Electrochemical impedance studies of electrooxidation of methanol and formic acid on Pt/C catalyst in acid medium
Electrochemical impedance studies of electrooxidation of methanol and formic acid on Pt/C catalyst in acid medium
复制标题
酸性介质中Pt/C催化剂上甲醇和甲酸电氧化的电化学阻抗研究
DOI：
10.1016/j.jpowsour.2009.01.008
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发表时间：
2009-05
影响因子：
9.2
通讯作者：
Chu, Yuan-Yuan
中科院分区：
文献类型：
--
作者：
Shao, Ai-Fen;Yin, Ge-Ping;Zuo, Peng-Jian;Wang, Zhen-Bo;Chu, Yuan-Yuan
在25°C下，分别在含有0.5molL − 1H 2SO 4和含有0.5molL−1HCOOH的0.5molL− 1H 2SO 4溶液中，使用覆盖有Pt/C催化剂粉末的玻碳圆盘电极进行循环伏安法（CV）、电流i-t实验和电化学阻抗谱（EIS）测量。电化学测试表明，Pt/C对甲酸的电氧化活性显著高于对甲醇的电氧化活性。电化学阻抗信息还揭示了甲醇和甲酸在Pt/C催化剂上的电氧化在不同极化电位下表现出不同的阻抗行为。甲酸电氧化的机理和速率控制步骤也随电位的增加而改变。同时，揭示了电极电位对阻抗谱的影响。
Cyclic voltammetry (CV), amperometric i−t experiments, and electrochemical impedance spectroscopy (EIS) measurements were carried out by using glassy carbon disk electrode covered with the Pt/C catalyst powder in solutions of 0.5molL−1H2SO4containing 0.5molL−1CH3OH and 0.5molL−1H2SO4containing 0.5molL−1HCOOH at 25°C, respectively. Electrochemical measurements show that the activity of Pt/C for formic acid electrooxidation is prominently higher than for methanol electrooxidation. EIS information also discloses that the electrooxidation of methanol and formic acid on the Pt/C catalyst at various polarization potentials show different impedance behaviors. The mechanisms and the rate-determining steps of formic acid electrooxidation are also changed with the increase of the potential. Simultaneously, the effects of the electrode potentials on the impedance patterns were revealed.
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影响因子：
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