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Catalysts for oxygen reduction and evolution reactions are at the heart ofkey renewable energy technologies including fuel cells and water splitting.Despite tremendous efforts, developing oxygen electrode catalysts with highactivity at low costs remains a grand challenge. Here, we report a hybridmaterial of Co3O4 nanocrystals grown on reduced graphene oxide (GO) as ahigh-performance bi-functional catalyst for oxygen reduction reaction (ORR) andoxygen evolution reaction (OER). While Co3O4 or graphene oxide alone has littlecatalytic activity, their hybrid exhibits an unexpected, surprisingly high ORRactivity that is further enhanced by nitrogen-doping of graphene. TheCo3O4/N-doped graphene hybrid exhibits similar catalytic activity but superiorstability to Pt in alkaline solutions. The same hybrid is also highly activefor OER, making it a high performance non-precious metal based bi-catalyst forboth ORR and OER. The unusual catalytic activity arises from synergeticchemical coupling effects between Co3O4 and graphene.

Co3O4 Nanocrystals on Graphene as a Synergistic Catalyst for Oxygen Reduction Reaction