高效电解二氧化锰电化学分析研究  

Electrochemical analysis for highly efficient manganese dioxide electrolysis

作　　者：裴启飞 卢文鹏 郭孟伟 邵伟春 王恩泽 张启波[2] PEI Qifei;LU Wenpeng;GUO Mengwei;SHAO Weichun;WANG Enze;ZHANG Qibo(Yunnan Chihong Zn&Ge Co.,Ltd.,Qujing 655011,Yunnan,China;Faculty of Metallurgical and Energy Engineering,Kunming University of Science and Technology,Kunming 650093,China)

机构地区：[1]云南驰宏锌锗股份有限公司,云南曲靖655011 [2]昆明理工大学冶金与能源工程学院,昆明650093

出　　处：《有色金属科学与工程》2023年第5期606-614,共9页Nonferrous Metals Science and Engineering

基　　金：国家自然科学基金资助项目(21962008)。

摘　　要：采用循环伏安、线性伏安、电化学阻抗谱等分析测试手段并结合电解实验,系统地研究了硫酸体系下Mn^(2+)的电化学氧化行为。结果表明,Mn^(2+)→MnO_(2)的电氧化过程存在钝化现象,为实现MnO_(2)的高效电解,需合理控制阳极电位,从而避免析氧和生成MnO_(4)^(-)。升高电解温度可有效改善电解MnO_(2)过程的界面钝化;通过控制合理的阳极电流可获得更高的电流效率。在50g/LH_(2)SO_(4)+25g/L Mn^(2+)电解液中,80℃下,当阳极电流密度为6 mA/cm^(2)时,电流效率可达到96.6%。In this work,the electrochemical oxidation behavior of Mn^(2+)ions in sulfuric acid solutions was systematically studied via cyclic voltammetry,linear voltammetry,electrochemical impedance spectroscopy,and electrolytic experiments.The results show that a passivation phenomenon is present in the electro-oxidation process of Mn^(2+)to MnO_(2),suggesting that the applied current should be reasonably controlled to reduce the side reactions caused by polarization.To achieve high-efficient MnO_(2) electrolysis,the anodic potential should be controlled within an appropriate range to avoid oxygen evolution and the generation of MnO4-ions.Increasing the electrolytic temperature can significantly relieve the passivation on the interface during the electrolysis of MnO_(2),and combined with reasonable anodic current control,a higher current efficiency can be obtained.The optimum current efficiency of 96.6%for MnO_(2) electrolysis is achieved when the anodic current is 6 mA/cm^(2) and at 80℃in 50 g/L H_(2)SO_(4)solution containing 25 g/L Mn^(2+).

关 键 词：二氧化锰 阳极钝化 阳极电位 电流效率 高效电解 

分 类 号：TF803.27[冶金工程—有色金属冶金]