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    Simultaneous Determinations of Ascorbic Acid, Dopamine and Uric Acid at CA/GC Electrode
    ZHANG Ying, REN Wang, LI Min-Jiao
    Journal of Electrochemistry    2012, 18 (1): 79-83.  
    Abstract4727)      PDF(pc) (1854KB)(1696)       Save
    The citric acid modified glassy carbon electrode (CA/GC) was constructed by potentiostatic technique and used for simultaneous determinations of ascorbic acid (AA), dopamine (DA) and uric acid (UA) by cyclic voltammetry (CV) and differential pulse voltammetry (DPV). The CA/GC electrode exhibits excellent electrocatalytic activity towards AA, DA and UA. The oxidation peaks are well separated with the potential differences between AA and DA, DA and UA, and AA and UA being 170, 130 and 300 mV, respectively, which is large enough to determine AA, DA and UA simultaneously. The catalytic peak currents obtained were linearly dependent on the concentrations of AA, DA and UA in the range of 2.0×10-6~1.5×10-3 mol?L-1, 6.0×10-7~1.0×10-3 mol?L-1, and 6.0×10-7~1.0×10-3 mol?L-1, respectively. The proposed sensor shows good reproducibility and may be applied practically in the determinations of AA, DA and UA.
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    Cited: Baidu(45)
    Porous Electrodes with High Pt Utilization Obtained by Ion-Exchange/Electrodeposition
    CHEN Si-guo, DING Wei, QI Xue-qiang, LI Li, DENG Zi-hua, WEI Zi-dong*
    Journal of Electrochemistry    2013, 19 (1): 53-58.  
    Abstract2649)      PDF(pc) (52KB)(738)       Save
    We report a novel method based on ion-exchange/electrodeposition (IEE) for constructing high Pt utilization porous electrodes. The electrode prepared using IEE was assessed by linear sweep voltammetry (LSV), scanning electron microscopy (SEM), transmission electron microscopy (TEM) and single cell test. The preliminary results show that the undesired ion-exchange between Pt anion and surface functional group in carbon black can be eliminated through the electrode preparation process, and every Pt particle prepared by IEE is expected to be deposited on the three-phase reaction zone and thus can be fully utilized in fuel cell reactions. The Pt particle size, shape and distribution obtained by IEE can be controlled by modulating the IEE technique and cycles. The power output of the MEA employing a Pt/C electrode prepared by IEE with a Pt loading of 0.014 mgPt•cm -2 is equivalent to that employing a conventional Nafion-bonded Pt/C electrode with a Pt loading of 0.3 mgPt•cm -2.
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    Cited: Baidu(44)
    Progress and Perspective of Fuel Cell Technology
    HOU Ming, YI Bao-Lian
    Journal of Electrochemistry    2012, 18 (1): 1-13.  
    Abstract4804)      PDF(pc) (2923KB)(4396)       Save
    Fuel cell, a clean and high-efficiency electrochemical power source, has being paid much attention worldwide recent years. In this paper, the progress and perspective of fuel cell technology are elucidated in detail. Fuel cells have been applied in some special fields such as spacecraft, shuttle and submarines. However, in the areas of transportation, stationary station and portable power source, fuel cells are still under demonstration due to the durability and cost problems. The reliability and surrounding survivability of fuel cells should be enhanced in the special application. Meanwhile, the durability and cost of fuel cells are the main issues to be solved in the civil application. Fuel cell technologies need to be improved from three aspect innovations of key materials, components and system in order to realize fuel cell commercialization.
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    Cited: Baidu(34)
    Electrodeposition of Copper from a Choline Chloride based Ionic Liquid
    M. Rostom Ali*, Md. Ziaur Rahman, S. SankarSaha
    Journal of Electrochemistry    2014, 20 (2): 139-145.   DOI: 10.13208/j.electrochem.130714
    Abstract2471)      PDF(pc) (5000KB)(1293)       Save
    The electrodeposition of copper from a solution containing copper chloride in either an ethylene glycol (EG)-choline chloride based or a urea-choline chloride based ionic liquid has been carried out onto a steel cathode by constant current and constant potential methods at room temperature. The influences of various experimental conditions on electrodeposition and the morphology of the deposited layers have been investigated by scanning electron microscopy (SEM) and X-ray diffraction (XRD). It is shown that very smooth, shiny and dense with good adherence and bright metallic coloured copper coatings can be obtained from both EG and urea based ionic liquids at the applied deposition potentials up to -0.45 V and applied deposition current densities up to -4.0 A·m -2 at room temperature. The cathodic current efficiency for the deposition of copper is about 97%.
