Preparation and electrocatalytic properties of Ti/IrO_2-Ta_2O_5 anodes for oxygen evolution  

作　　者：李保松 林安 甘复兴 

机构地区：[1]School of Resource and Environmental Science,Wuhan University

出　　处：《中国有色金属学会会刊：英文版》2006年第5期1193-1199,共7页Transactions of Nonferrous Metals Society of China

基　　金：Project(50499330) supported by the National Natural Science Foundation of China

摘　　要：The preparation and electrocatalytic activity for oxygen evolution of the thermally prepared Ti anodes coated with IrO2-Ta2O5 were studied. The structure and morphologies of the oxide films with different contents of IrO2 were determined by XRD and SEM respectively. Their electrochemical properties were studied by Linear Sweep Voltammetry, Tafel Plot and Cyclic Voltammetry. The results show that iridium and tantalum can form solid solution and the mutual solubility is affected by the ratio of Ir to Ta in coating solution. With increasing IrO2 content in the coatings, the amount of fine crystallites of IrO2 is increased and the electrocatalytic capability of oxygen evolution is strengthened. The coating adhesion and rigidity decrease, which affects electrochemical activity of the anode when the content of IrO2 is too high. The electrochemically active surface area is determined not only by the content of IrO2but also the structure and morphology of the anode coatings. It is probably due to the existence of proper quantities of inert Ta2O5 which results in a typical morphology of cracks and solid solution structure.The preparation and electrocatalytic activity for oxygen evolution of the thermally prepared Ti anodes coated with IrO2-Ta2O5 were studied. The structure and morphologies of the oxide films with different contents of IrO2 were determined by XRD and SEM respectively. Their electrochemical properties were studied by Linear Sweep Voltammetry, Tafel Plot and Cyclic Voltammetry. The results show that iridium and tantalum can form solid solution and the mutual solubility is affected by the ratio of Ir to Ta in coating solution. With increasing IrO2 content in the coatings, the amount of fine crystallites of IrO2 is increased and the electroeatalytic capability of oxygen evolution is strengthened. The coating adhesion and rigidity decrease, which affects electrochemical activity of the anode when the content of IrO2 is too high. The electrochemically active surface area is determined not only by the content of IrO2 but also the structure and morphology of the anode coatings. It is probably due to the existence of proper quantities of inert Ta2O5 which results in a typical morphology of cracks and solid solution structure.

关 键 词：IrO2-Ta2O5 电催化活性 氧排出 涂氧化层电极 

分 类 号：TG113[金属学及工艺—物理冶金]