Monolayer MoS2 quantum dots as catalysts for efficient hydrogen evolution

Wen Qiao; Shiming Yan; Xueyin Song; Xing Zhang; Yuan Sun; Xing Chen; Wei Zhong; Youwei Du

doi:10.1039/C5RA19893C

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Monolayer MoS₂ quantum dots as catalysts for efficient hydrogen evolution†

Wen Qiao,^a Shiming Yan,^ab Xueyin Song,^a Xing Zhang,^a Yuan Sun,^a Xing Chen,^a Wei Zhong*^a and Youwei Du^a

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* Corresponding authors

^a Collaborative Innovation Center of Advanced Microstructures, National Laboratory of Solid State Microstructures, Jiangsu Provincial Laboratory for NanoTechnology, Nanjing University, Nanjing, China
E-mail: wzhong@nju.edu.cn

^b College of Science, Henan University of Technology, Zhengzhou 450001, P. R. China

Abstract

Monolayer MoS₂ quantum dots (QDs) with lateral size around 3 nm were prepared through an effective multi-exfoliation based on lithium (Li) intercalation. The effects of the number of exfoliation on the microstructures and electrocatalytic activities of hydrogen evolution reaction (HER) for MoS₂ nanosheets were examined. The lateral size of the nanosheets decreases rapidly with increasing the number of exfoliation. The obtained monolayer MoS₂ QDs exhibit improved HER catalytic activities with a low overpotential of approximately 120 mV and a relatively small Tafel slope of 69 mV dec⁻¹. Both the ultrathin structure and the abundance of exposed active edge sites make monolayer MoS₂ QDs a promising HER electrocatalyst for practical application.

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Article information

DOI: https://doi.org/10.1039/C5RA19893C
Article type: Paper
Submitted: 26 Sep 2015
Accepted: 03 Nov 2015
First published: 09 Nov 2015

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RSC Adv., 2015,5, 97696-97701

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Monolayer MoS₂ quantum dots as catalysts for efficient hydrogen evolution

W. Qiao, S. Yan, X. Song, X. Zhang, Y. Sun, X. Chen, W. Zhong and Y. Du, RSC Adv., 2015, 5, 97696 DOI: 10.1039/C5RA19893C

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