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 .
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. [WT5HZ]
出处
《高等学校化学学报》
SCIE
EI
CAS
CSCD
北大核心
2004年第6期1132-1136,共5页
Chemical Journal of Chinese Universities
基金
国家自然科学基金 (批准号 :2 0 2 73 0 48)资助
关键词
金电极
表面扩散
吸附中间物
氢析出反应
Au electrode
Surface diffuse
Adsorbed intermediate
Hydrogen evolving reaction