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    Cited: Baidu(33)
    Recent Progresses in Molybdenum-Based Electrocatalysts for the Hydrogen Evolution Reaction
    WU Ze-xing, Wang Jie, Guo Jun-po, Zhu Jing, Wang De-li
    Journal of Electrochemistry    2016, 22 (2): 192-204.   DOI: 10.13208/j.electrochem.151143
    Abstract987)      PDF(pc) (4592KB)(1460)       Save

    Electrochemical catalytic production of hydrogen has been considered as a promising and sustainable strategy for clean and renewable energy technologies. Molybdenum-based non noble metal catalysts for the hydrogen evolution reaction have attracted extensive attention due to its effective catalytic performance. In this review, the recent progresses in molybdenum-carbide, phosphide, nitride and sulfide electrocatalysts are presented. In addition, the strategies to improve the catalytic performance are analyzed and the prospects for the future development trends are expected.

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    Cited: Baidu(20)
    Application of Synchrotron Radiation Based Electrochemical In-Situ Techniques to Study of Electrode Materials for Lithium-Ion Batteries
    GONG Zheng-liang, ZHANG Wei, LV Dong-ping,HAO Xiao-gang, WEN Wen, JIANG Zheng, YANG Yong
    Journal of Electrochemistry    2013, 19 (6): 512-522.   DOI: 10.13208/j.electrochem.130361
    Abstract5596)      PDF(pc) (5324KB)(19979)       Save
    Due to its merits of high brightness and high intensity, high level of polarization and wide tunability in energy, etc., synchrotron radiation technique provides an unique platform for analysis of the relationship among composition–structure–performance of materials for lithium ion batteries, especially for in-situ, real time dynamic investigation of the electrochemical reaction mechanism, aging process and failure mechanism during charge-discharge cycling. In this paper, we review the latest developments in application of synchrotron based electrochemical in-situ experimental methods to studies of lithium ion batteries. The paper mainly focuses on the application of electrochemical in-siu XRD and XAFS techniques to the investigations of material structure evolution, charge compensation mechanism and reaction kinetics of batteries during charge-discharge cycling.
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    Cited: Baidu(20)
    An Investigation on the Solid Electrolyte Interphase of Silicon Anode for Li-Ion Batteries through Force Curve Method
    ZHENG Jie-yun, ZHENG Hao, WANG Rui, LI Hong*, CHEN Li-quan
    Journal of Electrochemistry    2013, 19 (6): 530-536.   DOI: 10.13208/j.electrochem.130357
    Abstract3613)      PDF(pc) (4358KB)(1186)       Save
    Non-aqueous electrolyte has been widely used in commercial Li-ion batteries. Optimized choices are proceeding among the various types of salts and solvents in an effort to achieve higher performance of electrolyte. However, the electrolyte will be reduced in low potential and the reductive product will be deposited on the surface of anode to form a passivating layer, solid electrolyte interphase (SEI). Herein an atomic force microscopy (AFM) based method was introduced to study the structure and mechanical property of SEI on silicon thin film anode during the first cycle. Silicon has been known as the most potential candidate anode for next generation of Li-ion batteries. However, large volume change and unstable SEI formation during cycling are needed to be resolved before practical application. In this study, the electrolyte was 1 mol·L-1 LiPF6 (EC:DMC=1:1) containing 2% vinylene carbonate. Layered-structures such as single layer, double layers and triple layers of SEI were detected, and the Young’s Modulus of the SEI was extracted from the force curves. Coverage of SEI was also obtained. A 3-D plot was introduced to real space mapping the formation of SEI on silicon anode at different cycle states.
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    Cited: Baidu(17)
    Electrochemical Performance of Si-C Composites Prepared by Discharge-Plasma Assisted Milling
    CHEN Yu-long, HU Ren-zong, LIU Hui, SUN Wei, ZHU Min*
    Journal of Electrochemistry    2014, 20 (1): 51-55.   DOI: 10.13208/j.electrochem.130227
    Abstract2929)      PDF(pc) (5034KB)(1366)       Save
    Silicon-carbon (Si-C) composites, with microstructure of multi-scaled Si particles being homogenously dispersed in micro-sized carbon matrix, had been prepared by dielectric barrier discharge plasma assisted two-step milling for the first time. The Si-C composite anode had a discharge capacity of 1259 mAh·g -1 at the first cycle, while the capacity retained 474 and 396 mAh·g -1 after 20 and 100 cycles, respectively. Charge-discharge curves and AC impedance response indicated that both silicon and carbon phases in the composite anode were involved during the lithiation/delithiation reactions and the electron transport resistance in the Si-C composite anode was much lower than that in the pure Si anode.
