Engineering grain boundaries at the 2D limit for the hydrogen evolution reaction

Atom-thin transition metal dichalcogenides (TMDs) have emerged as fascinating materials and key structures for electrocatalysis. So far, their edges, dopant heteroatoms and defects have been intensively explored as active sites for the hydrogen evolution reaction (HER) to split water. However, grain...

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Detalhes bibliográficos
Autores: He, Yongmin, Tang, Peng-Yi, Hu, Zhili, He, Qiyuang, Zhu, Chao, Wang, Luqing, Zeng, Qingsheng, Golani, Prafful, Gao, Guanhui, Fu, Wei, Huang, Zhiqi, Gao, Caitian, Xia, Juan, Wang, Xingli, Wang, Xuewen, Ramasse, Quentin M., Zhang, Ao, An, Boxing, Zhang, Yongzhe, Martí-Sànchez, Sara, Morante, Joan Ramón, Wang, Liang, Tay, Beng Kang, Yakobson, Boris I., Trampert, Achim, Zhang, Hua, Wu, Minghong, Wang, Qi Jie, Arbiol, Jordi, Liu, Zheng
Tipo de documento: artigo
Estado:Versão publicada
Data de publicação:2020
País:España
Recursos:Consejo Superior de Investigaciones Científicas (CSIC)
Repositório:DIGITAL.CSIC. Repositorio Institucional del CSIC
OAI Identifier:oai:digital.csic.es:10261/218753
Acesso em linha:http://hdl.handle.net/10261/218753
Access Level:Acceso aberto
Descrição
Resumo:Atom-thin transition metal dichalcogenides (TMDs) have emerged as fascinating materials and key structures for electrocatalysis. So far, their edges, dopant heteroatoms and defects have been intensively explored as active sites for the hydrogen evolution reaction (HER) to split water. However, grain boundaries (GBs), a key type of defects in TMDs, have been overlooked due to their low density and large structural variations. Here, we demonstrate the synthesis of wafer-size atom-thin TMD films with an ultra-high-density of GBs, up to ~1012 cm−2. We propose a climb and drive 0D/2D interaction to explain the underlying growth mechanism. The electrocatalytic activity of the nanograin film is comprehensively examined by micro-electrochemical measurements, showing an excellent hydrogen-evolution performance (onset potential: −25 mV and Tafel slope: 54 mV dec−1), thus indicating an intrinsically high activation of the TMD GBs.

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