摘要
根据本文系列I提出的电极/溶液界面溶剂化层偶极取向分布模型,拟合计算Ag(111)、Ag(100)及Ag(110)/水溶液界面的内层微分电容(C_1)～表面电荷密度(σ)变化关系。表明在银电极上,吸附水分子似分别稳定在金属原子点阵的顶位(111)或穴位(100)及(110)。讨论了溶剂化层的结构与性质对C_1～σ曲线可能产生的影响。
Based on the model of dipole orientation distribution presented in previous paper, the monolayer adsorption isotherm for solvent molecules at the interface of solid me- tal electrode wsa derived. The dependence of inner-layer differential capacity(C_1) on the surface charge density(σ) was estimated by curve-fitting for Ag(111), Ag(100) and Ag(110)/aqueous solution interface. The calculated results are shown. In analyzing the fitting parameters obtained from this treatment, it was found that the water molecules would preferentially be strongly adsorped on the top sites of (111)-plane,but would be on the hollow site at (110) -or (100) -plane. The high values of the inner-layer differential capacity for silver single crystal electrodes were interpreted in terms of those effects, i.e., the thickness of adsorption monolayer was diminished due to water molecules stably adsorbed on the hollow site of crystal face, and the influence of the interaction between metal and water molecules or between dipole-dipole of adsorbed molecules on the variation of potential drop acrossed the inner-layer with the surface charge at electrode.
出处
《物理化学学报》
SCIE
CAS
CSCD
北大核心
1991年第5期549-552,共4页
Acta Physico-Chimica Sinica
基金
国家自然科学基金
关键词
银单晶
电极
内层微分电容
双电层
Electrode/Solution interface, Electrical double layer, Inner layer differential capacity, Ag(single crystal) /aqueous system
