面心立方金属电极氢析出反应统计力学处理

A Statistical Mechanical Treatment of Hydrogen Evolution Reaction on FCC Metal

应用统计力学方法建立的电极过程速度方程,在假定氢析出反应遵循催化机理的前提下,提出吸附氢原子间排斥能估算方案,计算了Ni、Pt、Pd、Cu、Ag、Au等六种面心立方金属电极上氢析出反应~lgi曲线,结果表明,其Tafel斜率b决定于电极表面吸附氢原子间的相互排斥作用,而截距a刚和金属原子半径、晶面点阵排列以及氢的吸附热等因素有关。

The kinetics of electrolytic hydrogen evolution reactions ( H.E.R. ) on FCC metals is considered in terms of statistical mechanics, assuming that the processes obey the catalytic mechanism. A method is proposed to calculate the inter-repulsed potentials between the hydrogen atoms adsorbed on crystal surfaces,and the theoretical η-lg(i) curves for H.E.R. on Ni, Pi, Ag, Cu, Au, and Pd arc plotted, respectively.The results show that the theoretical Tafel slope ( ■η/■ lg(i) = b ) is determined by inter-repulsion between the adsorbed hydrogen atoms, and the intercept a is dependent on the atomic radius and lattice array of metal, and heat of adsorption of hydrogen, etc.