为了促进燃料电池的广泛应用,必须研发一种高效、经济的氧还原（ORR）催化剂材料替代目前使用的昂贵的Pt基催化剂. 本文合成了NiO@rGO、Pd-NiO@rGO和Ag-NiO@rGO三种催化剂材料,并对其ORR催化性能进行了比较研究. 结果表明,三种材料均具有催化ORR的能力,但与NiO@rGO相比,Pd-NiO@rGO和Ag-NiO@rGO展示了更加优异的性能,主要表现在其4电子转移ORR过程、起始电位增加,中间产物的产率降低和稳定性提高. 其中,Pd-NiO@rGO作为ORR催化剂的性能最好.

For pervasive applications of fuel cells, highly efficient and economical materials are required to replace Pt-based catalysts for oxygen reduction reaction (ORR). In this study, the NiO@rGO, Pd-NiO@rGO and Ag-NiO@rGO nanoparticles were synthesized, and their catalytic performances toward ORR were investigated. The results revealed that all the three materials were capable of catalyzing ORR, but both the Pd-NiO@rGO and Ag-NiO@rGO showed the better performances compared with the NiO@rGO in terms of the reaction pathway being 4-electron process, the increases of the onset potential and the intermediate yielding rate, as well as the extended stability. Moreover, the effect of Pd modification was superior to that of Ag.