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Cu(Ⅱ)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,Cu(Ⅱ)离子主要以CuCl_4^(2-)络合离子形式存在,而CuCl_4^(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。
The kinetics and mechanism of cathodic reduction of copper( I[ ) 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(Il ) 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: CuCl_4^(2-)(?)CuCl_3^-+Cl^- CuCl_3^-+e—→CuCl_2^-+Cl^- CuCl_2^- + e—→Cu + 2C1-
关键词
氯盐溶液
离子
铂电极
铜
还原
electrolysis of chlorides
agueous solution electrolysis
copper
electrochemical kinetics
