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  • Construction of nanoporous gold/g-C3N4 heterostructure for electrochemical supercapacitor
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-16
    A.Y. Chen, T.T. Zhang, Y.J. Qiu, D. Wang, P. Wang, H.J. Li, Y. Li, J.H. Yang, X.Y. Wang, X.F. Xie
    更新日期:2018-10-17
  • The role of conductivity and phase structure in enhancing catalytic activity of CoSe for hydrogen evolution reaction
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-16
    Zhiping Lin, Chengwei Wang, Zongpeng Wang, Qingyun Liu, Congcong Le, Bo Lin, Shougang Chen

    We report for the first time that CoSe with tetragonal metallic phase exhibits high electrocatalytic activity for hydrogen evolution reaction (HER) in acid solution. The prepared tetragonal CoSe exhibits an overpotential of 175 mV versus reversible hydrogen electrode at j = −10 mA cm−2 and a notably low Tafel slope of 36.3 mV dec−1, which are considerably superior to that of CoSe with a hexagonal metallic phase (352 mV and 104.6 mV dec−1). Furthermore, by comparing the catalytic activity of both tetragonal and hexagonal phases of CoSe, our study reveals that the electrical conductivity still dominates on the basis that both phases are metallic. The catalytic activity of hexagonal CoSe can be improved by compounding single walled carbon nanotubes and achieve comparable performance with tetragonal CoSe. Combined with previous works that compare a semiconducting phase and a metallic phase, this work in addition deepens our understanding of the role of conductivity and phase structure in enhancing catalytic activity for HER electrocatalysts.

    更新日期:2018-10-17
  • Construction of non-enzymatic sensor based on porous carbon matrix loaded with Pt and Co nanoparticles for real-time monitoring of cellular superoxide anions
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-16
    Yufei Li, Libo Shi, Xuan Cai, Hongli Zhao, Xiangheng Niu, Minbo Lan

    Quantification of superoxide anions (O2−) is of great significance for the pathological research of many diseases. In this work, a non-enzymatic electrochemical sensor for superoxide sensing was fabricated on the basis of metal-organic frameworks (MOFs)-derived porous carbon matrix loaded with Pt and Co nanoparticles (denoted as Pt-Co-PC). Zeolitic imidazolate framework-67 (ZIF-67) was utilized as the precursor through a one-step calcination under N2 atmosphere to prepare cobalt nanoparticles-porous carbon composites (denoted as Co-PC). Pt-Co-PC was then obtained by using a facile galvanic replacement procedure with Co-PC and chloroplatinic acid solution. Furthermore, the home-made screen printed gold electrodes (SPGEs) were used to immobilize the as-synthesized materials, constructing Pt-Co-PC modified electrochemical sensors. The recommended Pt-Co-PC/SPGE sensors exhibit excellent electrochemical performance for the detection of O2− with an extremely low detection limit of 0.118 μM (S/N = 3) and a high sensitivity of 6.218 × 10−4 mA μM−1 cm−2. Meanwhile, the proposed sensors possess superior reproducibility and stability. More importantly, our sensors have successfully captured the electrochemical signals of O2− released from Hela cells, which means the fabricated sensors have potential application of monitoring O2− in pathological and biological fields.

    更新日期:2018-10-17
  • 更新日期:2018-10-17
  • Fibrous phosphorus: A promising candidate as anode for lithium-ion batteries
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-17
    Zhiyan Chen, Yabo Zhu, Qingmei Wang, Wanying Liu, Yuting Cui, Xueyu Tao, Dekun Zhang

    Phosphorus-based LIBs anode have attracted much attention for its high theoretical capacity. Much work so far has focused on the anode such as commercial red phosphorus and black phosphorus. However, little is known about the other phases of phosphorus. Here, we proposed a promising LIBs anode based on fibrous phosphorus and Hittorf's phosphorus. An Iodine-assisted CVD method was used to synthesize urchin-like fibrous phosphorus crystals and flower-like Hittorf's phosphorus crystals and the morphology of the twin phases was investigated systematically. Hittorf's Phosphorus exhibited an initial capacity of 2113.8 mA h g−1 and a capacity of 558.0 mA h g−1 after 40 cycles, whereas the fibrous phosphorus delivered a slightly lower initial discharge capacity of 1783.0 mA h g−1 but a higher capacity of 817.0 mA h g−1 after 40 cycles. It is concluded that fibrous phosphorus exhibited a best performance comparing with other single phases such as commercial red phosphorus (irreversible) and black phosphorus (the capacity fades from 1800.0 mA h g−1 to 200.0 mA h g−1 after 30 cycles). The Li-ion storage mechanism of fibrous phosphorus was investigated deeply. The uniform rod-like morphology and high conductivity of fibrous phosphorus improved the performance. Besides, the presence of Li3P and LiP phases contributed to the cyclability.

    更新日期:2018-10-17
  • 更新日期:2018-10-17
  • Gas release mitigation in LiFePO4-Li4Ti5O12 Li-ion pouch cells by an H2-selective getter
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-17
    Stefano Zilio, Jessica Manzi, Alessandra Fernicola, Alessio Corazza, Sergio Brutti

    In this work we discuss the mitigation of H2 accumulation upon cycling within a Li-ion battery (LIB) by the use of an hydrogen selective getter (i.e. Suisorb™). This getter has been tested in electrochemical cells constituted by a Li4Ti5O12 (LTO) negative electrode material, a LiFePO4 (LFP) positive electrode material and a common liquid electrolyte (1 M solution of LiPF6 ethylene carbonate/dimethyl-carbonate) absorbed on a Celgard separator. LTO and LFP electrode performance has been analysed in lithium half cells and in full Li-ion configurations by galvanostatic cycling. The gas release within the LIB, assembled without and with the insertion of the getter, has been studied by electrochemical pressure tests to monitor the internal pressure within the cell and by gas chromatography to study the speciation of the gas. The modification of the electrode surface composition has been analysed by photoemission spectroscopy and the alteration in the morphology of the aluminium counter-collectors by electron microscopy. The incorporation of the Suisorb™ getter within LTO/LFP LIBs mitigates the accumulation of molecular hydrogen upon cycling, limits the LiPF6 hydrolysis and LiF formation and decreases the aluminium counter-collector pitting corrosion upon cycling. Furthermore also the battery performance are enhanced by the use of Suisorb™.

