CoSe_(2)/C催化剂在电催化氧还原中的应用研究进展

Applications of CoSe_(2)/C Catalyst in Electrocatalytic Oxygen Reduction

介绍了铂基材料作为聚合物电解质膜燃料电池阴极催化剂的优点及存在的问题,对酸性和碱性电解液中氧还原反应机理进行了分析,讨论了氧分子在催化剂表面吸附模式对氧还原反应机理的影响。探讨了CoSe_(2)化合物晶体结构类型与特点及其与催化性能的关系,CoSe_(2)化合物主要有立方黄铁矿型(c-CoSe_(2))和正交白铁矿型(o-CoSe_(2))2种类型,通常c-CoSe_(2)比o-CoSe_(2)催化活性高。综述了CoSe_(2)/C催化剂的研究进展,着重讨论了制备方法、表面修饰、过渡金属掺杂、Co/Se物质的量之比以及碳载体等因素对CoSe_(2)/C催化剂的氧还原催化活性、反应机理、稳定性以及耐毒化性能的影响,提出了CoSe_(2)/C催化剂存在的问题以及发展前景。

The advantages and major problems of platinum-based materials as cathode catalyst for polymer electrolyte membrane fuel cells(PEMFCs)are briefly introduced.The mechanisms of oxygen reduction reaction in acidic and alkaline electrolytes are analyzed and the influences of the adsorption modes of oxygen molecules on the surface of catalyst for the mechanism of oxygen reduction reaction are discussed.The crystalline structures and characteristics of CoSe_(2) compound and the relationship with catalytic properties are discussed.The CoSe_(2) compound mainly consists of cubic pyrite type(c-CoSe_(2))and orthogonal white pyrite type(o-CoSe_(2)).Generally,c-CoSe_(2) has higher catalytic activity than o-CoSe_(2).The research progress of the CoSe_(2)/C catalysts is reviewed.In particular,the effects of preparation method,surface modification,transition metal doping,Co/Se ratio and carbon support on the catalytic activity,reaction mechanism,stability and toxicity resistance of CoSe_(2)/C catalysts are reviewed.The existing problems and the development prospects of the CoSe_(2)/C catalyst are pointed out.