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    Cited: Baidu(14)
    Electrochemical Behavior of Ionic Liquid Confined into Nanopores of Silica Gel Matrix
    LI Zuo-peng, WEN Ya-qiong, WU Mei-xia, GUO Yong*
    Journal of Electrochemistry    2014, 20 (2): 121-127.   DOI: 10.13208/j.electrochem.130301
    Abstract2258)      PDF(pc) (990KB)(887)       Save
    Imidazolium Ionic liquids (ILs) nano aggregates confined into nanopores of silica gel matrices (ILs-sg) modified electrodes were prepared by sol-gel process and characterized by cyclic voltammetry. Furthermore, the amounts of 15% ~ 28% ILs-sg and nano aggregates coated with ILs silica gel (ILs/sg) were prepared and their conductivities were evaluated by performing electrochemical AC impedance measurements from 20 oC to 80 oC. The abnormal results showed that, 1) comparing with the bulk IL, the confined IL had a positive shift effect of Fc/Fc+ redox potential; 2) when IL confined into a nanospace, the electrochemical stability became poor; 3) the ion conductivity of ILs-sg was 29.6% ~ 136% higher than that of ILs coated silica gel, which could be attributed to the formation of nano ionic liquid network electrolyte. These results not only illustrate that the ILs based silica gel could serve as an excellent support of modified electrode for electrochemical active substance, but also reveal that the findings are helpful to understand the electrochemical phenomena of ILs under a confinement environment.
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    Cited: Baidu(13)
    Novel Electrochemical Interfaces Based on Functional Nanomaterials and Their Related Applications
    ZHU Cheng-zhou, HAN Lei, DONG Shao-jun*
    Journal of Electrochemistry    2014, 20 (3): 219-233.   DOI: 10.13208/j.electrochem.130884
    Abstract2825)      PDF(pc) (1427KB)(1232)       Save
    Due to the unique optical, electronic, magnetic and catalytic properties, functional nanomaterials provide new opportunities for the rapid development in a variety of disciplines and show considerable promise in different fields. Specifically, constructions of the novel electrochemical interface using various nanomaterials and exploring their advanced electrochemical properties have received great attention to develop electrochemical devices with potential applications. In this account, we focus on our up-to-date progress in the construction of novel electrochemical interfaces based on nanomaterials, mainly highlighting our research advances on electrochemical sensors, fuel cells and fluorescence spectroelectrochemistry. These novel advanced nanomaterials endow them excellent performances and open the door towards the development of new generation of electrochemical nanodevices. The introduction of them is beneficial to accelerating electron transfer and improving their electrocatalytic efficiency in the field of electrochemical sensors and fuel cells. Searching for and synthesizing proper luminescence materials and electrochromic species with excellent spectrum matching were designed to fabricate novel electroswitching fluorescence nanodevices. In addition, the optimization of the fabrication for multiple stimuli-responsive systems and the realization of their multifunctions were further explored. Finally, future challenges and perspectives toward these research fields mentioned above are described.
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    Cited: Baidu(13)
    Corrosion Behavior of a High Strength Low Alloy Steel Under Hydrostatic Pressure in Deep Ocean
    SUN Hai-jing, LIU Li, LI Ying*
    Journal of Electrochemistry    2013, 19 (5): 418-424.  
    Abstract1850)      PDF(pc) (4282KB)(1351)       Save
    The corrosion behavior of a high strength low alloy steel (HSLA steel) in 3.5% NaCl solution under hydrostatic pressure (HP) in deep ocean has been investigated by performing weight loss measurement, obtaining potentiodynamic polarization curve and emplying electrochemical impedance spectroscopy (EIS) using the set up for simulation of deep sea environment in laboratory. The results were compared with that at atmospheric pressure and the influence of HP was emphatically discussed. The results revealed identical corrosion mechanism for HSLA steel at 3.5 × 106 Pa and 1 × 105 Pa. Howevere, the development of such a corrosion process was remarkably accelerated at HP. In addition, the cathodic process of HSLA steel was little influenced at HP, while the anodic dissolution process became faster partly attributed to the enhanced activity of Cl- ions.
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    Cited: Baidu(13)
    Electrochemical Applications of Single-walled Carbon Nanohorns
    LI Su-ping,GUAN Huai-min, ZHU Shu-yun, GILANI Muhammad Rehan Hassan Shah, HANIF Saima, XU Guo-bao*, TONG Yue-jin*
    Journal of Electrochemistry    2014, 20 (6): 501-505.   DOI: 10.13208/j.electrochem.140433
    Abstract1699)      PDF(pc) (535KB)(951)       Save
    Single-wall carbon nanohorns (SWCNHs) have unique properties, such as a large specific surface area, good electrical conductivity and biocompatibility. It has been widely utilized in many fields. In the present review, the progress in electrochemistry study of SWCNHs has been summarized and the future research trends have been proposed.
