Electrochemical impedance studies of methanol electro-oxidation on Pt/C thin film electrode
Electrochemical impedance studies of methanol electro-oxidation on Pt/C thin film electrode
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DOI：
10.1149/1.1467940
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发表时间：
2002-05-01
影响因子：
3.9
通讯作者：
Leng, YJ
中科院分区：
文献类型：
--
作者：
Hsing, IM;Wang, X;Leng, YJ
用电化学阻抗谱研究了甲醇在Pt/C薄膜电极上的阳极氧化过程。研究了电极电位对阻抗谱的影响，并利用新推导的数学模型定量解释了甲醇氧化的阻抗行为。理论推导与实验结果吻合较好，两者都表明阻抗模式强烈依赖于电极电位。在高于0.30 V（vs. Ag/AgCl）的电势下，观察到“伪感应”行为。在高于0.42 V（相对于Ag/AgCl）的电位下，阻抗模式反转到第二和第三象限。阻抗模式反转所需的条件划定与使用的阻抗模型。(C)2002年电化学学会。
Anodic processes of methanol oxidation on Pt/C thin film electrodes are carefully examined using electrochemical impedance spectroscopy. The influence of the electrode potential on the impedance pattern is studied and a quantitative explanation for the impedance behavior of methanol oxidation is achieved using a newly derived mathematical model. Theoretical derivations agree well with the experimental results, both of which show that the impedance patterns are strongly dependent on the electrode potential. At potentials higher than 0.30 V (vs. Ag/AgCl), a "pseudoinductive'' behavior is observed. At potentials higher than 0.42 V (vs. Ag/AgCl), the impedance pattern is reversed to the second and third quadrants. The conditions required for the reversing of impedance pattern are delineated with the use of the impedance model. (C) 2002 The Electrochemical Society.