2D/2D heterojunction interface:Engineering of 1T/2H MoS_(2) coupled with Ti_(3)C_(2)Tx heterostructured electrocatalysts for pH-universal hydrogen evolution  

作　　者：Jian Yiing Loh Feng Ming Yap Wee-Jun Ong 

机构地区：[1]School of Energy and Chemical Engineering,Xiamen University Malaysia,Sepang,Selangor Darul Ehsan 43900,Malaysia [2]Center of Excellence for NaNo Energy&Catalysis Technology(CONNECT),Xiamen University Malaysia,Sepang,Selangor Darul Ehsan 43900,Malaysia [3]State Key Laboratory of Physical Chemistry of Solid Surfaces,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China [4]Gulei Innovation Institute,Xiamen University,Zhangzhou 363200,China [5]Shenzhen Research Institute of Xiamen University,Shenzhen 518057,China

出　　处：《Journal of Materials Science & Technology》2024年第12期86-97,共12页材料科学技术（英文版）

基　　金：Ministry of Higher Education(MOHE)Malaysia under the Fundamental Research Grant Scheme(FRGS)(Ref No:FRGS/1/2020/TK0/XMU/02/1);We would also like to thank the Ministry of Science,Technology and Innovation(MOSTI)Malaysia under the Strategic Research Fund(SRF-APP)(S.22015);The authors would also like to acknowledge the financial support provided by the National Natural Science Foundation of China(Ref No.22202168);Guangdong Basic and Applied Basic Re-search Foundation(Ref No.2021A1515111019);We would also like to acknowledge the financial support from the State Key Labo-ratory of Physical Chemistry of Solid Surfaces,Xiamen University(No.2023X11);This work is also funded by Xiamen University Malaysia Investigatorship Grant(Grant No.IENG/0038);Xiamen University Malaysia Research Fund(ICOE/0001,XMUMRF/2021-C8/IENG/0041 and XMUMRF/2019-C3/IENG/0013);Hengyuan International Sdn.Bhd.(Grant No.EENG/0003).

摘　　要：Two-dimensional(2D)materials have come to light due to their unique thickness that owns abundant exposed edges with enhanced electrocatalytic properties.2D molybdenum disulfide(MoS_(2))nanosheet has aroused considerable attention due to its tunable surface chemistry and high electrochemical sur-face area.Nonetheless,several shortcomings associated with MoS_(2),such as its naturally existing semi-conducting 2H phase,which has limited active sites due to the inert basal plane,restrict its application in water electrocatalysis.Taking into account the benefits of the 1T/2H phase of MoS_(2),as well as the importance of engineering 2D/2D heterojunction interface for boosted electrocatalysis,metallic Ti_(3)C_(2)Tx was integrated with 1T/2H MoS_(2) to develop 2D/2D 1T/2H MoS_(2)/Ti_(3)C_(2)Tx heterostructured nanocompos-ites.Herein,with only 25%of the intercalating agent,1T/2H MoS_(2) with the highest 1T phase content of~82%was successfully synthesized.It was further incorporated with 1 wt%of Ti_(3)C_(2)Tx through a com-bination of ultrasonication and mechanical stirring process.The 1T/2H MoS_(2)(25D)/Ti_(3)C_(2)Tx-1(MTC-1)manifested outstanding electrocatalytic performance with an overpotential and Tafel slope of 280 mV(83.80 mV dec^(-1))and 300 mV(117.2 mV dec^(-1)),for catalyzing acidic and alkaline medium HER,respec-tively.Pivotally,the as-prepared catalysts also illustrated long-term stability for more than 40 h.The coupling method for the 2D nanosheets is crucial to suppress the oxidation of Ti_(3)C_(2)Tx and the restack-ing issue of 2D nanosheets.The superior HER activity is ascribed to the synergistic effect between the heterostructure,enhancing the electronic structure and charge separation capability.The intrinsic prop-erty of the catalyst further confirms by turnover frequency(TOF)calculation.As such,this research paves the way for designing high-efficiency 2D electrocatalysts and sheds light on the further advancement of tunable 2D electrocatalysts for robust water splitting and beyond.

关 键 词：2D/2D electrocatalysts Phase engineering pH universal Molybdenum disulfide Ti_(3)C_(2)Tx 

分 类 号：TQ116.2[化学工程—无机化工] O643.36[理学—物理化学] O644.1[理学—化学]