▎ 摘　　要

Non-platinum graphene-based electrocatalysts are vital for low-cost energy conversion by hydrogen fuel cell. However, high oxygen reduction reaction (ORR) overpotentials limit their efficiency and stability. Here, we propose a strategy to increase graphene Fermi level by graphene encapsulating a metal with lower work function than graphene, aiming to enhance the ORR activity of graphene-based materials. As an example, Ag nanoparticles (function work, 4.2 eV) are embedded into N-doped graphene (function work, 4.5 eV) (Ag@NG). The Ag@NG exhibits the ORR onset potential of 0.804 V and excellent stability over 10000 electrochemical cycles in acidic electrolyte. Spectroscopic analysis confirms Ag-N coordination bond as an efficient electron transfer route significantly benefiting upshift of graphene Fermi level that enhances the ORR activity and stability.