Single MoTe_(2) sheet electrocatalytic microdevice for in situ revealing the activated basal plane sites by vacancies engineering  

作　　者：Huan Yang Yinghe Zhao Qunlei Wen Yan Mi Youwen Liu Huiqiao Li Tianyou Zhai 

机构地区：[1]State Key Laboratory of Materials Processing and Die&Mould Technology,and School of Materials Science and Engineering,Huazhong University of Science and Technology,Wuhan,430074,China [2]Guangxi Key Laboratory of Chemistry and Engineering of Forest Products,and School of Chemistry and Chemical Engineering,Guangxi University for Nationalities,Nanning,530008,China

出　　处：《Nano Research》2021年第12期4814-4821,共8页纳米研究（英文版）

基　　金：This work was financially supported by the National Natural Science Foundation of China(Nos.21805102,22071069,and 21825103);the Hubei Provincial Natural Science Foundation of China(No.2019CFA002);the Foundation of Basic and Applied Basic Research of Guangdong Province(No.2019B1515120087)。

摘　　要：Activating basal plane inert sites will endow MoTe_(2) with prominent hydrogen evolution reaction(HER)catalytic capability and arouse a new family of HER catalysts.Herein,we fabricated single MoTe_(2) sheet electrocatalytic microdevice for in situ revealing the activated basal plane sites by vacancies introducing.Through the extraction of electrical parameters of single MoTe_(2) sheet,the in-plane and interlayer conductivities were optimized effectively by Te vacancies due to the defect levels.More deeply,Te vacancies can induce the delocalization of electrons around Mo atoms and shift the d-band center,as a consequence,facilitate the adsorption of H from the catalyst surface for HER catalysis.Benefiting by the coordinated regulation of band structure and local charge density,the overpotential at−10 mA·cm^(−2)was reduced to 0.32 V after Te vacancies compared to 0.41 V for the basal plane sites of same MoTe_(2) nanosheet.Meanwhile,the insights gained from single nanosheet electrocatalytic microdevice can be applied to the improved HER of the commercial MoTe_(2) power.That the in situ testing of the atomic structure-electrical behavior-electrochemical properties of a single nanosheet before/after vacancies introducing provides reliable insight to structure-activity relationships.

关 键 词：MoTe_(2) electrocatalytic microdevice hydrogen evolution reaction vacancies engineering electron structure 

分 类 号：O64[理学—物理化学]