Piezopotential-driven simulated electrocatalytic nanosystem of ultrasmall MoC quantum dots encapsulated in ultrathin N-doped graphene vesicles for superhigh H2 production from pure water

材料科学 石墨烯 纳米技术 量子点 兴奋剂 光电子学
作者
Wenhui Feng,Jie Yuan,Fan Gao,Bo Weng,Wenting Hu,Yanhua Lei,Xueyan Huang,Lu Yang,Jie Shen,Difa Xu,Xiangchao Zhang,Ping Liu,Shiying Zhang
出处
期刊:Nano Energy [Elsevier BV]
卷期号:75: 104990-104990 被引量:97
标识
DOI:10.1016/j.nanoen.2020.104990
摘要

A simulated electrocatalytic nanosystem of [email protected] assembled nanosheet is successfully constructed by a thermolysis procedure and first applied in piezocatalytic H2 production from pure water. Owing to the unique configuration of MoC quantum dots (QDs) encapsulated in ultrathin N-doped graphene (NG) vesicles ([email protected]), both the aggregation of MoC QDs and stack of ultrathin NG layers in [email protected] are suppressed simultaneously. When the integration is subjected in mechanical vibration, ultrathin NG layers can provide piezoelectric potential to trigger hydrogen evolution reaction (HER) on MoC QDs, while MoC QDs could not only collect free electrons to achieve the carriers’ intercomponent separation, but also provide rich and high-activity HER sites with lower overpotential. The rate of piezocatalytic H2 production from H2O is as high as 1.690 μmol h−1 mg−1, which is the reported highest H2 evolution rate of piezocatalytic water splitting without any sacrificial agents, even higher than ones in many photocatalytic pure water splitting systems. It is the synergy of piezoelectric ultrathin NG layers and conductive MoC QDs that predominantly contributes to a superhigh piezocatalytic performance. Furthermore, this design concept is expected to break a new ground in piezocatalysis.
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