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Indexed by:期刊论文

Date of Publication:2018-06-01

Journal:NANO RESEARCH

Included Journals:SCIE

Volume:11

Issue:6

Page Number:3490-3498

ISSN No.:1998-0124

Key Words:electrocatalysis; two-dimensional materials; core-shell; confinement catalysis; operando Raman

Abstract: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.