期刊
CARBON
卷 115, 期 -, 页码 11-17出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.carbon.2016.12.094
关键词
-
资金
- National Natural Science Foundation of China [21376013]
Density functional theory calculations were performed to cast insight into the mechanism of the activation of O-2 by Pt single atom and Pt-4 nanocluster deposited on single vacancy and different pyridinic N doped graphene. It is found that the graphene by introducing pyridinic N can make supported Pt single atom and Pt-4 nanocluster accumulate more positive polarized charges, which upshift the d-band centers of the supported Pt single atom and Pt-4 nanocluster toward the Fermi level. It is also observed that the more pyridinic N in grapheme is, the more positive polarized charges is accumulated by supported Pt single atom and Pt-4 nanocluster. The positive charged sites is favour the dissociation of O-2. We find that the energy barrier of O-2 dissociation almost decrease linearly with the increase Pt positive polarized charges. Our work reveals that the Pt positive polarized charges can act as microscopic driving force for O-2 dissociation. (C)2017 Elsevier Ltd. All rights reserved.
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