Journal
NANO RESEARCH
Volume 11, Issue 6, Pages 3490-3498Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-018-2029-5
Keywords
electrocatalysis; two-dimensional materials; core-shell; confinement catalysis; operando Raman
Categories
Funding
- National Natural Science Foundation of China [21688102, 91545204, 21522508, 21621063]
- Ministry of Science and Technology of China [2016YFA0200200, 2017YFB0602205]
- Strategic Priority Research Program of the Chinese Academy of Sciences [XDB17020200]
- DICP [DMTO201502, UN201707]
- QIBEBT [UN201707]
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Two-dimensional (2D) materials such as graphene and hexagonal boron nitride (h-BN) can be used as robust and flexible encapsulation overlayers, which effectively protect metal cores but allow reactions to occur between inner cores and outer shells. Here, we demonstrate this concept by showing that Pt@h-BN core-shell nanocatalysts present enhanced performances in H-2/O-2 fuel cells. Electrochemical (EC) tests combined with operando EC-Raman characterizations were performed to monitor the reaction process and its intermediates, which confirm that Pt-catalyzed electrocatalytic processes happen under few-layer h-BN covers. The confinement effect of the h-BN shells prevents Pt nanoparticles from aggregating and helps to alleviate the CO poisoning problem. Accordingly, embedding nanocatalysts within ultrathin 2D material shells can be regarded as an effective route to design high-performance electrocatalysts.
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