石墨烯负载金属氧化物催化剂在氧还原反应中的研究进展

Research progress in metal-oxide supported on graphene as catalysts in oxygen reduction reaction

催化剂对氧还原反应(ORR)起到至关重要的作用。近年来,人们为寻找可替代Pt金属的高性能非贵金属催化剂付出了诸多努力。过渡金属氧化物作为具备优异ORR催化活性的催化剂之一,成本低廉、储量丰富,在ORR催化领域具有巨大潜力,因而引起广泛的研究。但由于大部分过渡金属氧化物导电性差,极大地阻碍了其催化活性,所以将其负载于合适的载体上,对提高ORR性能有重要意义。石墨烯以其独特的电子特性、优异的导电性以及其他良好的物理、化学性质被广泛作为载体使用。本文综述了石墨烯负载过渡金属氧化物作为ORR催化剂的研究进展,主要从石墨烯载体分类、制备方法、过渡金属氧化物分类等多角度讨论了该类催化剂在ORR中的应用及发展前景,指出石墨烯负载过渡金属氧化物作为ORR催化剂应致力于将开发杂原子掺杂石墨烯作为载体、复合金属氧化物作为活性物质的主要发展方向,并趋向于降低制备工艺的能耗和周期,提高催化剂的性能,达到降本增效的目的。

Catalysts have an essential effect on oxygen reduction reactions(ORR).In recent years,many efforts have been made to search high-performance non precious metal catalysts that can replace Pt metals.As one of the catalysts with excellent ORR catalytic activity,transition metal oxides have attracted extensive research due to their low cost and abundant reserves,which have great potential in the field of ORR catalysis.However,due to the poor conductivity of most transition metal oxides,which greatly hinders their catalytic activity,it is important to load them on suitable carriers to improve the performance of ORR.Graphene is widely used as support for its unique electronic properties,excellent electrical conductivity and other good physical and chemical properties.In this paper,the research progress of graphene-supported transition metal oxides as ORR electrocatalysts was reviewed.Primarily,the application,development and perspective of this type of ORR electrocatalysts were discussed from some perspectives,such as the classification of graphene support,the species of metal oxides,and preparation methods.In addition,the application and development of graphene-supported metal oxide catalyst in ORR were mentioned.Moreover,it was indicated that the main development direction of graphene-supported metal oxide as ORR catalysts should be focused on the heteroatom-doped graphene as carrier and composite metal oxide as active materials,and tend to reduce the energy consumption and period of preparation process,improve the performance of the catalysts,to achieve the purpose of cost reduction and efficiency.