    更新日期:2018-10-17
  • 更新日期:2018-10-16
  • Hierarchical NiSe@Co2(CO3)(OH)2 heterogeneous nanowire arrays on nickel foam as electrode with high areal capacitance for hybrid supercapacitors
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-15
    Yuchen Yuan, Rongrong Chen, Hongsen Zhang, Qi Liu, Jingyuan Liu, Jing Yu, Cheng Wang, Zhiyao Sun, Jun Wang
    更新日期:2018-10-16
  • Ionic liquid crystal with fast ion-conductive tunnels for potential application in solvent-free Li-ion batteries
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-15
    Fen Yuan, Shuai Chi, Shunping Dong, Xin Zou, Shuyi Lv, Lixia Bao, Jiliang Wang
    更新日期:2018-10-16
  • Separation of kinetic and mass transport effects in the electrolysis of formic acid in a flow-through cell
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-15
    Qingxin Zhang, Azam Sayadi, Peter G. Pickup

    The effects of mass transport and kinetics have been separated by analysis of the flow rate dependence of the current for formic acid oxidation at fuel cell electrodes in a flow-through cell. The mass transport limiting current was reached when a carbon supported Pd catalyst was used, which allowed the power of the flow rate dependence to be determined. Simulation of the flow rate dependence of the current in the mixed kinetic-mass transport region then allowed the electron transfer rate constant and kinetic current to be determined as a function of potential. Comparison of Tafel plots for the Pd electrode and a Pt black electrode demonstrated that the superior activity of Pd was primarily due to its lower Tafel slope. The flow-through cell geometry allows measurements to be made on fuel cell electrodes at high current densities, and provides kinetic parameters that are not influenced by diffusion of the reactant into the catalyst layer.

    更新日期:2018-10-16
  • NiCoO2@CMK-3 composite with nanosheets-mesoporous structure as an efficient oxygen reduction catalyst
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-15
    Yao Sun, Fei Li, Zichao Shen, Yabei Li, Jinxin Lang, Weimin Li, Guoxin Gao, Shujiang Ding, Chunhui Xiao, Tomokazu Matsue
    更新日期:2018-10-16
  • Electrophoretic deposition of manganese oxide and graphene nanoplatelets on graphite paper for the manufacture of supercapacitor electrodes
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-15
    Juan A. Argüello, José M. Rojo, Rodrigo Moreno

    The preparation of coatings of manganese oxide and graphene nanoplatelets onto graphite paper by aqueous electrophoretic deposition is studied. This method is a fast and environmental friendly procedure for the manufacture of electrodes with enhanced specific capacitance for supercapacitors. The electrodes are prepared either sequentially, depositing consecutively the suspension of each material or simultaneously, from suspensions of mixtures of the two materials. Some of the electrodes show specific capacitances as high as 422 F g−1. The effects of (i) the electrophoretic deposition route chosen and (ii) the composition and load of the active electrode material deposited on the supercapacitor performance are studied. The symmetric supercapacitor cells show specific energy up to 9.2 W h kg−1 and specific power up to 1.8 kW kg−1 for 0.1 and 10 A g−1, respectively. The highest specific energy values are obtained in cells built with electrodes prepared by depositing first a layer of graphene nanoplatelets and then, manganese oxide.

    更新日期:2018-10-16
  • Engineering ordered dendrite-like nickel selenide as electrocatalyst
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-16
    Chao Cai, Yaqun Mi, Shaobo Han, Qi Wang, Wei Liu, Xiaoqiang Wu, Zhi Zheng, Xiang Xia, Liang Qiao, Weilie Zhou, Xiaotao Zu
    更新日期:2018-10-16
  • Growth of Ni-Mn layered double hydroxide and polypyrrole on bacterial cellulose nanofibers for efficient supercapacitors
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-16
    Yan Yuan, Jie Zhou, Muhammad Imran Rafiq, Simeng Dai, Jian Tang, Weihua Tang

    Bacterial cellulose (BC) is an appealing biomass for developing functional electrodes with multiple components along their cross-linked nanofibers. Herein, we demonstrate a BC-directed ternary composite through the successive layer-assembly of polypyrrole (PPy) and bimetallic hydroxide (NiMn-LDH). In our strategy, both in-situ layer-by-layer depositions have been realized at mild conditions (≤25 °C). By tailoring the feeding weights of PPy/BC in NiMn-LDH precursor solutions, the ternary composites the maximum loading of NiMn-LDH has achieved with the highest specific surface. The optimized BC-based electrode material delivers a specific capacity of 653.1 C g−1 at a current density of 1.0 A g−1. Hybrid supercapacitor by assembling NiMn-LDH/PPy/BC as cathode and Fe3O4@C/MWCNTs as anode shows stable performance with a high energy density of 29.8 Wh kg−1 at a power density of 299.0 W kg−1. Our strategy to prepare BC-based electrode materials may provide new opportunities for developing low-cost and efficient energy-storage devices.

    更新日期:2018-10-16
  • The role of molecular crowding in long-range metalloprotein electron transfer: Dissection into site- and scaffold-specific contributions
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-16
    Ulises A. Zitare, Jonathan Szuster, Magali F. Scocozza, Andrés Espinoza-Cara, Alcides J. Leguto, Marcos N. Morgada, Alejandro J. Vila, Daniel H. Murgida

    Here we report the effect of molecular crowding on long-range protein electron transfer (ET) and disentangle the specific responses of the redox site and the protein milieu. To this end, we studied two different one-electron redox proteins that share the cupredoxin fold but differ in the metal centre, T1 mononuclear blue copper and binuclear CuA, and generated chimeras with hybrid properties by incorporating different T1 centres within the CuA scaffold or by swapping loops between orthologous proteins from different organisms to perturb the CuA site. The heterogeneous ET kinetics of the different proteins was studied by protein film electrochemistry at variable electronic couplings and in the presence of two different crowding agents. The results reveal a strong frictional control of the ET reactions, which for 10 Å tunnelling distances results in a 90% drop of the ET rate when viscosity is matched to that of the mitochondrial interior (ca. 55 cP) by addition of either crowding agent. The effect is ascribed to the dynamical coupling of the metal site and the milieu, which for T1 is found to be twice stronger than for CuA, and the activation energy of protein-solvent motion that is dictated by the overall scaffold. This work highlights the need of explicitly considering molecular crowding effects in protein ET.