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    Cited: Baidu(11)
    Multifunctional Corrosion Inhibition Behavior of Zn-Al Calcined Layered Double Hydroxides for Steel Rebar in NaCl Solution
    ZHANG Xiao-Juan, WANG Jing-Jing, DONG Shi-Gang, LIN Chang-Jian
    Journal of Electrochemistry    2013, 19 (3): 256-265.  
    Abstract2250)            Save
    The Zn-Al layered double hydroxides (Zn-Al LDHs) and calcined products (Zn-Al CLDHs) were synthesized successfully under a routine air atmosphere. The results showed that both Zn-Al LDHs and Zn-Al CLDHs had obvious flake structures. The corrosion inhibition of Zn-Al CLDHs for steel rebar in NaCl solution was studied by electrochemical techniques. It was found that the corrosion rate of steel rebar decreased significantly after the steel rebar was treated by Zn-Al CLDHs in NaCl solution for 3 h. It was indicated that Zn-Al CLDHs could absorb Cl - and release OH - during their reconstruction process, which provided dual protection for the steel rebar.
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    Cited: Baidu(11)
    Electrocatalytic Activity of Palladium Nanocatalysts Supported on Carbon Nanoparticles in Formic Acid Oxidation
    Jie Huang, Zhiyou Zhou, Yang Song, Xiongwu Kang, Ke Liu, Wancheng Zhou, Shaowei Chen*
    Journal of Electrochemistry    2012, 18 (5、6): 508-514.  
    Abstract2969)      PDF(pc) (2801KB)(1225)       Save
    Palladium nanostructures were deposited onto carbon nanoparticle surface by a chemical reduction method. Transmission electron microscopic studies showed that whereas the resulting metal-carbon (Pd-CNP) nanocomposites exhibited a diameter of 20 to 30 nm, the metal components actually showed a cauliflower-like surface morphology that consisted of numerous smaller Pd nanoparticles (3 to 8 nm). Electrochemical studies showed that the effective surface area of the Pd-CNP nanoparticles was about 40% less than that of Pd black, possibly because the Pd nanoparticles were coated with a layer of carbon nanoparticles; yet, the Pd-CNP nanocomposites exhibited marked enhancement of the electrocatalytic activity in formic acid oxidation, as compared to that of Pd black. In fact, the mass- and surface-specific activities of the former were about three times higher than those of the latter. This improvement was likely a result of the enhanced accessibility of the Pd catalyst surface and the formation of abundant active sites of Pd on the carbon nanoparticle surface due to the hierarchical structure of the metal nanocatalysts.
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    Cited: Baidu(10)
    Dissolved Oxygen Seawater Battery with Electrochemical Capacitance
    XU Hai-Bo, LU Yong-Hong, ZHANG Wei, YU Yan-Ting, YAN Chuan-Wei, SUN Ya-Ping, ZHONG Lian, LIU Jian-Guo, ZHENG Yi, HAN Bing, WANG Yong-Liang
    Journal of Electrochemistry    2012, 18 (1): 24-30.  
    Abstract3932)      PDF(pc) (2708KB)(2191)       Save
    A new concept of seawater battery with electrochemical capacitance (SWB-EC) has been proposed using carbon fibre brush (CFB) as the cathode material, and three testing prototypes have been made accordingly. The discharge performances of the CFB before- and after-oxidation and Mg alloy sacrifice anode were studied by cyclic voltammetry and constant current discharge tests under steady state conditions. Results show that the oxidized CFB exhibits the pseudo-capacitive characteristic and its activity of oxygen reduction reaction (ORR) in stirred seawater highly increases, comparing with the non-oxidized CFB. The open circuit potential of Mg alloy sacrifice anode is -1.74 V, having the advantages of high working potential and uniform dissolution. The consecutive marine discharge test is conducted for prototypes made of the oxidized CFB cathode and Mg alloy sacrifice anode. The preliminary data collected in two months reveals that comparing with the commercial seawater battery—SWB1200, the home-made SWB-EC achieves a higher volume specific power density.
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    Cited: Baidu(10)
    Electrochemical Performances of Layered Polypyrrole/Chemically Reduced Graphene Oxide Nanocomposites as Supercapacitor Electrodes
    XU Si-Zhe, ZHOU Xue-Jiao, WU Kun, YANG Yong-Qiang, WU Hai-Xia
    Journal of Electrochemistry    2012, 18 (4): 348-358.  
