Surface Engineering of MoS2 via Laser-Induced Exfoliation in Protic Solvents

Zhi Wen Gao; Mengjie Liu; Weiran Zheng; Xiandi Zhang; Lawrence Yoon Suk Lee

doi:10.1002/smll.201903791

Surface Engineering of MoS₂ via Laser-Induced Exfoliation in Protic Solvents

Zhi Wen Gao, Mengjie Liu, Weiran Zheng, Xiandi Zhang, Lawrence Yoon Suk Lee^*

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

29 Scopus citations

Abstract

With excellent performance in the hydrogen evolution reaction (HER), molybdenum disulfide (MoS₂) 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-MoS₂ to ultrastable few-layer MoS₂ nanosheets. Such prepared MoS₂ 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. MoS₂ 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.

Original language	English
Article number	1903791
Journal	Small
Volume	15
Issue number	44
DOIs	https://doi.org/10.1002/smll.201903791
State	Published - 1 Oct 2019
Externally published	Yes

Keywords

laser exfoliation in liquid
molybdenum disulfide
phase transition
solvent effect
sulfur vacancy

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10.1002/smll.201903791

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title = "Surface Engineering of MoS2 via Laser-Induced Exfoliation in Protic Solvents",

abstract = "With excellent performance in the hydrogen evolution reaction (HER), molybdenum disulfide (MoS2) 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-MoS2 to ultrastable few-layer MoS2 nanosheets. Such prepared MoS2 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. MoS2 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.",

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author = "Gao, {Zhi Wen} and Mengjie Liu and Weiran Zheng and Xiandi Zhang and Lee, {Lawrence Yoon Suk}",

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doi = "10.1002/smll.201903791",

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T1 - Surface Engineering of MoS2 via Laser-Induced Exfoliation in Protic Solvents

AU - Gao, Zhi Wen

AU - Liu, Mengjie

AU - Zheng, Weiran

AU - Zhang, Xiandi

AU - Lee, Lawrence Yoon Suk

PY - 2019/10/1

Y1 - 2019/10/1

N2 - With excellent performance in the hydrogen evolution reaction (HER), molybdenum disulfide (MoS2) 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-MoS2 to ultrastable few-layer MoS2 nanosheets. Such prepared MoS2 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. MoS2 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.

AB - With excellent performance in the hydrogen evolution reaction (HER), molybdenum disulfide (MoS2) 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-MoS2 to ultrastable few-layer MoS2 nanosheets. Such prepared MoS2 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. MoS2 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.

KW - laser exfoliation in liquid

KW - molybdenum disulfide

KW - phase transition

KW - solvent effect

KW - sulfur vacancy

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Surface Engineering of MoS₂ via Laser-Induced Exfoliation in Protic Solvents

Abstract

Keywords

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