铈掺杂量对钛基锡锰铈氧化物涂层电极表面形貌及电化学性能的影响  

Effect of Ce dosage on surface morphology and electrochemical properties of Ti-based SnO_(2)/MnO_(2)+CeO_(2) coated electrode

作　　者：蒋嘉辰 张学敏[1] 寇圣明 JIANG Jiachen;ZHANG Xuemin;KOU Shengming(College of Environment and Municipal Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)

机构地区：[1]兰州交通大学环境与市政工程学院,甘肃兰州730070

出　　处：《电镀与涂饰》2024年第7期51-58,共8页Electroplating & Finishing

基　　金：甘肃省科技计划(20JR2RA002);甘肃省黄河水环境重点实验室开放基金(21YRWEK002)。

摘　　要：[目的]电沉积用钛基二氧化锰电极的电化学性能有待提高。[方法]采用热分解法在450℃下制备了以SnO_(2)为中间层,稀土铈掺杂量不同的钛基MnO_(2)电极(Ti/SnO_(2)/MnO_(2)+CeO_(2)),通过场发射扫描电子显微镜与循环伏安测量、电化学阻抗谱、析氧极化曲线测试、加速寿命试验等电化学方法对电极的活性层形貌及电化学行为进行分析。[结果]铈掺杂可以明显改变活性层形貌,使其形成由大量圆形晶粒组成,均匀且致密的表面结构。当铈掺杂量为4%时,电极具有最平整的活性表层,其伏安电荷容量约为未掺杂铈时的6倍,加速寿命约为未掺杂铈时的1.8倍。[结论]适量掺杂铈可以提高钛基二氧化锰涂层电极的电催化活性及延长其使用寿命。[Introduction]The electrochemical performance of Ti-based MnO_(2) coated electrode for electrodeposition needs to be improved.[Method]Ti-based MnO_(2) electrodes doped with different amounts of Ce(Ti/SnO_(2)/MnO_(2)+CeO_(2))were prepared with SnO_(2) as intermediate layer by thermal decomposition at 450℃.The morphology and electrochemical behavior of the active layer of the electrodes were analyzed by field-emission scanning electron microscopy and electrochemical methods such as cyclic voltammetry,electrochemical impedance spectroscopy,oxygen evolution polarization curve measurement,and accelerated life test.[Result]The doping of Ce significantly changed the morphology of the active layer and formed a uniform and compact structure on the electrode surface which were composed of a large number of spherical grains.The electrode doped with 4%of Ce had the smoothest active surface layer,a voltammetric charge about 6 times that of the undoped electrode,and an accelerated lifetime about 1.8 times that of the undoped one.[Conclusion]Appropriate doping of cerium can improve the electrocatalytic activity of Ti-based MnO_(2) coated electrode and prolong its service life.

关 键 词：钛基氧化物涂层电极 氧化锡 二氧化锰 氧化铈 热分解 表面形貌 电化学 

分 类 号：TG178[金属学及工艺—金属表面处理]