    Abstract4258)      PDF(pc) (4495KB)(1354)       Save
    Nanocomposites of polypyrrole (Ppy) and chemically reduced graphene oxide (CRGO), Ppy/CRGO, have been fabricated through in-situ polymerization of pyrrole on graphene oxide (GO) sheets. The as-synthesized Ppy/CRGO composites were characterized complementarily using scanning electron microscopy (SEM), thermogravimetric analysis (TGA), and Fourier transformed infrared spectroscopy (FT-IR). By controlling the initial ratio of the GO to pyrrole, the layered composites could be obtained and their thickness could be tuned properly. The Ppy/CRGO electrodes were prepared using a mechanical compressing technique and their electrical conductivity and electrochemical properties were characterized systematically. We demonstrated that as electrodes for supercapacitor, the Ppy/CRGO composites with Ppy to CRGO ratio of 10:1 showed a competitive capacitance of 421 F?g-1 that could be further increased to 509 F?g-1 by introducing pores in it, which is higher than that of Ppy alone. Given the manifest electrical and electrochemical properties, we envisage that the Ppy/CRGO composites should find applications in supercapacitors.
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    Cited: Baidu(10)
    Effects of Carbon Interlayer on Electrochemical Performance of Lithium-Sulfur Cell
    YU Jin-peng, ZHANG Ming, DING Fei, TANG Zhi-yuan, LIU Xing-jiang*
    Journal of Electrochemistry    2014, 20 (2): 105-109.   DOI: 10.13208/j.electrochem.130427
    Abstract2556)      PDF(pc) (3274KB)(996)       Save
    Three kinds of conductive carbon films were prepared with Super-P (SP), KB and MWCNTs, and then the as-prepared carbon films were applied as an interlayer between a sulfur electrode and a separator for constructing a coin-type lithium-sulfur (Li-S) cell, respectively. The assessment results show that all the cells delivered the reversible capacities higher than 800 mAh·g -1 after 40 cycles when the sulfur loading was up to 80% (by mass) in the sulfur electrode. Due to significant differences of physical properties among the carbon materials,the cell with a KB interlayer exhibited higher electrochemical polarization; the cycling performance of the cell with a SP interlayer was poorer than that of the other cells, although the discharge capacity was the highest in the initial cycles; MWCNTs film was the best choice as an interlayer in the Li-S cells.
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    Cited: Baidu(10)
    Latest Progresses in Vanadium Flow Battery Technologies and Applications
    WANG Xiao-li, ZHANG Yu, ZHANG Hua-min
    Journal of Electrochemistry    2015, 21 (5): 433-440.   DOI: 10.13208/j.electrochem.150747
    Abstract796)      PDF(pc) (7335KB)(576)       Save

    With virtues of high safety, long cycle life, friend environment and state of charge easy monitoring, vanadium flow battery has become an effective technique for large scale energy storage. United States, Japan, Europe and other developed countries are actively promoting the developments of vanadium flow battery technology and related equipments. In this paper, the performance of containerized vanadium flow battery, which was newly developed by Rongke Power (RKP) and Dalian Institute of Chemical Physics, was introduced. The operation data of 5 MW/10 MWh vanadium flow battery energy storage station was displayed. Finally, it is pointed out that reducing the cost, improving the durability and reliability are the key issues to achieve the commercialization of energy storage.

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    Cited: Baidu(10)
    Fabrication and Electrochemical Properties of Graphene-ZnO Nanocomposite
    MEN Chuan-ling*, WANG Wan, CAO Jun
    Journal of Electrochemistry    2014, 20 (2): 189-193.   DOI: 10.13208/j.electrochem.130724
    Abstract2734)      PDF(pc) (1819KB)(1768)       Save
    In this work, the graphene-ZnO nanocomposite was successfully synthesized through a one-step solvothermal approach, using ethylene glycol as the solvent and reducing agent. The ZnO particles could be attached to the surfaces and edges of graphene sheet. The electrochemical performance of the nanocomposite was investigated by performing cyclic voltammetry, A.C. impedance and chronopotentiometry tests in 6 mol·L -1 KOH. The results showed that the graphene-ZnO nanocomposite exhibited a nice electrochemical specific capacitance of 115 F·g -1 determined in cyclic voltammetry test, or 71 F·g -1 evaluated in chronopotentiometry test and good reversible charge/discharge behavior.
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    Cited: Baidu(9)
    Graphene Quantum Dots Enhanced Electrochemical Performance of Polypyrrole as Supercapacitor Electrode
    WU Kun,XU Si-zhe, ZHOU Xue-jiao, WU Hai-xia*
    Journal of Electrochemistry    2013, 19 (4): 361-370.  
