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Research Article

Defective molybdenum sulfide quantum dots as highly active hydrogen evolution electrocatalysts

Gang Ou1,2,§, Peixun Fan3,§, Xiaoxing Ke4, Yushuai Xu1, Kai Huang1, Hehe Wei1, Wen Yu1, Hongjun Zhang3, Minlin Zhong3( ), Hui Wu1( ), Yadong Li2
State Key Laboratory of New Ceramics and Fine ProcessingSchool of Materials Science and EngineeringTsinghua UniversityBeijing100084China
Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and EngineeringTsinghua UniversityBeijing100084China
Laser Materials Processing Research CentreSchool of Materials Science and EngineeringTsinghua UniversityBeijing100084China
Institute of Microstructure and Property of Advanced MaterialsBeijing University of TechnologyBeijing100124China

§ Gang Ou and Peixun Fan contributed equally to this work.

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Graphical Abstract

Abstract

Molybdenum disulfide (MoS2), a promising non-precious electrocatalyst for the hydrogen evolution reaction with two-dimensional layered structure, has received increasing attention in recent years. Its electrocatalytic performance has been limited by the low active site content and poor conductivity. Herein, we report a facile and general ultrafast laser ablation method to synthesize MoS2 quantum dots (MS-QDs) for electrocatalytic HER with fully exposed active sites and highly enhanced conductivity. The MS-QDs were prepared by ultrafast laser ablation of the corresponding bulk material in aqueous solution, during which they were partially oxidized and formed defective structures. The as-prepared MS-QDs demonstrated high activity and stability in the electrocatalytic HER, owing to their very large surface area, defective structure, abundance of active sites, and high conductivity. The present MS-QDs can also find application in optics, sensing, energy storage, and conversion technologies.

Keywords

MoS2quantum dotsdefectshydrogen evolutionultrafast laser ablation

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Nano Research
Volume 11 Issue 2,
February 2018
Pages 751-761
DOI: 10.1007/s12274-017-1684-2
Cite this article:
Ou G, Fan P, Ke X, et al. Defective molybdenum sulfide quantum dots as highly active hydrogen evolution electrocatalysts. Nano Research, 2018, 11(2): 751-761. https://doi.org/10.1007/s12274-017-1684-2

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Received: 30 March 2017
Revised: 15 May 2017
Accepted: 16 May 2017
Published: 27 July 2017
© Tsinghua University Press and Springer-Verlag GmbH Germany 2017
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