期刊
NANO MATERIALS SCIENCE
卷 2, 期 2, 页码 120-131出版社
KEAI PUBLISHING LTD
DOI: 10.1016/j.nanoms.2019.10.008
关键词
Single-atom catalyst; Graphene; Stability; Activity; Density functional theory; Reaction descriptor
资金
- National Natural Science Foundation of China [91545122]
- Beijing Natural Science Foundation [2182066]
- Natural Science Foundation of Hebei Province of China [B2018502067]
- Fundamental Research Funds for the Central Universities [2017XS121]
- University of Calgary's Canada First Research Excellence Fund (CFREF) program entitled the Global Research Initiative for Sustainable Low Carbon Unconventional Resources
Single-atom catalysts (SACs) have been a research hotspot due to their high catalytic activity, selectivity, and atomic utilization rates. However, the theoretical research of SACs is relatively fragmented, which restricts further understanding of SAC stability and activity. To address this issue, we report our analysis of the geometric structures, electronic characteristics, stabilities, catalytic activities, and descriptors of 132 graphene-based single-atom catalysts (M/GS) obtained from density functional theory calculations. Based on the calculated formation and binding energies, a stability map of M/GS was established to guide catalyst synthesis. The effects of metal atoms and support on the charge of metal atoms are discussed. The catalytic activities of M/GS in both nitrogen and oxygen reduction reactions are predicted based on the calculated magnetic moment and the adsorption energy. Combined with the electronegativity and d-band center, a two-dimensional descriptor is proposed to predict the O adsorption energy on M/GS. More importantly, this theoretical study provides predictive guidance for the preparation and rational design of highly stable and active single-atom catalysts using nitrogen doping on graphene.
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