氯盐溶液中Pb(Ⅱ)离子在汞电极上阴极还原的机理

来源期刊：中南大学学报(自然科学版)1990年第6期

论文作者：曾振欧 王颖 陈丽莉

文章页码：679 - 684

关键词：氯化物电解； 水溶液电解； 铅； 电化学反应； 电化学动力学

Key words：electrolysis of chlorides； aqueous solution electrolysis； lead； electrochemical reaction； electrochemical kinetics

摘    要：本文采用多种电化学研究方法探讨了酸性氯盐水溶液中Pb（Ⅱ）离子在汞电极上阴极还原的电极过程。酸性氯盐水溶液中Pb（Ⅱ）离子在汞电极上阴极还原的两电荷传递一步完成,电极过程具有扩散传质步骤控制的动力学规律。Pb（Ⅱ）离子在酸性氯盐水溶液中主要以PbCl₃^-和PbCl₄^2-络合离子形式存在时,其电极反应表现为PbCl₃^-和PbCl₄^2-络合离子直接放电还原。

Abstract:

The kinetics and mechanism of cathodic reduction of lead （Ⅱ） ion at the mercury electrode in aqueous chloride solution have been studied by some electrochemical methods. It is a reversible electrode process that lead （Ⅱ） ion is reduced into metal in aqueous chloride solution. In the electrode process the transfer of the two charges occurs in one step and the diffusion is a rate-determining step. The passible mechanism of cathodic reaction which has been shown by the study is as follows:PbCl_x^2-x+2e→Pb+xCl^-x is 3 and 4.