Carbonitride MXene Ti_(3)CN(OH)_(x)@MoS_(2)hybrids as efficient electrocatalyst for enhanced hydrogen evolution  

作　　者：Jizhou Jiang Fangyi Li Saishuai Bai Yongjing Wang Kun Xiang Haitao Wang Jing Zou Jyh-Ping Hsu 

机构地区：[1]School of Environmental Ecology and Biological Engineering,School of Chemistry and Environmental Engineering,Key Laboratory of Green Chemical Engineering Process of Ministry of Education,Engineering Research Center of Phosphorus Resources Development and Utilization of Ministry of Education,Novel Catalytic Materials of Hubei Engineering Research Center,Wuhan Institute of Technology,Wuhan 430205,China [2]Department of Chemical Engineering,“National Taiwan University”,Taipei 10617

出　　处：《Nano Research》2023年第4期4656-4663,共8页纳米研究（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.62004143 and 21902108);the Key Research and Development(R&D)Program of Hubei Province(No.2022BAA084);the Central Government Guided Local Science and Technology Development Special Fund Project(No.2020ZYYD033),the Natural Science Foundation of Hubei Province(No.2021CFB133);the Knowledge Innovation Program of Wuhan-Shuguang Project(No.2022010801020355).

摘　　要：Renewable energy powered electrocatalytic water splitting is a promising strategy for hydrogen generation,and the design and development of high-efficiency and earth-abundant electrocatalysts for hydrogen evolution reaction(HER)are highly desirable.Herein,MoS2 nanoflowers decorated two-dimensional carbonitride-based MXene Ti3CN(OH)x hybrids have been constructed by etching and post-hydrothermal methods.The electrochemical performance of the as-obtained Ti_(3)CN(OH)_(x)@MoS_(2)hybrids having a quasi core-shell structure is fascinating:An overpotential of 120 mV and a Tafel slope of 64 mV∙dec^(−1)can be delivered at a current density of 10 mA∙cm^(−2).And after 3,000 cyclic voltammetry cycles,it can be seen that there is no apparent attenuation.Both the experimental results and density functional theory(DFT)calculations indicate that the synergetic effects between Ti_(3)CN(OH)x and MoS_(2)are responsible for the robust electrochemical HER performance.The electrons of-OH group in Ti_(3)CN(OH)x are transferred to MoS_(2),making the adsorption energy of the composite for H almost vanish.The metallic Ti_(3)CN(OH)x is also beneficial to the fast charge transfer kinetics.The construction of MXene-based hybrids with optimal electronic structure and unique morphology tailored to the applications can be further used in other promising energy storage and conversion devices.

关 键 词：Ti_(3)CN(OH)x MoS_(2) hydrogen evolution reaction density functional theory(DFT)calculations 

分 类 号：O64[理学—物理化学]