Nitrogen-doped Graphene Loaded with Cobalt Nanoparticles as Efficient Electrocatalysts for Oxygen Reduction Reaction

摘要

Developing non-noble-metal electrocatalysts used for efficient oxygen reduction reactions(ORR)is greatly significant in the advancement of fuel cells.Herein,a novel electrocatalyst Co/N-G has been synthesized via simply pyrolyzing the mixture of amino phenanthroline(NH2-Phen),graphene oxide and cobalt salt.The microstructure of the catalyst has been characterized by using HADDF-STEM,XRD,Raman and XPS,the results indicate that the precursor complex has formed Co nanoparticle during the high-temperature pyrolysis process.The obtained catalyst of Co/N-G shows relatively good ORR catalytic activity(E_(1/2)=0.80 V)and almost 4e-oxygen reduction pathway in alkaline.In addition,the Co/N-G catalyst shows better methanol-tolerant ability and longer-term stability than Pt/C catalyst.