    更新日期:2018-10-16
  • Hollow mesoporous architecture: A high performance bi-functional photoelectrocatalyst for overall water splitting
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-16
    Muhammad Shakeel, Muhammad Arif, Ghulam Yasin, Baoshan Li, Arif Ullah Khan, Faheem Ullah Khan, Musa Kaleem Baloch

    The metal/metal oxide and halide nanocomposites are emerging and effective photo/electrocatalyst to replace very expensive materials. These are remarkably preferred for efficient hydrogen production in energy conversion and storage technologies. Regardless of recent progress, their activity and durability are still far from adequate, due to less visible light effectiveness, wide band gape and high overpotential and low current density. Herein we successfully applied a novel visible light accessible photo/electrocatalyst, silver-silver bromide doped hollow mesoporous silica-titania (Ag-AgBr/HMST) for overall water splitting. The results of the physicochemical characterization indicates that the nanocomposite has exceptional morphology, high surface area, and uniformly distributed particles. These features exhibits the illustrious visible light induced photo/electrocatalytic behavior for overall water splitting. The hollow silica-titania provides incredible quality conducting channel, to get better mass loading and boost the charge transportation. While well-built connection of Ag, AgBr with titania, provides well active sites that accomplish obvious photo/electrocatalytic performance with OER current density of 10 mAcm−2 at 280 mV and HER current density of 65 mAcm−2 at −173 mV. This is almost equal to RuO2 and Pt/C that are very expensive catalyst for water oxidation. Therefore, the present work establishes the first example of hollow mesoporous photo/electrocatalyst for OER and HER water splitting. The outstanding durability prop up the use of mesoporous material for renewable energy application.

    更新日期:2018-10-16
  • LiFePO4/activated carbon/graphene composite with capacitive-battery characteristics for superior high-rate lithium-ion storage
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-16
    Yibiao Guan, Jinran Shen, Xufang Wei, Qizhen Zhu, Xiaohui Zheng, Shuqin Zhou, Bin Xu

    LiFePO4 is an attractive cathode material for lithium ion battery due to its high capacity of 170 mAh g−1, long cycle life, good safety and low cost, which suffers from the instinct low electron conductivity and poor rate performance. Herein, a composite material consisting of LiFePO4, activated carbon and graphene is synthesized with a facile solvothermal method, which presents excellent high-rate performance with highly-efficiency capacitive-battery characteristics. The obtained LiFePO4/activated carbon/graphene cathode material has hierarchical porous architecture mainly originated from the activated carbon and interconnected conductive networks constructed by the graphene, ensuring both the abundant pathways for Li+ diffusion and the fast electron transfer. Furthermore, the high surface area (367 m2 g−1) provides a double layer capacitive process during charge/discharge process, and also protects the LiFePO4 against the heavy current attack, especially under high current rate. As a result, the capacitive-battery behavior leads to superior rate capability and long cycle life. The LiFePO4/activated carbon/graphene cathode exhibits a remarkable high capacity of 66 mAh g−1 at an extremely high rate of 100 C, and the brilliant cycle stability is confirmed with the capacity retention of 82% after 3000 cycles, promising the high power applications. Furthermore, this study provides a new insight in simple preparation of the capacitive-battery materials by combing the active components and the capacitive components.

    更新日期:2018-10-16
  • Mollusc shell derived 3D porous carbon skeleton for high-performance hybrid electrodes
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-16
    Xu Wu, Huanhuan Zhang, Xiaoyan Liu, Shuyao Li, Qiaofeng Wu, Ke-Jing Huang, Yan Zeng, Zhihong Zhu

    Making composites of low-dimension oxides and carbons is one of the most effective strategies towards better energy storage materials. Among various carbons, biomass derived carbons with many distinguishing features show great advantages. We report herein a highly ordered mollusc-shell derived 3D carbon networks (MSDCN) for high-performance composite electrode materials. When Ni(OH)2 is chosen as a conjoined component, the obtained Ni(OH)2/MSDCN composite exhibits a high specific capacity of 81 mAh g−1 at a high current density of 30 A g−1, and shows no obvious capacity fading during long life cycling at 6 A g−1. Symmetric solid-state energy storage devices based on Ni(OH)2/MSDCN are also assembled, which demonstrates a high energy density of 10.7 W h kg−1 at a power density of 0.51 KW kg−1 with good cycling stability over 10000 cycles. Red light-emitting diode (LED, 2 V) can be easily lightened by the prepared solid-state devices. Meanwhile, the successful synthesis of Co3O4 nanocube/MSDCN and MnO2 nanowire/MSDCN composites further reveal the high application potential of the MSDCN for high performance energy storage devices.

    更新日期:2018-10-16
  • Surface modified MXene film as flexible electrode with ultrahigh volumetric capacitance
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-16
    Xuefeng Zhang, Yong Liu, Shangli Dong, Jianqun Yang, Xudong Liu
    更新日期:2018-10-16
  • Ionic network for aqueous-polymer binders to enhance the electrochemical performance of Li-Ion batteries
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-16
    Cheng-Yu Wu, Jenq-Gong Duh

    Binders play a critical role in the mechanical stabilization of electrodes. However, commercial-grade adhesive polyvinylidene fluoride is soluble in N-methyl-2-pyrrolidone, which is an organic solvent that is both toxic and expensive. Therefore, water-soluble binders have recently been considered as a promising alternative. In this study, an aqueous polymer with an interpenetrating network was introduced as a binder. Poly(acrylic acid), polyvinyl alcohol, and lithiated sulfosuccinic acid precursors were employed for blending through an esterification reaction at a high temperature. This gel-like binder exhibited excellent cycling stability and high coulombic efficiency even at high current densities because of the promotion of ionic conductivity. This ionic polymer was systematically connected with active materials to ameliorate the electrochemical polarization of interfacial resistance. On the basis of these advantages, as well as its low cost, facile manufacturing process, and high performance, this simple method provides a pathway for achieving a commercial-grade high-capacity for Li-ion batteries. The electrochemical performance of LiFePO4/C electrodes maintained a specific capacity of 170 mAhg−1 over 200 cycles at first charge, coupled with a coulombic efficiency of approximately 99% reversibility. In brief, an LiFePO4/C cathode with water-based binders demonstrated superior electrochemical performance in a half-cell test. The development of aqueous processing should provide considerable potential for meeting the requirements of next-generation high-power Li-ion batteries.

