期刊
APPLIED CATALYSIS B-ENVIRONMENTAL
卷 225, 期 -, 页码 291-297出版社
ELSEVIER
DOI: 10.1016/j.apcatb.2017.11.057
关键词
Single-atom catalyst; Graphene; Amorphous carbon; Confined-interface-directed synthesis; Chemical catalysis
资金
- National Program on Key Basic Research Project (973 Program) [2013CBA01600]
- National Natural Science Foundation of China [51173055, 51572094, 51504168, 51401114, 51572016, U1530401]
- Natural Science Foundation of Hubei Province [2016CFB263]
- China Postdoctoral Science Foundation [2016M590034]
- Beijing Computational Science Research Center (CSRC)
- Special Program for Applied Research on Super Computation of the NSFC-Guangdong Joint Fund (the second phase)
The maximized atomic efficiency of supported catalysts is highly desired in heterogeneous catalysis. Therefore, the design and development of active, stable, and atomic metal-based catalysts remains a formidable challenge. To tackle these problems, it is necessary to investigate the interaction between single atoms and supports. Theoretical calculations indicate that the Pd binding strength is higher on graphene/amorphous carbon (AC) than that on graphene or AC substrate. Based on these predictions, we present a facile confined-interface-directed synthesis route for the preparation of single-atom catalysts (SACs) in which Pd atoms are well-dispersed on the interface of double-shelled hollow carbon nanospheres with reduced graphene oxide (RGO) as the inner shell and AC as the outer shell. Owing to the synergetic effect of the RGO/AC confined interface and the atomically dispersed Pd, the as-made RGO@AC/Pd SAC achieves the maximum atomic efficiency (catalytic activity) of Pd species and exhibits an excellent stability in chemical catalysis. This confined-interface-directed synthesis method provides a novel direction to maximize the atomic efficiency, improve the activity, and enhance the stability of metal-based catalysts.
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