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A N,P-co-doped 3D graphene/cobalt-embedded electrocatalyst for the oxygen reduction reaction

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Abstract

The development of highly-efficient oxygen reduction reaction (ORR) catalysts is of great importance but remains challenging for energy applications including fuel cells and metal–air batteries. In this study, novel hybrids composed of Co nanoparticles and N,P co-doped graphene aerogels are successfully synthesized by combining a hydrothermal method with the subsequent pyrolysis procedure. Our fabricated Co/N,P-GA-900 possesses a high BET surface area (619 m2 g−1) with hierarchical porous structures. For the electrocatalytic evaluation of the ORR in an alkaline medium, the onset potential (−0.04 vs. SCE) and the half-wave potential (−0.18 V vs. SCE) of the Co/N,P-GA-900 catalyst are determined to be very close to those (−0.01 and −0.16 V vs. SCE) of the commercial Pt/C catalyst. The methanol tolerance and operational stability of Co/N,P-GA-900, however, are superior to those of commercial Pt/C. The high catalytic activity and excellent durability of our as-obtained Co/N,P-GA-900 arise from hierarchical porous structures of graphene aerogels and synergetic effects between multiple types of active sites, including metallic Co nanoparticles, nitrogen and phosphorus dopants. The work presented here provides a new platform for an attractive Pt-free catalyst for fuel cells.

Graphical abstract: A N,P-co-doped 3D graphene/cobalt-embedded electrocatalyst for the oxygen reduction reaction

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Publication details

The article was received on 28 Jul 2017, accepted on 04 Nov 2017 and first published on 06 Nov 2017


Article type: Paper
DOI: 10.1039/C7NJ02765F
Citation: New J. Chem., 2017, Advance Article
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    A N,P-co-doped 3D graphene/cobalt-embedded electrocatalyst for the oxygen reduction reaction

    X. Hu, X. Dai and X. He, New J. Chem., 2017, Advance Article , DOI: 10.1039/C7NJ02765F

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