    更新日期:2018-10-16
  • A solid-state electrochemiluminescence biosensor for Con A detection based on CeO2@Ag nanoparticles modified graphene quantum dots as signal probe
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-16
    Fumei Zuo, Cong Zhang, Han Zhang, Xingrong Tan, Shihong Chen, Ruo Yuan

    A solid-state electrochemiluminescence (ECL) biosensor for the detection of concanavalin A (Con A) was constructed using graphene quantum dots (GQDs) as luminophore, which were loaded on polyamidoamine (PAMAM) functionalized CeO2@Ag NPs by the interaction between the -NH2 of PAMAM and the -COOH of GQDs. The electrodepositing gold layers were used as matrix to immobilize glucose oxidase (GOx). GOx served as recognition elements to further capture Con A by the specific interaction between carbohydrate and Con A. With the increase of the concentration of Con A, the amount of GOx-CeO2@Ag-GQDs incubated onto the electrode was increased and a higher ECL signal was obtained. The constructed biosensor exhibited a sensitive response towards Con A and a low detection limit of 0.16 pg/mL was obtained. Such a construction strategy provides a new approach for applying GQDs to establish a solid-state ECL biosensor.

    更新日期:2018-10-16
  • Carbonized peat moss electrodes for efficient salinity gradient energy recovery in a capacitive concentration flow cell
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-15
    Haihui Zhu, Wangwang Xu, Guangcai Tan, Elizabeth Whiddon, Ying Wang, Christopher G. Arges, Xiuping Zhu

    The globally extractable salinity gradient (SG) energy from the mixing of seawater and river water is estimated to be 3% of worldwide electricity consumption. Here we applied carbonized peat moss (CPM) electrodes to a capacitive concentration flow cell that is capable of harvesting SG energy based on the capacitive double layer expansion (CDLE) together with the Donnan potential. The electrodes were made from the visually inexhaustible peat moss by a facile and environmental benign pyrolysis process. With two identical CPM electrodes and a cation-exchange membrane, the cell produced a peak power density of 5.33 W m−2 and an average power density of 950 mW m−2, the highest ever reported for CDLE-based techniques, using synthetic seawater (30 g L−1 NaCl) and river water (1 g L−1 NaCl). The excellent performance was a result of the macroporous structure of the CPM electrodes, the assistance of Donnan potential, and the double-channel structure of the cell. This system was durable as it could extract energy from highly saline water (300 g L−1 NaCl) and it still worked well after 100 cycles. This study provides a new method to efficiently and continuously harvest SG energy based on the CDLE without an external charge.

    更新日期:2018-10-15
  • 更新日期:2018-10-15
  • Production of 160 mg/L ozone water using circulating water electrolysis system
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-15
    Fumio Okada, Keiji Nagashima, Takuya Kobayashi

    A circulating water electrolysis system was developed to produce highly concentrated O3-dissolved water (ozone water). It enabled the production of 160 and 112 mg/L ozone water in batch and continuous-withdrawal operation, respectively. The ratios of the actual gas-phase O3 concentrations to those calculated from the dissolved O3 concentration using Henry's law at 1 atm were about 0.5, suggesting the supersaturation of ozone water. Once the O3 gas dissolved in the electrolysis cell operated at 0.15 MPa/G, it should have taken time for the ozone water to reach the gas-liquid equilibrium. The electric conductivity of the ozone water increased to 1.2 mS/cm and the formation of ClO2 was observed at the end of the run. The electrophoretic migration of Cl− ions from the catholyte to the ozone water is considered to be the cause of this impurity. The time dependence of the dissolved O3 concentration and the maximum dissolved O3 concentration obtained in the experiment were well reproduced by a circulating water electrolysis simulator.

    更新日期:2018-10-15
  • 更新日期:2018-10-15
  • 更新日期:2018-10-14
  • Ni–P and TiO2 codeposition on silk textile via supercritical CO2 promoted electroless plating for flexible and wearable photocatalytic devices
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-13
    Wan-Ting Chiu, Chun-Yi Chen, Tso-Fu Mark Chang, Tomoko Hashimoto, Hiromichi Kurosu, Masato Sone
    更新日期:2018-10-14
  • Ortho-di-sodium salts of tetrahydroxyquinone as a novel electrode for lithium-ion and potassium-ion batteries
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-13
    Lei Chen, Shenghong Liu, Yang Wang, Wenfeng Liu, Youzhong Dong, Quan Kuang, Yanming Zhao
    更新日期:2018-10-14
  • A deep eutectic solvent (DES) electrolyte-based vanadium-iron redox flow battery enabling higher specific capacity and improved thermal stability
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-13
    Q. Xu, L.Y. Qin, Y.N. Ji, P.K. Leung, H.N. Su, F. Qiao, W.W. Yang, A.A. Shah, H.M. Li
    更新日期:2018-10-14
  • A novel Pt/pyridine ionic liquid polyoxometalate/rGO tri-component hybrid and its enhanced activities for methanol electrooxidation
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-11
    Hongli Shi, Ruiying Wang, Mengran Lou, Dianzeng Jia, Yong Guo, Xingchao Wang, Yudai Huang, Zhipeng Sun, Tao Wang, Luxiang Wang
    更新日期:2018-10-12
  • Electrochemical Behavior of Tin Foil Anode in Half Cell and Full Cell with Sulfur Cathode
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-12
    Yi Cui, Tianyi Li, Xinwei Zhou, Aaron Mosey, Wei Guo, Ruihua Cheng, Yongzhu Fu, Likun Zhu

    Tin-based (Sn) metal anode has been considered an attractive candidate for rechargeable lithium batteries due to its high specific capacity, safety and low cost. However, the large volume change of Sn during cycling leads to rapid capacity decay. To address this issue, Sn foil was used as a high capacity anode by controlling the degree of lithium uptake. We studied the electrochemical behavior of Sn foil anode in half cell and full cell with sulfur cathode, including phase transform, morphological change, discharge/charge profiles and cycling performance. Enhanced cycling performance has been achieved by limiting the lithiation capacity of the Sn foil electrode. A full cell consisting of a pre-lithiated Sn foil anode and a sulfur cathode was constructed and tested. The full cell exhibits an initial capacity of 1142 mAh g-1 (based on the sulfur mass in the cathode), followed by stable cycling performance with a capacity retention of 550 mAh g-1 after 100 cycles at C/2 rate. This study reports a potential prospect to utilize Sn and S as a combination in rechargeable lithium batteries.