    Abstract3884)      PDF(pc) (2269KB)(1846)       Save
    With an objective to develop electrode materials with high specific capacitance and good stability, a completely new nanocomposite of Polypyrrole (PPY) and graphene quantum dots (GQD) was successfully obtained through in-situ polymerization of pyrrole in the presence of GQD suspension. The obtained composites with different mass ratios were characterized by X-Ray diffraction (XRD), Fourier transformed infrared spectroscopy (FT-IR) and scanning electron microscopy (SEM). GQD enhanced electrochemical performance of PPY and, as supercapacitor electrodes, the PPY/GQD composites with the mass ratio of PPY to GQD at 50:1 showed a competitive specific capacitance of 485 F·g -1 at a scan rate of 0.005 V·s -1. The attenuation of the specific capacitance is about 2% after 2000 cycles. The high specific capacitance and good stability of the PPY/GQD nanocomposites are promising for applications in electrochemical supercapacitors.
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    Cited: Baidu(9)
    Preparation and Characterization of a Novel Composite Electrolyte Ceria-Sulfate for Intermediate Temperature Solid Oxide Fuel Cells
    TONG Ze, YIN Yi-Mei, YIN Jie-Wei, MA Zi-Feng
    Journal of Electrochemistry    2013, 19 (3): 210-214.  
    Abstract1783)      PDF(pc) (4820KB)(1357)       Save
    A novel composite electrolyte SDC-(Li/Na) 2SO 4 was prepared for intermediate temperature solid oxide fuel cells (ITSOFC). The phase structure and cross-sectional morphology were examined by XRD and SEM, respectively, and the ionic conductivity was investigated by AC impedance in a temperature range of 400 oC ~ 700 oC in air. It was found that the composite electrolyte was composed of two phases: crystal SDC and amorphous (Li/Na) 2SO 4. The conductivity of the composite electrolyte was significantly larger than that of SDC at intermediate temperatures (550 oC ~ 700 oC) and increased with temperature in three stages: 1) T<500 oC, the apparent activation energy of ionic transport was 1.28 eV; 2) In the range of 500 oC ~ 550 oC, the ionic conductivity rapidly increased due to the melting of sulfate; 3) T>550 oC, the conductivity slowly raised with temperature, the activation energy decreased significantly to 0.30 eV, and the values of the conductivity of SDC-(Li/Na) 2SO 4 were notabily higher than those of SDC and previously reported SDC-(Li/Na) 2CO 3. For example, the conductivity of SDC-(Li/Na) 2SO 4 was 0.217 S·cm -1 at 550 oC, which was 25 times higher than that of SDC and 3.2 times higher than that of SDC-(Li/Na) 2CO 3. The results indicate that the ionic conducting mechanism changes in composite electrolyte due to the melting of the sulfate second phase, and the diffusion and transmission of ions are accelerated.
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    Cited: Baidu(9)
    Electrocatalytic Mechanism and Porous Electrode Mass Transfer Process in Membrane Electrode Assembly for Direct Methanol Fuel Cells
    WANG Xin-Dong, WANG Yi-Tuo, LIU Gui-Cheng, WANG Meng, TIAN Zhe
    Journal of Electrochemistry    2013, 19 (3): 246-255.  
    Abstract2361)      PDF(pc) (13102KB)(1065)       Save
    Direct methanol fuel cell (DMFC) is considered to be a promising commercial energy conversion device for portable electronics due to its many advantages. In order to improve the performance of DMFC, many companies and research institutes have been launching the deep research and obtaining a lot of conspicuous achievements. In this paper, the electrocatalytic mechanism and porous electrode mass transfer process in membrane electrode assembly (MEA) are analyzed. In addition, combined with the preparation process of MEA, multilayer ordered structures and internal transfer process of the cell, recent progresses of MEA in DMFC are discussed.
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    Cited: Baidu(8)
    Advances and Challenges of Intermediate Temperature Solid Oxide Fuel Cells: A Concise Review
    Sanping Jiang
    Journal of Electrochemistry    2012, 18 (5、6): 479-495.  
