2D/2D heterojunction interface:Engineering of 1T/2H MoS2 coupled with Ti3C2Tx heterostructured electrocatalysts for pH-universal hydrogen evolution

Jian Yiing Loh ¹Feng Ming Yap ¹Wee-Jun Ong²

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作者信息

1. School of Energy and Chemical Engineering,Xiamen University Malaysia,Sepang,Selangor Darul Ehsan 43900,Malaysia;Center of Excellence for NaNo Energy & Catalysis Technology(CONNECT),Xiamen University Malaysia,Sepang,Selangor Darul Ehsan 43900,Malaysia
2. School of Energy and Chemical Engineering,Xiamen University Malaysia,Sepang,Selangor Darul Ehsan 43900,Malaysia;Center of Excellence for NaNo Energy & Catalysis Technology(CONNECT),Xiamen University Malaysia,Sepang,Selangor Darul Ehsan 43900,Malaysia;State Key Laboratory of Physical Chemistry of Solid Surfaces,College of Chemistry and Chemical Engineering,Xiamen University,Xiamen 361005,China;Gulei Innovation Institute,Xiamen University,Zhangzhou 363200,China;Shenzhen Research Institute of Xiamen University
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Abstract

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(MoS2)nanosheet has aroused considerable attention due to its tunable surface chemistry and high electrochemical sur-face area.Nonetheless,several shortcomings associated with MoS2,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 MoS2,as well as the importance of engineering 2D/2D heterojunction interface for boosted electrocatalysis,metallic Ti3C2Tx was integrated with 1T/2H MoS2 to develop 2D/2D 1T/2H MoS2/Ti3C2Tx heterostructured nanocompos-ites.Herein,with only 25％of the intercalating agent,1T/2H MoS2 with the highest 1T phase content of～82％was successfully synthesized.It was further incorporated with 1 wt％of Ti3C2Tx through a com-bination of ultrasonication and mechanical stirring process.The 1T/2H MoS2(25D)/Ti3C2Tx-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 Ti3C2Tx 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.

Key words

2D/2D electrocatalysts/Phase engineering/pH universal/Molybdenum disulfide/Ti3C2Tx

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基金项目

Ministry of Higher Education(MOHE)Malaysia under the Fundamental Research Grant Scheme(FRGS)(Ref FRGS/1/2020/TK0/XMU/02/1)

Ministry of Science,Technology and Innovation(MOSTI)Malaysia under the Strategic Research Fund(SRF-APP)(S.22015)

National Natural Science Foundation of China(Ref 22202168)

Guangdong Basic and Applied Basic Research Foundation(Ref 2021A1515111019)

State Key Laboratory of Physical Chemistry of Solid Surfaces,Xiamen University(2023X11)

Xiamen University Malaysia Investigatorship Grant(IENG/0038)

Xiamen University Malaysia Research Fund(ICOE/0001)

Xiamen University Malaysia Research Fund(XMUMRF/2021-C8/IENG/0041)

Xiamen University Malaysia Research Fund(XMUMRF/2019-C3/IENG/0013)

Hengyuan International Sdn.Bhd(EENG/0003)

出版年

2024

材料科学技术(英文版)

中国金属学会中国材料研究学会中国科学院金属研究所

材料科学技术(英文版)

CSTPCDCSCD

影响因子：0.657

ISSN：1005-0302

参考文献量70

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