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 H₂/O₂ 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.

中文翻译：

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Pt @ h-BN核壳型燃料电池电催化剂，电催化作用被限制在外壳下

二维（2D）材料（例如石墨烯和六方氮化硼（h-BN））可用作坚固且灵活的封装覆盖层，可以有效地保护金属核，但允许在内核与外壳之间发生反应。在这里，我们通过证明Pt @ h-BN核-壳纳米催化剂在H ₂ / O _2中表现出增强的性能来证明这一概念。燃料电池。进行了电化学（EC）测试和EC-拉曼操作表征，以监测反应过程及其中间体，这证实了Pt催化的电催化过程发生在几层h-BN覆盖下。h-BN壳的封闭作用可防止Pt纳米颗粒聚集，并有助于缓解CO中毒问题。因此，将纳米催化剂嵌入超薄2D材料壳中可被视为设计高性能电催化剂的有效途径。