期刊
JOURNAL OF POWER SOURCES
卷 345, 期 -, 页码 41-49出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2017.01.122
关键词
NiCo2O4/N-doped graphene composite; Nanocrystal; Tiny crystalline grain; Oxygen reduction reaction
资金
- NSFC [21607113]
- China Postdoctoral Science Foundation [2014M560182]
Oxygen reduction reaction (ORR) plays an important role in green energy conversion, although catalysts are necessary for overcoming its sluggish kinetic. Herein, a nanocrystal NiCo2O4/N-doped graphene composite material showing high ORR electrocatalytic activity is prepared. The resulting NiCo2O4/Ndoped graphene composite (NiCo2O4-NG/C) combines the advantages of both component materials and shows enhanced ORR electrocatalytic activity (i.e., more positive peak potential and half-wave potential compared with NiCo2O4) while having higher diffusion-limited current density values (-5.7 mA cm(-2), 1600 rpm), better tolerance to methanol, and improved stability than 20 wt% Pt/C. NiCo2O4 anchored on N-doped graphene are demonstrated to be nanocrystal with tiny crystalline grain (diameter < 5 nm) and result in large surface area, thereby allowing more active sites to be exposed. Moreover, the potential exposure of high-index planes may be also responsible for the observed high activity of these materials. (C) 2017 Elsevier B.V. All rights reserved.
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