Unveiling the superior hydrogen evolution reaction activity of 1T-2H MoS_(2)heterointerface by on-chip microdevices  

作　　者：Bowen Liu Junjie Xiong Shuaishuai Xu Xinying Luo Wenyan Yao Shigang Liu Yuting Du Qinghua Zhang Yang Gao Bin Wang 

机构地区：[1]CAS Key Laboratory of Nanosystem and Hierarchical Fabrication,National Center for Nanoscience and Technology(NCNST),Beijing 100190,China [2]University of Chinese Academy of Sciences,Beijing 100049,China [3]School of Materials Science and Engineering,China University of Petroleum(East China),Qingdao 266580,China [4]Beijing National Laboratory for Condensed Matter Physics,Institute of Physics,Chinese Academy of Sciences,Beijing 100190,China

出　　处：《Nano Research》2025年第1期149-156,共8页纳米研究（英文版）

基　　金：support from the National Key R&D Program of China(Nos.2021YFA1202802,2022YFF0712200,and 2022YFE0127400);the National Natural Science Foundation of China(No.22409037);the Young Elite Scientists Sponsorship Program by BAST(No.BYESS2023410);the CAS Pioneer Hundred Talents Program.

摘　　要：The identification and clarification of active sites of MoS_(2)have long been the focus of research efforts in hydrogen evolution reaction(HER).In this study,we constructed phase transition-induced 1T-2H MoS_(2)heterojunction via lithium intercalation and evaluated the HER activity using on-chip electrocatalytic microdevices(OCEMs).The heterojunction achieved an overpotential of only 226 mV at a cathodic current density of 10 mA/cm^(2),outperforming the basal planes of 1T and 2H MoS_(2).Furthermore,density functional theory(DFT)calculations demonstrated that the charge redistribution occurs at the 1T-2H MoS_(2)interface with electrons transferring from 1T to 2H MoS_(2),and the interfacial S atom at the top site of 1T MoS_(2)presents the smallest overpotential of 0.37 V.Moreover,the interference from highly active edge sites was avoided by precisely exposing specific active areas,quantitatively revealing the catalytic activity order of different types of in-plane MoS_(2)active sites.This work enables a systematic investigation of the HER activity of various active sites in MoS_(2),laying the foundation for quantitative analysis of activity in other lowdimensional materials.

关 键 词：on-chip microdevice phase transition heterojunction MoS_(2) hydrogen evolution reaction(HER) 

分 类 号：O64[理学—物理化学]