    更新日期:2018-10-12
  • First principles calculation of redox potential for tetravalent actinides in molten LiCl–KCl eutectic based on vertical substitution and relaxation
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-12
    Yu Zhang, Jia Song, Xuejiao Li, Liuming Yan, Shuping Shi, Tao Jiang, Shuming Peng

    The pyroprocessing technology of spent fuel is promise because of its advantages compared with the wet-processing technology; however, the development of pyroprocessing technology depends on the availability of basic physical chemistry properties for the relevant molten salt mixtures. In this work, the first principles molecular dynamics (FPMD) simulation is applied to the evaluation of redox potential of tetravalent actinides (Pa4+, U4+, and Np4+) in molten LiCl–KCl (ClLiK) eutectic. The reduction energetics, referenced to Th4+, is analyzed in terms of vertical substitution and relaxation, and satisfactory agreement is reached between our FPMD evaluations and experimental results reported in literatures.

    更新日期:2018-10-12
  • 更新日期:2018-10-12
  • MoS2 Nanosheets@N-carbon Microtubes: A Rational Design of Sheet-on-tube Architecture for Enhanced Lithium Storage Performances
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-12
    Tiantian Ma, Xianghong Liu, Li Sun, Yongshan Xu, Lingli Zheng, Jun Zhang
    更新日期:2018-10-12
  • Electroanalytical determination of caffeic acid – factors controlling the oxidation reaction in the case of PEDOT-modified electrodes
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-12
    V. Karabozhikova, V. Tsakova

    The present studies focus on the intrinsic role of poly(3,4-ethylenedioxythiophene) (PEDOT) in electrooxidation of caffeic acid (CA) in view of the application of this electrode material in electroanalytical sensing. Electrosynthesized PEDOT layers with different thickness and different doping counterions are investigated. Based on the scan rate dependence of the voltammetric peak currents it is found that depending on the thickness of the polymer layer different factors, i.e. adsorption for thin layers and diffusion for thick layers, are rate determining. In terms of electroanalytical characteristics it is established that adsorption control provides the opportunity to obtain higher electroanalytical sensitivity in a narrow concentration range of linear response. Diffusion control results in markedly lower sensitivity values but extended range of linearity in the concentration dependence. In the case of adsorption control a hyperbolic equation of the Langmuir/Michaelis–Menten type is suggested to model the experimentally obtained non-linear concentration dependence of the peak currents. The use of a non-linear calibration curve provides an extended concentration range for electroanalytical work under the established adsorption controlled conditions. Doping counterions (polysterene sulfonate and dodecyl sulfate) are found to have no effect on the electroanalytical performance of PEDOT for CA oxidation.

    更新日期:2018-10-12
  • Potato derived biomass porous carbon as anode for potassium ion batteries
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-10
    Wei Cao, Erjin Zhang, Jue Wang, Zhaomeng Liu, Junmin Ge, Xinzhi Yu, Hongguan Yang, Bingan Lu

    Biomaterials play a significant role in energy storage devices owing to their renewable, inexpensive and eco-friendly peculiarity. In this study, potato biomass porous carbon (PBPC), which was fabricated by a facile two-step carbonization, was used as the anode material for potassium-ion batteries (KIBs). The crystal structure and mesoporous morphology of the carbon derivative at various carbonation temperatures are fully investigated. The electrochemical performance of PBPC electrodes is evaluated, presenting a high reversible specific capacity (248 mA h g−1 at 100 mA g−1), an excellent rate performance (152 mA h g−1 at 1000 mA g−1) and a superior cycle stability (almost no capacity decay after 400 cycles at a current density of 500 mA g−1 with a Coulombic efficiency about 100%). The superior electrochemical performance is mainly attributed to the uniformly distributed mesopores on PBPC electrode which facilitate the electrolyte transportation and diffusion. This work provides a simple and novel strategy to construct porous carbon as high-performance anode materials for KIBs through a sustainable and environment-friendly way.

    更新日期:2018-10-11
  • Conditions for self-ordering of porous structure of anodic aluminum oxide in weak and strong acids
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-10
    R.A. Mirzoev, A.D. Davydov, S.I. Vystupov, T.B. Kabanova

    The model, which under certain assumptions enables one to predict the conditions for self-ordering of porous anodic oxide film (AOF) on aluminum in the weak and strong acids, is proposed. The work is a development of the theory of concentration changes in the growing oxide pores proposed by Patermarakis et al. The most important difference from the theory is the consideration of the second-stage dissociation of strong acids. The problem of the conditions of self-organization of porous AOF on aluminum is solved analytically. The critical porosity Ps and the corresponding anodizing voltage Vr that provides the optimal self-organization of porous structure of AOF are interpreted. Close values of Vr and the breakdown voltage VBP are explained. Using the model, the critical porosity Ps for solutions of weak monobasic acids and strong dibasic acids with low second-stage dissociation constant is calculated and the effect of various factors on the critical porosity Ps is determined. The obtained results give an answer to the question why all activating anions, which cause pitting dissolution, are the anions of strong monobasic acids.

