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Surface Engineering of MoS 2 via Laser‐Induced Exfoliation in Protic Solvents
Author(s) -
Gao ZhiWen,
Liu Mengjie,
Zheng Weiran,
Zhang Xiandi,
Lee Lawrence Yoon Suk
Publication year - 2019
Publication title -
small
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 3.785
H-Index - 236
eISSN - 1613-6829
pISSN - 1613-6810
DOI - 10.1002/smll.201903791
Subject(s) - tafel equation , overpotential , molybdenum disulfide , exfoliation joint , materials science , catalysis , formic acid , molybdenum , phase (matter) , irradiation , metal , laser , solvent , chemical engineering , graphene , inorganic chemistry , nanotechnology , chemistry , electrochemistry , organic chemistry , metallurgy , physics , electrode , engineering , optics , nuclear physics
With excellent performance in the hydrogen evolution reaction (HER), molybdenum disulfide (MoS 2 ) is considered a promising nonprecious candidate to substitute Pt‐based catalysts. Herein, pulsed laser irradiation in liquid is used to realize one‐step exfoliation of bulk 2H‐MoS 2 to ultrastable few‐layer MoS 2 nanosheets. Such prepared MoS 2 nanosheets are rich in S vacancies and metallic 1T phase, which significantly contribute to the boosted catalytic HER activity. Protic solvents play a pivotal role in the production of S vacancies and 2H‐to‐1T phase transition under laser irradiation. MoS 2 exfoliated in an optimal solvent of formic acid exhibits outstanding HER activity with an overpotential of 180 mV at 10 mA cm −2 and Tafel slope of 54 mV dec −1 .