Vertically mounting molybdenum disulfide nanosheets on dimolybdenum carbide nanomeshes enables efficient hydrogen evolution  

作　　者：Tingting Wang Pengyan Wang Yajun Pang Yitian Wu Jin Yang Hao Chen Xiaorui Gao Shichun Mu Zongkui Kou 

机构地区：[1]State Key Laboratory of Advanced Technology for Materials Synthesis and Processing,Wuhan University of Technology,Wuhan 430070,China [2]College of Chemistry and Materials Engineering,Zhejiang A&F University,Hangzhou 311300,China [3]Jiangsu Laboratory of Advanced Functional Materials,School of Electronic and Information Engineering,Changshu Institute of Technology,Changshu 215500,China

出　　处：《Nano Research》2022年第5期3946-3951,共6页纳米研究（英文版）

基　　金：The authors thank the supports from the Fundamental Research Funds for the Central Universities(No.40120631);the Zhejiang Provincial Natural Science Foundation(Nos.LQ22B060003 and LY20E020004);the Fundamental Research Funds for the Provincial Universities of Zhejiang(No.2020YQ005);the Research Foundation of Talented Scholars of Zhejiang A&F University(No.2020FR069).

摘　　要：Designing hierarchical heterostructure to optimize the adsorption of hydrogen intermediate(H*)is impressive for hydrogen evolution reaction(HER)catalysis.Herein,we show that vertically mounting two-dimensional(2D)layered molybdenum disulfide(MoS_(2))nanosheets on 2D nonlayered dimolybdenum carbide(Mo_(2)C)nanomeshes to form a hierarchical heterostructure largely accelerates the HER kinetics in acidic electrolyte due to the weakening adsorption strength of H*on 2D Mo_(2)C nanomeshes.Our hierarchical MoS2/Mo2C heterostructure therefore gives a decrease of overpotential for up to 500 mV at-10 mA·cm^(-2)and an almost 200-fold higher kinetics current density compared with the pristine Mo2C nanomeshes and maintains robust stability with a small drop of overpotential for only 16 mV upon 5,000 cycles.We further rationalize this finding by theoretical calculations and find an optimized adsorption free energy of H*,identifying that the MoS_(2)featuring strong H*desorption plays a key role in weakening the strong binding of Mo_(2)C with H*and therefore improves the intrinsic HER activity on active C sites of Mo_(2)C.This present finding shines the light on the rational design of heterostructured catalysts with synergistic geometry.

关 键 词：hydrogen evolution reaction transition metal carbide transition metal disulfide two-dimensional nonlayered/layered heterostructure hydrogen adsorption/desorption 

分 类 号：TB383[一般工业技术—材料科学与工程]