    更新日期:2018-10-11
  • Ultra-dispersed island-like Co9S8 nanoparticles composed of nanosheets in-situ grown on nitrogen-doped graphene for asymmetric supercapacitor
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-10
    Xuezhao Wang, Dangcheng Su, Yuanhua Xiao, Shengang Xu, Shaoming Fang, Shaokui Cao
    更新日期:2018-10-11
  • Towards uniformly distributed heat, mass and charge: A flow field design study for high pressure and high current density operation of PEM electrolysis cells
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-11
    Anders Christian Olesen, Steffen Henrik Frensch, Søren Knudsen Kær

    In this work, a state-of-the-art, full-scale, Proton Exchange Membrane (PEM) electrolysis cell model is presented. The developed three-dimensional (3D) model accounts for compressible, two-phase flow including species, heat and charge transport in the anode and membrane. By incorporating electrochemistry as well as detailed heat and two-phase flow transport phenomena, the model is capable of studying cells at full-scale and for high current densities with high accuracy. To enable the modeling of thin catalyst layers (CL) for high current density operation in a 3D framework, the CL is modeled as an interfacial boundary.The necessary electrochemical parameters are obtained by fitting polarization curves of a two-dimensional version of the devised model to experimental measurements from a small cell. It is found that the obtained parameters are in agreement with literature values and that the fitted model is able to capture the performance for temperatures from 323 to 353 K and for current densities up to 5 A cm−2. Furthermore, it is identified that for high current density operation, three types of overpotential losses are nearly equally dominant: the anode kinetics, the PEM ohmic resistance and the non-membrane ohmic resistance due to poor electrical contact between layers and current constrictions in the CL.The developed 3D model is applied to three different circular, interdigitated anode flow fields aimed a high pressure and high current density operation. When operating the cell at a cathode pressure of 100 bar, a current density of 5 A cm−2 and stoichiometric constant of 350, it is found that the cell potential shows little dependence on the applied flow field. However, large in-plane variations can occur that may impact lifetime significantly. Particularly for the temperature field, an in-plane difference of up to 20.2 K relative to the intended cell temperature is found in the worst case. For all three cases, the occurrence of hot spots is linked to the maldistribution of two-phase flow and current density. Out of the studied cases, it was found that equal land width between the channels gives the best distribution of charge, mass and heat.

    更新日期:2018-10-11
  • Anchoring polysulfides in hierarchical porous carbon aerogel via electric-field-responsive switch for lithium sulfur battery
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-11
    Jingjian Yu, Xueliang Li, Yizhen Shu, Li Ma, Xingchi Zhang, Yunsheng Ding

    Lithium sulfur batteries have attracted significant attention owing to their remarkably high theoretical capacities and energy density for the potential next-generation energy storage system. Considerable efforts have been developed to improve the redox reversibility and suppress sulfur loss when maintaining their capacities. However, few strategies have enlightened to address shuttle issues via electric-field-responsive film. Here, we postulate a new strategy to create smart electric-field-responsive surface structure and design special molecular film with quaternary ammonium group. The responsive film bonded to carbon matrix can act as a switch to control the on-off of polysulfide channels. Meanwhile, the prepared carbon aerogel (CA) matrix presents highly cross-linked 3D framework, abundant hierarchical pore channels and high specific surface area. The results show the composite sulfur cathode with selective film exhibits outstanding high discharging capacities and long-term cycling stability. Specifically, the cathode with 61.6 wt% sulfur displays an initial specific capacity of 1307 mAh g-1 at 0.2 C and maintains 84.0% after 100 cycles. The improved electrochemical performance may mainly benefit from the switch function of self-responsive film, effectively preventing polysulfides escaping from the cathode, suppressing shuttle effect and enhancing the utilization of sulfur. Furthermore, the adsorption calculation by the density functional theory (DFT) shows trapping role of beta-cyclodextrin quaternary ammonium (CDQA) to polysulfides. The DFT simulation further supports the confining and switching mechanism.

    更新日期:2018-10-11
  • Influence of the pH on the electrochemical synthesis of polypyrrole nanotubes and the supercapacitive performance evaluation
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-11
    Bruna M. Hryniewicz, Renata V. Lima, Franciele Wolfart, Marcio Vidotti
    更新日期:2018-10-11
  • Reduced graphene oxide/polymer dots-based flexible symmetric supercapacitors delivering an output potential of 1.7 V with electrochemical charge injection
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-11
    Xiumei Guo, Baoxi Feng, Ligang Gai, Jianhua Zhou

    Electrochemical charge injection (ECI) is proved a powerful technique to maximize the available widen potential range of aqueous electrolyte. In this report, reduced graphene oxide/polymer dots (rGO/PDs) nanocomposites are prepared and tested as electrode materials for flexible supercapacitors. The weight ratio of GO/PDs plays an important role in the electrochemical performance of rGO/PDs nanocomposites. Through the ECI technique, a 1.7-V output potential can be delivered by rGO/PDs-based flexible supercapacitors operating with 1 mol L−1 Na2SO4 aqueous electrolyte. A specific energy of 7.1 W h kg−1 with corresponding specific power of 85 W kg−1 can be achieved for a typical flexible supercapacitor, which exhibits a capacitance retention of 90.6% after 5000 cycles at 0.5 A g−1.

    更新日期:2018-10-11
  • High quality perovskite film solar cell using methanol as additive with 19.5% power conversion efficiency
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-11
    Minghai Feng, Shuai You, Nian Cheng, Jianghui Du
    更新日期:2018-10-11
  • 更新日期:2018-10-10
  • PtRu alloy nanoparticles supported on nanoporous gold as an efficient anode catalyst for direct methanol fuel cell
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-09
    Miaomiao Tian, Shuai Shi, Yongli Shen, Huiming Yin

    An efficient and CO-tolerant anode catalyst for direct methanol fuel cell is fabricated by depositing PtRu alloy nanoparticles (∼3 nm) on nanoporous gold film (NPG-PtRu). Those catalysts with various Pt/Ru molar ratios are prepared by using linear scanning voltammetry and their electrocatalytic activities are measured for methanol oxidation reaction (MOR) and CO oxidation. Owing to the notably reduced CO adsorption energy, NPG-PtRu catalyst with Pt/Ru molar ratio of ∼2:1 exhibits close CO-tolerance but 3-fold enhanced MOR activity in contrast to commercial JM-PtRu/C, and thus is chosen as the anode in direct methanol fuel cell. The membrane electrode assembly with anode of NPG-PtRu (0.2 mgPt cm−2 and 0.3 mgAu cm−2) shows a maximum power density of 96 mW cm−2, about 6-fold enhancement of Pt efficiency than that of commercial PtRu/C (1 mgPt cm−2, 78 mW cm−2) under similar conditions.

