| Study of the electrochemical properties of a transition metallic ions modified electrode in acidic VOSO4 solution |
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| 引用本文： | WANG Wenhong WANG Xindong. Study of the electrochemical properties of a transition metallic ions modified electrode in acidic VOSO4 solution[J]. 稀有金属(英文版), 2007, 26(2): 131-135. DOI: 10.1016/S1001-0521(07)60172-7 |
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| 作者姓名： | WANG Wenhong WANG Xindong |
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| 作者单位： | Metallurgical and Ecological Engineering School, University of Science and Technology Beijing, Beijing 100083, China |
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| 摘 要： | Graphite material was used as the electrode for an all-vanadium redox flow battery, and the electrode was modified by transition metallic ions to enhance its electrochemical behavior. An porous graphite composite electrode has high specific surface area and high current density. The electrode modified by transition metallic ions has improved catalysis behavior that can catalyze the V（Ⅱ）-V（Ⅴ） redox reaction showed by cyclic voltammograms. This article studied the impedance of the modified electrode by electrochemical impedance spectroscopy （EIS）, and approved that the electrode modified by Co^2＋ and Mn^2＋ has a lower charge transfer resistance than the non-modified electrode. The effect of average particle size distribution is at lower frequencies that the slope of Warburg impedance is reduced by large particle size distribution. The voltage efficiency of the Co^2＋ modified electrode test cell is 81.5%, which is higher than that of the non-modified electrode.
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| 关 键 词： | 过渡金属离子修饰电极 酸性硫酸氧钒溶液 电化学性质 燃料电池 |
| 收稿时间： | 2006-01-05 |
Study of the electrochemical properties of a transition metallic ions modified electrode in acidic VOSO4 solution |
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| WANG Wenhong,WANG Xindong. Study of the electrochemical properties of a transition metallic ions modified electrode in acidic VOSO4 solution[J]. Rare Metals, 2007, 26(2): 131-135. DOI: 10.1016/S1001-0521(07)60172-7 |
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| Authors: | WANG Wenhong WANG Xindong |
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| Affiliation: | 1. Department of Advanced Energy Materials, College of Materials Science and Engineering, Sichuan University, Chengdu 610065, PR China;2. College of Vanadium and Titanium, Panzhihua University, Panzhihua 617000, PR China |
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| Abstract: | Graphite material was used as the electrode for an all-vanadium redox flow battery, and the electrode was modified by transition metallic ions to enhance its electrochemical behavior. An porous graphite composite electrode has high specific surface area and high current density. The electrode modified by transition metallic ions has improved catalysis behavior that can catalyze the V(II)-V(V) redox reaction showed by cyclic voltammograms. This article studied the impedance of the modified electrode by electrochemical impedance spectroscopy (EIS), and approved that the electrode modified by Co2+ and Mn2+ has a lower charge transfer resistance than the non-modified electrode. The effect of average particle size distribution is at lower frequencies that the slope of Warburg impedance is reduced by large particle size distribution. The voltage efficiency of the Co2+ modified electrode test cell is 81.5%, which is higher than that of the non-modified electrode. |
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| Keywords: | secondary energy source redox flow battery porous electrode ac impedance chemical modified electrode |
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