氯盐溶液中Cu(Ⅱ)离子在拍电极上的阴极还原

来源期刊：中南大学学报(自然科学版)1989年第5期

论文作者：曾振欧 韩淑华 邓军

文章页码：568 - 575

关键词：氯化物电解； 水溶液电解； 铜； 电化学反应； 电化学动力学

Key words：electrolysis of chlorides； agueous solution electrolysis； copper； electrochemical kinetics

摘    要：本文采用几种电化学研究方法探讨了酸性氯盐水溶液中CuⅡ)离子在铂电极上阴极还原生成金属铜的反应机理和电极过程动力学规律。在氯离子的摩尔浓度为1.5～4.0的酸性氯盐水溶液中,CuⅡ)离子主要以CuCl₄^2-络合离子形式存在,而CuCl₄^2-络合离子离解一个配位氯离子后在铂电极下进行分步放电还原生成金属铜。电极过程表现为扩散传质步骤控制的动力学规律。

Abstract: The kinetics and mechanism of cathodic reduction of copper(Ⅱ) ion at the plati- num electrode in an aqueous chloride solution have been studied by some electrochemical methods. It is a reversible electrode process that copper(Ⅱ) ion is reduced into metal copper in an aqueous chloride solution, In the electrode process the charge transfer occurs in two consecutive steps and the diffusion is a rate-determining step. The possible mechanism of electrode reaction which has been shown by the study is as follows: CuCl₄^2-—→CuCl₃^-+Cl^- CuCl₃^-+e—→CuCl₂^-+Cl^- CuCl₂^- + e—→Cu + 2C1-