudo first-order biovolume removal rate of 0.023 min−1; higher applied currents had negligible additional benefits. Thus, it appears plausible to attain biofouling mitigation through electrochemical self-cleaning of BDD electrodes, potentially via the following two-step process: 1) hydroxyl radical production on the electrode surface which oxidizes polysaccharides or other cellular materials that attach bacteria to surface, followed by 2) gas evolution on the electrode surface (beneath the biofilm), which pushes and sloughs off the biofilm. This novel approach to biofouling management can find applications in electrochemical water treatment and other important surfaces (e.g., electrodes, membrane spacers, heat exchange surfaces, interior pipe surfaces, etc.) in water treatment systems where biofilms develop and harbor microbial pathogens.

    更新日期:2018-10-03
  • Enhanced reversible Li-ion storage in Si@Ti3C2 MXene nanocomposite
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-02
    Fanyu Kong, Xiaodong He, Qianqian Liu, Xinxin Qi, Dongdong Sun, Yongting Zheng, Rongguo Wang, Yuelei Bai

    The Si@Ti3C2 MXene nanocomposite was prepared in this paper by simply ultrasonic mixing of commercially available nanosized Si and Ti3C2 MXene. The introduction of Ti3C2 makes the aggregation of silicon nanoparticles relieved. Electrochemical measurements show that the nanocomposite maintains a reversible capacity of 188 mAh·g−1 at 0.2 A·g−1 after 150 cycles and exhibits improved capacity retention, which are significantly better than those of pure Si. The enhanced cycling stability and rate capability are attributed to the good electrical connection between silicon and Ti3C2. This study provides a new available matrix and guidance for the applications of MXenes in Si-based anode LIBs.

    更新日期:2018-10-03
  • Electrochemical detection of graphene oxide
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-10-03
    Mateusz Gocyla, Marcin Pisarek, Marcin Holdynski, Marcin Opallo
    更新日期:2018-10-03
  • pH-modulated ion-current rectification in a cysteine-functionalized glass nanopipette
    Electrochem. Commun. (IF 4.66) Pub Date : 2018-09-28
    Guo-Chang Liu, Meng-Juan Gao, Wei Chen, Xiao-Yu Hu, Lai-Bo Song, Bo Liu, Yuan-Di Zhao
    更新日期:2018-09-28
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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