Journal
ACS APPLIED MATERIALS & INTERFACES
Volume 6, Issue 20, Pages 17654-17660Publisher
AMER CHEMICAL SOC
DOI: 10.1021/am503895w
Keywords
nitrogen-doped mesoporous graphene; catalyst; cobalt oxide; oxygen reduction reaction; electrocatalysis
Funding
- NSFC [21375022, 21175028]
- State Key Lab of Molecular Engineering of Polymers
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To balance the anchoring sites and conductivity of the catalyst supports is a dilemma in electrocatalytic oxygen reduction reaction (ORR). Nitrogen-doped mesoporous graphene (N-MG) with large surface area, high porosity, and superior intrinsic conductivity has been developed to address this issue. Using N-MG as the backbone, a hybrid catalyst of Co3O4 nanocrystals embedded on N-MG (Co3O4/N-MG) was prepared for the electrocatalytic ORR in alkaline media. The Co3O4/N-MG showed high catalytic activity for the four-electron ORR, giving a more positive onset potential (0.93 V vs RHE) and a higher current density. The unique property of N-MG and the synergetic effect of Co3O4 and N-MG are prominent for ORR. With improved electrocatalytic activity and durability, the Co3O4/N-MG can be an efficient nonprecious metal catalyst and potentially used to substitute the platinum-based cathode catalysts in fuel cells and metal-air batteries.
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