    更新日期:2018-10-10
  • Fabrication of hierarchical NiCo2S4@CoS2 nanostructures on highly conductive flexible carbon cloth substrate as a hybrid electrode material for supercapacitors with enhanced electrochemical performance
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-10
    Mani Govindasamy, Selvaraj Shanthi, Elanthamilan Elaiyappillai, Sea-Fue Wang, Princy Merlin Johnson, Hiroya Ikeda, Yasuhiro Hayakawa, Suru Ponnusamy, Chellamuthu Muthamizhchelvan
    更新日期:2018-10-10
  • Relation between texture and high-rate capacitance of oppositely charged microporous carbons from biomass waste in acetonitrile-based supercapacitors
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-10
    Edurne Redondo, Julie Ségalini, Javier Carretero-González, Eider Goikolea, Roman Mysyk

    A biomass-derived activated carbon with a systematic control over the pore size distribution is used to decode the effect of pore size distribution on charge dynamics in organic acetonitirile-based supercapacitors. Distinct trends in the high-current capacitance of the positive and negative electrodes are revealed by isolating the ion-specific accessible pore width and specific surface area from the total values calculated on the basis of low-temperature nitrogen adsorption/desorption isotherms. A size match between ions and pores for each separate electrode is established to maximize gravimetric capacitance under high current load. Most importantly, the high-current gravimetric capacitance demonstrates the existence of an optimum micropore width depending on polarization as well as no need for wide micropores or mesopores for ensuring rapid capacitive response.

    更新日期:2018-10-10
  • Employing tetraethyl orthosilicate additive to enhance trap passivation of planar perovskite solar cells
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-08
    Mingjing Guan, Qianlong Zhang, Fei Wang, Hongyu Liu, Junyi Zhao, Chong Jia, Yiqing Chen

    In this work, trap passivation can be enhanced by introducing the controlled tetraethyl orthosilicate (TEOS) additive into the perovskite precursor. The effect of different concentrations of TEOS additive on interfacial modification and carrier recombination process has been investigated systematically. Silicon dioxide (SiO2), the product of TEOS additive, can precipitate at the grain boundary after the formation of perovskite film, resulting in trap passivation at perovskite interface. The recombination kinetics manifests that a small amount of TEOS additive can significantly prolong carrier lifetime, due to the reduction of trap-states in the perovskite interface, which are supposed to be the carrier recombination centers. Using a typical planar structure of the cells prepared under fully open air condition, the steady-state efficiency of our best-performing devices has improved from 15.96 to 18.38%.

    更新日期:2018-10-09
  • Au nanoparticle-decorated urchin-like TiO2 hierarchical microspheres for high performance dye-sensitized solar cells
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-08
    Yuan Li, Yusheng Zhou, Yong Wang, Ru Zhou, Qiang Ling, Haihong Niu, Wei Zhang, Chaoqun Wang, Jihong Qiu, Zhiqiang Guo, Jinzhang Xu

    Urchin-like TiO2 hierarchical microspheres (UTHMs) with an extremely large surface area of 331 m2 g−1 were synthesized via a facile one-pot hydrothermal method and studied for dye-sensitized solar cells (DSSCs) application. In-situ growth of Au nanoparticles (NPs) on the surface of the UTHMs were further conducted to achieve Au-decorated UTHMs (Au-UTHMs). A series of novel composite photoanode films were designed through the combined use of Au-UTHMs and UTHMs at different mass ratios. The DSSC constructed with the composite photoanode prepared under an optimal Au-UTHMs to UTHMs ratio of 2 wt% yields a considerable power conversion efficiency of 7.21%, which was markedly higher than that of the pure P25 NPs based device (5.19%) and pure UTHMs based device (6.10%). The significantly enhanced performance of the composite photoanode based DSSC can be attributed to the synergistic effect of two benefits: (1) the large specific surface area, strong light scattering and fast electron transfer channels arising from the novel hierarchical features of UTHMs, and (2) the enhanced light absorption owing to the localized surface plasmon resonance (LSPR) effect of Au NPs.

    更新日期:2018-10-09
  • Cu modified ZnO nanoflowers as photoanode material for highly efficient dye sensitized solar cells
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-08
    Shuxin Zhuang, Mi Lu, Nan Zhou, Litao Zhou, Daqin Lin, Zhengyu Peng, Qihui Wu
    更新日期:2018-10-09
  • Solid molybdenum nitride microdisc electrodes: Fabrication, characterisation, and application to the reduction of peroxodisulfate
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-08
    Saiful Arifin Bin Shafiee, Andrew L. Hector, Guy Denuault

    A new methodology was developed to fabricate solid molybdenum nitride microdisc electrodes for the first time. The MoN microrods were produced by heating Mo microwires in dry NH3 atmosphere for several hours. They were characterised by scanning electron microscopy (SEM), energy dispersive spectroscopy (EDS) and X-ray diffraction (XRD). The latter revealed the samples had crystallised in the δ3-MoN phase with a core of γ-Mo2N. Their electrochemical behaviour was probed for the reduction of Ru(NH3)63+. For this fast electron transfer the MoN microdisc electrodes returned similar voltammetric features to Pt microelectrodes. Their amperometric response was further tested with the reduction of peroxodisulfate. In contrast with other electrode materials, the reduction of S2O82− on MoN microdiscs delivered steady state voltammograms with well-defined diffusion controlled plateau. At low sweep rates, the limiting current was consistent with hemispherical diffusion and stable for at least 500 s. The diffusion coefficient of S2O82− derived from these results, 9.5 × 10−6 cm2 s−1, is in excellent agreement with previous work. At high sweep rates, the reduction of peroxodisulfate was found to be complicated by the simultaneous reduction of adsorbates. The results indicate that MoN is an ideal electrode material to monitor the concentration of peroxodisulfate under steady state conditions.

