期刊
CARBON
卷 139, 期 -, 页码 1144-1151出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2018.08.020
关键词
-
资金
- Natural Science Foundation of China [51672204]
- Excellent Dissertation Cultivation Foundation of Wuhan University of Technology [2017-YS-013]
Developing high activity graphene-based materials for oxygen reduction reaction (ORR) catalysts remains a key issue for potential applications in fuel cells. According to the DFT calculation results, the distorted niobium-doped graphene (Nb-G) can process the high oxygen adsorption energy (Delta E) on Nb-G that improves the O-2 coverage on surfaces of catalysts. Further we find nitrogen (N) can activate Nb-G with higher Delta E and lower work function than Nb-G, promoting the adsorption of O-2 and breakage of O-O bond, in favor of the ORR performance. Before constructing N-activated Nb-G (N-Nb-G) materials with few-layer atomic layers, Nb-self-doped graphene is obtained from the 2D niobium carbide (NbC) only by one step incomplete chlorination reaction created by our group. This structural conversion from 2D NbC to Nb-G is accompanied by in-situ Nb doping which successfully overcomes the serious mismatch of lattices between carbon and transition metal atoms. The obtained N-Nb-G by annealing the mixture of melamine and Nb-G shows much enhanced ORR activity (The half-wave potential is 0.824 V). Undoubtedly, this work adds a family member of carbon-based materials with high ORR catalytic performance. (C) 2018 Elsevier Ltd. All rights reserved.
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