金电极析氢反应过程中吸附氢原子的表面扩散及复合反应动力学研究

高等学校化学学报 ›› 2004, Vol. 25 ›› Issue (6): 1132.

金电极析氢反应过程中吸附氢原子的表面扩散及复合反应动力学研究

苏磊, 吴秉亮

武汉大学化学与分子科学学院, 武汉 430072

收稿日期:2003-04-01 出版日期:2004-06-24 发布日期:2004-06-24
通讯作者: 吴秉亮(1938年出生),男,教授,博士生导师,主要从事电化学研究.E-mail:blwujin@whu.edu.cn E-mail:blwujin@whu.edu.cn
基金资助:
国家自然科学基金(批准号:20273048)资助

Investigation of Surface Diffusion and Recombinaton Reaction Kinetics of Adsorbed H-Atoms in the Process of Hydrogen Evolving Reaction(HER) at Au Electrodes

SU Lei, WU Bing-Liang

College of Chemistry and Molecular Science, Wuhan University, Wuhan 430072, China

Received:2003-04-01 Online:2004-06-24 Published:2004-06-24

摘要/Abstract

摘要： 用特别设计的以平面金电极为工作电极,以Nafion膜为固体电解质的实验装置,对金电极析氢反应过程中吸附氢原子的表面扩散及吸附氢原子复合为氢分子的反应进行了定量研究,发现吸附氢原子在金表面上的扩散及复合反应引起了电流增加.对这一随时间变化的电流增加数据进行计算机模拟和数值拟合,得到金电极析氢反应中吸附氢原子的表面扩散系数、复合反应常数及其它动力学参数,并对数据进行了讨论.

关键词: 金电极, 表面扩散, 吸附中间物, 氢析出反应

Abstract: In the electrochemical devices with the proton exchange membrane(PEM) as the ion conductor the surface diffusion of the adsorbed intermediates impels the catalyst particles which are not in contact with the PEM to take part in the electrode reaction,and thus increases the utilization efficiency of the catalyst. In this paper,a specially designed experimental device based on the planar Au as the working electrode has been used to study the surface diffusion and the recombination reaction of overpotential-deposited(OPD) H-atoms in the process of the HER on the gold surface. In the chronoamperometric experiment,it was observed that the experimental current increases due to the surface diffusion and recombination reaction of the OPD H-atoms on the surface of gold. Under the supposed kinetic model,the numeric analysis has been done,and the surface concentration of the OPD H-atoms as the function of the reaction potential,the surface diffusion coefficient and the kinetic constant of surface recombination reaction were obtained by fitting current obtained experimentally.

Key words: Au electrode, Surface diffuse, Adsorbed intermediate, Hydrogen evolving reaction

中图分类号:

O643

TrendMD:

苏磊, 吴秉亮. 金电极析氢反应过程中吸附氢原子的表面扩散及复合反应动力学研究. 高等学校化学学报, 2004, 25(6): 1132.

SU Lei, WU Bing-Liang. Investigation of Surface Diffusion and Recombinaton Reaction Kinetics of Adsorbed H-Atoms in the Process of Hydrogen Evolving Reaction(HER) at Au Electrodes. Chem. J. Chinese Universities, 2004, 25(6): 1132.

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