Nitrogen-Doped Mesoporous Graphene as a Synergistic Electrocatalyst Matrix for High-Performance Oxygen Reduction Reaction

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• 作者：Jingjing Xiao ; Xiaojun Bian ; Lei Liao ; Song Zhang ; Chang Ji ; Baohong Liu
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2014
• 出版时间：October 22, 2014
• 年：2014
• 卷：6
• 期：20
• 页码：17654-17660
• 全文大小：365K
• ISSN：1944-8252

文摘

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鈥揳ir batteries.

Keywords:

nitrogen-doped mesoporous graphene; catalyst; cobalt oxide; oxygen reduction reaction; electrocatalysis