    Abstract3904)      PDF(pc) (5914KB)(2757)       Save
    Fuel cell is an electrochemical energy conversion device to directly convert the chemical energy of fuels to electricity. Among all types of fuel cells, solid oxide fuel cells (SOFCs) operating at intermediate temperatures of 600~800 oC offer an attractive option that is much more fuel flexible than low temperature fuel cells such as proton exchange membrane fuel cells, and is suitable for a wide range of applications. However, two main challenges remain towards the commercial viability and acceptance of the SOFC technologies: the cost and durability. Both are critically dependent on the process, fabrication, performance, chemical and microstructural stability of various cell components, including anode, cathode, electrolyte, interconnect, and seal. Manifold and balance of plant materials also need to be carefully selected to ensure the structural stability and integrity with minimum volatile species. This article aims at providing a concise review and outlook of materials and components that have studied for SOFCs. The opportunities and challenges for the new generation of SOFCs technologies are briefly discussed.
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    Cited: Baidu(8)
    Catalytic Activities of Electrochemically Dealloyed Pt(Pd)-Cu Catalysts for Oxygen Reduction Reaction
    YANG Rui-Zhi, Peter Strasser, Michael Toney
    Journal of Electrochemistry    2012, 18 (2): 141-146.  
    Abstract4447)      PDF(pc) (1102KB)(1177)       Save
    The electrochemically dealloyed Pt(Pd)-Cu catalysts were prepared by electrochemical dealloying of Cu3Pt(Pd) and their catalytic activities toward oxygen reduction reaction (ORR) were studied in 0.1 mol?L-1 HClO4 . solutions. The structural features of the dealloyed Pt(Pd)-Cu were revealed by synchrotron-based anomalous X-ray diffraction (AXRD) and surface X-ray scattering (SXS) at an atomic scale. We established a relationship between the structure and the catalytic activity by comparing the ORR activity and the structure of dealloyed Cu3Pt nanoparticles with similarly dealloyed Cu3Pt thin films and Cu3Pt(111). The enhancement in the activity of the dealloyed Pt(Pd)-Cu is mainly attributed to the strain change in the Pt(Pd) overlayer formed on the surface after dealloying. The strain is related to the thickness of Pt(Pd) overlayer, which is affected by the size of the material and the diffusion coefficient of the constituent element. The catalytic activity for ORR can be tuned by the strain in the surface layer of a catalyst.
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    Cited: Baidu(8)
    Electrochemical Behavior of Imidacloprid
    WANG Jie-Qiong, ZHANG Wang, CHEN Ming, DIAO Guo-Wang
    Journal of Electrochemistry    2012, 18 (1): 68-72.  
    Abstract3352)      PDF(pc) (1796KB)(1466)       Save
    The electrochemical behavior of imidacloprid(IDP)on glassy carbon electrode has been investigated by cyclic voltammetry. The result shows that the electrochemical reduction of IDP is irreversible and controlled by diffusion. At 25 ℃, the numbers of the electrons transferred of IDP in the electrochemical reaction are four. The diffusion coefficient of IDP is 2.44×10?6 cm2?s?1 and the diffusion activation energy is calculated to be 9.33 kJ?mol-1.
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    Cited: Baidu(8)
    Key Factors and Techno-Economic Analyses of Manganese Electrolysis Process
    HAN Gui-mei, XU Fu-yuan*, JIANG Lin-hua, DAN Zhi-gang, GAO Xiao-juan, DUAN Ning
    Journal of Electrochemistry    2014, 20 (3): 282-287.   DOI: 10.13208/j.electrochem.130903
    Abstract1935)      PDF(pc) (828KB)(1045)       Save
    This paper first studied the key factors affecting the initial manganese electrolysis process, including concentration of Mn 2+, electrolysis time, overpotential, and then optimized these processing parameters with the chronocoulometry method under a three-electrode system. The results showed that, during the initial manganese electrolysis process, hydrogen evolution occurred more significantly on the stainless steel surface. As electrolysis process continued, manganese covered the stainless steel surface gradually, and hydrogen evolution reaction restrained which all contributed to the higher current efficiency. Besides, the limiting current density appeared at high overpotential region, and the reaction was controlled by diffusion process. In 0.02 g·L -1 SeO 2 solution system with 40 g·L -1 Mn 2+ and 120 g·L -1 (NH 4) 2SO 4, electrolysis time of 0.5 h overpotential of 0.151 V, bath temperature of 40 oC, pH of 6.6, the current efficiency was achieved as high as 95.3%. And an efficiency of 81.4% was also realized in the industrialized electrolyte system, which was 15% higher as compared to the previous operation parameters under the same electrolyte system.
