Electrochemistry of silver iodide. Double layer properties in the presence of adsorbed organic molecules

B.H Bijsterbosch, J Lyklema
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引用次数: 46

Abstract

The surface charge on silver iodide suspended in a solution has been measured as a function of the potential of a cell consisting of a silver-silver iodide electrode, the solution under consideration, and a reference electrode. The influence of urea, n-propyl-, n-butyl-, isobutyl-, sec-butyl-, tert-butyl-, and n-amyl alcohol was investigated. Thermodynamic analysis shows that the surface excess of adsorbed alcohols if plotted as a function of the cell potential passes through a maximum. This maximum does not coincide with the zero point of charge. The results suggest that nalcohols adsorb with their hydrophobic part towards the silver iodide. These features are also encountered with the mercury system. Differences between the two systems are quantitative rather than qualitative, e.g., the Gibbs free energies of adsorption on silver iodide are about 25% less negative than the corresponding ones on mercury.

碘化银的电化学。吸附有机分子时的双层性质
悬浮在溶液中的碘化银的表面电荷被测量为由银-碘化银电极、所考虑的溶液和参比电极组成的电池电位的函数。考察了尿素、正丙基-、正丁基-、异丁基-、仲丁基-、叔丁基-和正戊醇的影响。热力学分析表明,表面吸附醇的过剩量,如果绘制为电池电位的函数,将通过一个最大值。这个最大值与电荷零点不一致。结果表明,醇类化合物以其疏水部分吸附碘化银。水星系统也会遇到这些特点。两种体系之间的差异是定量的而不是定性的,例如,碘化银上的吉布斯自由能比汞上的相应吸附能负的少25%左右。
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