电流密度对钴锰共掺杂二氧化铅阳极材料电化学性能的影响  

Effect of Current Density on the Electrochemical Performance of Co Mn Co-doped Lead Dioxide Anode Materials

作　　者：刘圆圆 余强[1] 陈阵[1] 朱薇[1] 胡琪 郑昭毅 尤红军 吕泽 陈帮耀 LIU Yuanyuan;YU Qiang;CHEN Zhen;ZHU Wei;HU Qi;ZHENG Zhaoyi;YOU Hongjun;LYU Ze;CHEN Bangyao(Faculty of Science,Kunming University of Science and Technology,Kunming 650500,China)

机构地区：[1]昆明理工大学理学院,昆明650500

出　　处：《材料导报》2022年第18期38-43,共6页Materials Reports

基　　金：国家自然科学基金(51464021)。

摘　　要：为了获得电催化活性和耐蚀性优异的电积铜阳极材料,采用Co、Mn共掺杂制备复合二氧化铅阳极材料,重点考察电流密度对复合阳极材料性能的影响。通过扫描电子显微镜(SEM)和X射线能谱仪(EDS)表征了镀层的微观形貌、元素组成;采用线性扫描伏安法(LSV)、交流阻抗谱(EIS)和Tafel曲线等电化学方法表征了阳极材料在电积铜液中的电催化活性和耐蚀性能。研究表明:低电流密度下制备的阳极材料晶粒尺寸小,呈颗粒状,致密均匀,具有良好的电催化活性和耐蚀性;综合考察后,最终确定5 mA·cm^(-2)为制备阳极材料的最优电流密度。适宜的沉积电流密度有助于有效控制PbO_(2)的沉积速率、产生细小且均匀的晶粒、增大阳极材料比表面积,同时能够保证Co、Mn在镀层中的掺杂量,有效提升阳极材料的电催化活性。均匀致密镀层的形成,减少了阳极材料的缺陷,使之在介质中不易发生腐蚀从而表现出良好的耐蚀性。In order to obtain electrowinning copper anode materials with excellent electrocatalytical activity and corrosion resistance,the composite lead dioxide anode materials were prepared by doping Co and Mn,and the effect of current density on the performance of composite anode materials was investigated.The micro-morphology and elemental composition of the coating were characterized by scanning electron microscope(SEM)and X-ray energy dispersive spectrum(EDS);electrochemical methods such as linear scanning voltammetry(LSV),electrochemical impedance spectroscopy(EIS)and Tafel curves were employed to characterize the electrocatalytical activity and corrosion resistance of anode materials in electrowinning copper solution.Result shows that the anode material prepared at a low current density has smaller grain size and is granular,dense and uniform,presenting good electrocatalytical activity and corrosion resistance;according to comprehensive investigation,5 mA·cm^(-2) is the best anode material preparation current density.Proper deposition current density can conduce to effectively controlling the deposition rate of PbO_(2),producing fine and uniform crystal grains,and increasing the specific surface area of the anode materials,and can ensure the doping amount of Co and Mn in the coating,essentially improving the electrocatalytical activity of the electrode materials.The formation of uniform and dense coating reduces the defects of electrode material,making the eletrode difficult to be corroded in the medium and exhibit good corrosion resistance.

关 键 词：二氧化铅阳极材料 电流密度 钴锰掺杂 电催化活性 耐蚀性 

分 类 号：TB331[一般工业技术—材料科学与工程]