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    Cited: Baidu(8)
    Synthesis of Platinum Nanocrystallites and Possible Electrocatalytic Properties for Methanol
    LU Lei-lei*, DU Bao-zhong, SUN Sha, NIU Jin-fen, ZHAO Jie
    Journal of Electrochemistry    2014, 20 (2): 171-176.   DOI: 10.13208/j.electrochem.130710
    Abstract2234)      PDF(pc) (2884KB)(666)       Save
    Platinum nanocrystallites were synthesized by the colloidal method using oxamide as the stabilizer. The morphologies and electrocatalytic performances for methanol of platinum nanocrystallites prepared at different pH values and with different reactant ratios of precursor and stabilizer were investigated. It was found that the platinum nanocrystallites synthesized at pH=5 and with the reactant ratio of 1:20 showed the best electrocatalytic activity for methanol. The peak current density reached up to 1709 μA·cm -2. Furthermore, the electrocatalytic activity of platinum nanocrystallites for methanol reduced significantly although the cyclic voltammograms in the blank solution were not obviously changed after exposing in air for 3 months. However, the curves changed significantly after sweeping for 100 cycles in the potential region of 0.05 ~ 1.2 V, indicating that the atomic arrangement of crystal surface had been changed. The easily poisoned (100) surface was gradually transformed to the more active (110) surface, resulting in the increase of electrocatalytic activity for methanol.
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    Cited: Baidu(8)
    Preparation of a New Laccase Biosensor based on Bimetallic Pt/Au Particles and Chitosan/silica sol-gel Hybrid Films for Determination of Catechol
    LOU Tong-fang, QU Jian-ying*, XING Huan-huan, DU Xue-ping, DONG Ying
    Journal of Electrochemistry    2014, 20 (2): 177-183.   DOI: 10.13208/j.electrochem.130809
    Abstract2425)      PDF(pc) (5041KB)(830)       Save
    A novel laccase (Lac) biosensor was fabricated successfully by means of entrapping Lac into bimetallic Pt/Au particles and chitosan/silica (CS-SiO2) sol-gel hybrid films, and then applied to determine catechol (CC) concentration. The experiment results showed that the biosensor can electrocatalyze the reduction of CC, and the peak current increased linearly with the concentration of CC in the range of 8×10 -7 ~ 1×10 -4 mol·L -1 (r = 0.9993) with a detection limit of 7.9×10 -8 mol·L -1 by cyclic voltammetric response. The biosensor exhibited good sensitivity, stability and reproducibility, with a broad linear range for potential applications.
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    Cited: Baidu(7)
    Preliminary Study on Morphology Controllability of Electrochemically Prepared Polyaniline by Using Aniline Aimer
    ZUO Yang, SHI Kang*
    Journal of Electrochemistry    2014, 20 (1): 17-21.   DOI: 10.13208/j.electrochem.121112
    Abstract2427)      PDF(pc) (2470KB)(1015)       Save
    Employing of aniline dimer (N-phenyl-p-phenylenediamine, NPD) as the starting monomer, polyaniline was electrochemically synthesized on the surface of glassy carbon electrode in acetonitrile-aqueous mixing solutions(20% by volume)containing 1 mol·L -1 HClO 4. Experimental results demonstrated that the polymerization of NPD occurs at the potentials about 0.2 V lower than those of aniline monomer. Furthermore, the resulting polyaniline has higher morphology controllability than those synthesized by using aniline as the stating monomer. The uniform polyaniline nanoparticles (30 nm in diameter), ultralong nanowires (length > 5 μm, 50 nm in diameter) or large area nanosheets (4 μm in length, 2 μm in height, 30 nm in thickness) can be prepared by using step-wise galvanostatic method when the concentrations of NPD monomer was 1, 5 or 10 mmol·L -1, respectively.
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    Cited: Baidu(7)
    Cyclic Voltammetric Studies in Adsorption of Cetyltrimethylammonium Bromide (CTAB) on Au(111) Electrode
    CHEN Ling, XU Chang-deng, YE Jin-yu, ZHEN Chun-hua, SUN Shi-gang*
    Journal of Electrochemistry    2014, 20 (4): 302-306.   DOI: 10.13208/j.electrochem.130890
    Abstract1922)      PDF(pc) (633KB)(729)       Save
    Adsorption of cetyltrimethylammonium bromide (CTAB) on Au(111) electrode was investigated by cyclic voltammetry (CV). The results demonstrate that the adsorption of CTAB on Au(111) yields particular CV features. Both the adsorption of CTA + and the phase change of the surfactant film are surface structure selective. Two pairs of stable sharp peaks that depend on halide species appear upon the adsorption of cationic surfactant on Au(111) electrode. The relationship between the peak current density and the scan rate indicates that the electron transfer reaction was controlled by diffusion process. These CV features are observed for the first time, and reflect the specific interaction between CTAB and Au(111). The results are of significance in understanding the interaction of CTAB with Au surface for shape-control synthesis of Au nanoparticles.
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    Cited: Baidu(7)