Facile synthesis of Co-N4-doped mesoporous carbon for oxygen reduction reaction

Zhao, Hong, Su, Caina and Hui, K. S. (2017) Facile synthesis of Co-N4-doped mesoporous carbon for oxygen reduction reaction. Journal of the Electrochemical Society, 164 (4). F412-F417. ISSN 0013-4651

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Abstract

The oxygen reduction reaction (ORR) is a critical factor in fuel cells that has attracted significant research attention. Non-precious metal catalysts have improved the ORR activity considerably, but they still exhibit poorer ORR performance than commercial Pt-based catalysts. In this study, Co-N-4-doped mesoporous carbon (Co-N-4-MC) was prepared for the ORR using cobalt-azides as the Co-N-4-containing precursor, and ordered mesoporous silica SBA-15 as a template for achieving mesoporous structures. The Co-N-4-MC electrode exhibited remarkable ORR activity in an alkaline medium (a half-wave potential of -0.15 V vs. MMO, only similar to 19 mV deviation from the commercial Pt/C catalyst), high selectivity (electron-transfer number similar to 4) and excellent electrochemical stability (similar to 8 mV negative shift of the half-wave potential after 1000 cycles). The good performance of the Co-N-4- MC electrode was attributed to the synergetic effects of N-4, C and Co. In particular, the existence of graphitic pores in the Co-N-4-MC catalyst facilitated the diffusion of O-2 to the catalytic active sites, which benefited the progression of the ORR on the Co-N-4-MC catalyst. (C) 2017 The Electrochemical Society.

Item Type: Article
Uncontrolled Keywords: mesoporous carbon,n-doped carbon,orr
Faculty \ School: Faculty of Science > School of Mathematics
Related URLs:
Depositing User: Pure Connector
Date Deposited: 20 Jun 2017 05:05
Last Modified: 26 Aug 2020 23:48
URI: https://ueaeprints.uea.ac.uk/id/eprint/63771
DOI: 10.1149/2.1611704jes

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