Abstract
Silver-based catalysts have been exten sively investigated as the platinum substituted catalysts due to their high catalytic efficiency,low cost and long-term durability.In this study,the surfactant-free silver nanoparticles supported on graphene quantum dots were synthesized through a facile approach without addition of any other protecting ligands and reducing agents.The"surface-clean" silver nanoparticles had remarkable electrocatalytic performance towards oxygen reduction reaction(ORR) with the most efficient four-electron transfer process.Compared with commercial Pt/C catalyst,the hybrid nanoparticles showed comparable catalytic performance for ORR but much higher tolerance to methanol.Such silver nanoparticles supported on graphene quantum dots may have promising applications in alkaline fuel cells as an efficient Pt-free catalyst with high catalytic performance and low cost.
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