    更新日期:2018-10-09
  • Tuning the A-site cation and X-site anion composition of CH3NH3PbI3 perovskite material for efficient planar perovskite solar cells
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-08
    Yangyang Cai, Lai Xie, Zongbao Zhang, Yang Zhou, Hui Liu, Xubing Lu, Xingsen Gao, Jinwei Gao, Lingling Shu i, Sujuan Wu, Junming Liu

    In order to optimize microstructure and improve the photoelectric properties of planar perovskite solar cells (PSCs), the Cs+ and SCN− are selected to tune the A-site cation and X-site anion composition of CH3NH3PbI3 material with ABX3 structure, respectively. The effects of Cs+ and SCN− addition on the microstructure and photoelectric properties of (CH3NH3)0.9Cs0.1Pb(I1-xSCNx)3 perovskite films and the performance of PSCs have been systematically investigated. The value of “x” corresponding to the amount of SCN− has been optimized. At the optimum amount of 0.05, the (CH3NH3)0.9Cs0.1Pb(I0.95SCN0.05)3 (Cs0.1SCN0.05) PSC achieve the champion power conversion efficiency (PCE) of 18.78% and average PCE of 17.66%, being much higher than that of the reference PSCs. The results indicate that the obtained Cs0.1SCN0.05 perovskite film shows the improved microstructure, better local electric properties, the reduced trap density and suppressed charge recombination, resulting in the promoted carrier transfer and improved performance in PSCs.

    更新日期:2018-10-09
  • 更新日期:2018-10-09
  • Interface engineering with NiO nanocrystals for highly efficient and stable planar perovskite solar cells
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-09
    Weina Zhang, Xuezhen Zhang, Tongyue Wu, Weihai Sun, Jihuai Wu, Zhang Lan

    It is verified that the interface engineering is an effective way to achieve highly efficient and stable perovskite solar cells. However, the typical interface engineering of using insulating polymer or metal oxide to fabricate tunneling layers has an obvious drawback that is their thickness must be exactly controlled (usually <2 nm), thinner or thicker film will not bring positive effects on the photovoltaic performance of the device. Here we report the fabrication of efficient and stable planar perovskite solar cells by interface engineering with p-type NiO nanocrystals. It is found that the photovoltaic performance of the devices is not so sensitive to the thickness of NiO thin films. The champion planar perovskite solar cell with a NiO thin film in the interface of perovskite/spiro-OMeTAD can achieve a high efficiency of 19.89% and a high steady-state power output of 19.37 mW cm−2, being attributed to the significantly suppressed radiative recombination and eliminated charge accumulation. Moreover, the device shows excellent stability because its efficiency can retain 94.40% of the initial value after 400 h measurement in an air environment with 50 ± 5% relative humidity. Therefore, this work supplies an easy way to implement interface engineering for boosting both efficiency and stability of perovskite solar cells.

    更新日期:2018-10-09
  • Three-dimensional hierarchical ternary aerogels of ultrafine TiO2 nanoparticles@porous carbon nanofibers-reduced graphene oxide for high-performance lithium-ion capacitors
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-09
    Cheng Yang, Jin-Le Lan, Chenfeng Ding, Feng Wang, Sajid Hussain Siyal, Yunhua Yu, Xiaoping Yang

    A novel three-dimensional hierarchical ternary aerogel of TiO2 nanoparticles@porous carbon nanofibers-reduced graphene oxide (TiO2@PCNF-GA) was designed as an advanced anode for lithium-ion capacitors. TiO2@PCNFs were first fabricated by electrospinning assisted by carbonization and a post-etching process, and then assembled into reduced graphene oxide aerogels (GAs) to obtain the TiO2@PCNF-GAs. The uniform distribution of the ultrafine TiO2 nanoparticles in the PCNFs inhibits the aggregation of the TiO2 nanoparticles. Meanwhile, the interconnected three-dimensional network constructed from the TiO2@PCNFs and the GAs inhibits the aggregation of the TiO2@PCNFs. Moreover, the hierarchical porous structure of the TiO2@PCNF-GAs affords numerous Li-ion transport paths. Therefore, the lithium-ion capacitor composed of the TiO2@PCNF-GAs anode and an activated carbon cathode exhibits high energy density versus power density (79.7 Wh kg−1 versus 75 W kg−1, 15.0 Wh kg−1 versus 15 kW kg−1) with superior cycle stability (93.3% retention after 10000 cycles at 5.0 A g−1).

    更新日期:2018-10-09
  • Confined and covalent sulfur for stable room temperature potassium-sulfur battery
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-08
    Ruifang Ma, Ling Fan, Jue Wang, Bingan Lu
    更新日期:2018-10-08
  • Novel Electrochemical Sensor for Mononitrotoluenes using Silver Oxide Quantum Dots
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-08
    Gaurav Bhanjana, Ganga Ram Chaudhary, Neeraj Dilbaghi, Moondeep Chauhan, Ki-Hyun Kim, Sandeep Kumar

    Mononitrotoluenes (MNTs) can cause methemoglobinemia, liver/kidney damage, and skin/eye/throat irritation. Monitoring of MNTs in real and laboratory samples is necessary to maintain levels below permissible limits. Herein, silver oxide quantum dots (Ag2O QDs) were synthesized using a chemical method and were well characterized using transmission electron microscopy (TEM), Fourier-transform infrared (FTIR) spectroscopy, X-ray diffraction (XRD), and UV-visible spectroscopy. The characterized QDs were coated on a gold (Au) electrode using a binder (Nafion). This modified electrode was evaluated and standardized for redox-based sensing against 2-nitrotoluene. Cyclic voltammetry (CV) was optimized for electrochemical determination of 2-nitrotoluene. The effects of various factors like scan rate, solution pH, analyte concentration, and possible interferants were also evaluated for sensing performance of 2-nitrotoluene. The fabricated sensor displayed a high sensitivity of 100 µA cm-2ppm-1 with a limit of detection of 4.3 ppm and a linear range of 5 to 40 ppm. The proposed technique was reliable for monitoring real as well as laboratory samples of 2-nitrotoluene.

    更新日期:2018-10-08
  • Insights into Ni-Fe couple in perovskite electrocatalysts for highly efficient electrochemical oxygen evolution
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-08
    Liangqi Gui, Ziliang Huang, Geng Li, Qing Wang, Beibei He, Ling Zhao
    更新日期:2018-10-08
  • Studies on nano composites of SPEEK/ethylene glycol/cellulose nanocrystals as promising proton exchange membranes
    Electrochim. Acta (IF 5.116) Pub Date : 2018-10-08
    Saleheen Bano, Yuvraj S. Negi, Rajith Illathvalappil, Sreekumar Kurungot, K. Ramya
    更新日期:2018-10-08
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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