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论文类型：期刊论文

发表时间：2018-06-01

发表刊物：NANO RESEARCH

收录刊物：SCIE

卷号：11

期号：6

页面范围：3490-3498

ISSN号：1998-0124

关键字：electrocatalysis; two-dimensional materials; core-shell; confinement catalysis; operando Raman

摘要：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.