硫酸溶液中Mn(Ⅱ)/Mn(Ⅲ)电对的电化学氧化动力学研究  

Electrochemical oxidation kinetics of Mn(Ⅱ)/Mn(Ⅲ) pairs in sulfuric acid solution

作　　者：赵艳茹 陈志萍[1] 杨晓峰[1] 王高[2] 朱鹏强 张玉莹 ZHAO Yan-ru;CHEN Zhi-ping;YANG Xiao-feng;WANG Gao;ZHU Peng-qiang;ZHANG Yu-ying(School of Chemistry and Chemical Engineering,North University of China,Taiyuan 030051,China;School of Information and Communication Engineering,North University of China,Taiyuan 030051,China)

机构地区：[1]中北大学化学与化工学院,山西太原030051 [2]中北大学信息与通信工程学院,山西太原030051

出　　处：《化学研究与应用》2025年第2期386-391,共6页Chemical Research and Application

基　　金：山西省自然科学基金项目(201901D111138)资助;山西省回国留学人员科研资助项目(HGKY2019069)资助。

摘　　要：Mn(Ⅱ)/Mn(Ⅲ)反应在化学发光检测、有机合成以及液流电池等领域具有广泛的应用前景,但其动力学特性尚未得到充分的认识和理解。本研究采用计时电量法测定硫酸溶液中不同温度不同阶跃电位下Mn(Ⅱ)氧化为Mn(Ⅲ)的标准反应速率常数k0(4.67×10^(-5)m·s^(-1)-7.712×10^(-5)m·s^(-1)),并进一步求得表观活化能(20.84 kJ·mol^(-1))。此研究不仅为Mn(Ⅱ)/Mn(Ⅲ)电对及类似反应的电化学氧化动力学提供了新的方法,还为Mn(Ⅲ)的可控制备积累了基础数据。Mn(Ⅱ)/Mn(Ⅲ)reaction has a wide range of applications in chemiluminescence detection,organic synthesis and flow batteries,but the kinetics of Mn(Ⅱ)oxidation to Mn(Ⅲ)reaction has not been fully recognized and understood.In this study,the standard reaction rate constants k_0(4.67×10^(-5)m·s^(-1)-7.712×10^(-5)m·s^(-1))of Mn(Ⅱ)oxidation to Mn(Ⅲ)in sulfuric acid solution at different temperatures and different step potentials are determined by chronocoulometry,accompany with the apparent activation energy(20.84 kJ·mol^(-1))of this reaction is further obtained.This study which has provided a new method for the electrochemical oxidation kinetics of Mn(Ⅱ)/Mn(Ⅲ)pairs and similar reactions,accumulates basic data for the controllable preparation of Mn(Ⅲ).

关 键 词：Mn(Ⅱ)/Mn(Ⅲ) 计时电量法 扩散系数 反应速率常数 活化能 

分 类 号：O646[理学—物理化学]