文献类型：期刊文献

中文题名：B_2O_3在镁电解质中阴极还原机理的研究

英文题名：Study on the Cathodic Reduction Mechanism of B_2O_3 in Magnesium Electrolyte

作者：刘江宁[1];孙泽[1];李冰[1];宋兴福[1];于建国[1]

机构：[1]华东理工大学盐湖工业技术研究中心,上海200237

年份：2008

期号：2

起止页码：15

中文期刊名：有色金属（冶炼部分）

外文期刊名：Nonferrous Metals（Extractive Metallurgy)

收录：CSTPCD;;北大核心:【北大核心2004】；

基金：教育部高校科技创新工程重大项目培育资金项目(705015)

语种：中文

中文关键词：镁电解质;B2O3;阴极还原;准可逆过程;前行化学反应

外文关键词：Magnesium electrolyte; B2O3; Cathodic reduction; Quasi-reversible process; Prior chemical reaction

摘要：采用循环伏安法、方波伏安法和计时电位法以W丝为工作电极,研究了KCl-CaCl2-NaCl-MgCl2熔盐中B2O3的阴极电化学还原机理。研究结果表明:B2O3在W电极的还原反应是包含3电子的准可逆过程,且产物B不可溶;还原过程受扩散和电子转移步骤混合控制,并存在前行化学反应;前行化学反应的平衡常数、正向和逆向反应速率常数分别为K=1.22、k1=0.72 s-1、k-1=0.59 s-1。
The cathodic reduction mechanism of B2O3 in magnesium electrolyte was investigated on tungsten working electrode using cyclic voltammetry, square wave voltammetry and chronopotentiometry method. The results show that the cathodic reduction of B2O3 was a quasi-reversible process followed by a threeelectron transfer step; the reduction process was controlled by both diffusion and electron transfer step involved a prior chemical reaction; the equilibrium constant, the forward and backward reaction rate of the reaction were K=1. 22, k1=0.72 s^-1 and k-1 =0.59 s^-1 respectively.