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Nano Research

Article Title

Defective molybdenum sulfide quantum dots as highly active hydrogen evolution electrocatalysts

Authors

Gang Ou, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China
Peixun Fan, Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Xiaoxing Ke, Institute of Microstructure and Property of Advanced Materials, Beijing University of Technology, Beijing 100124, China
Yushuai Xu, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Kai Huang, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Hehe Wei, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Wen Yu, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Hongjun Zhang, Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Minlin Zhong, Laser Materials Processing Research Centre, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Hui Wu, State Key Laboratory of New Ceramics and Fine Processing, School of Materials Science and Engineering, Tsinghua University, Beijing 100084, China
Yadong Li, Department of Chemistry and Collaborative Innovation Center for Nanomaterial Science and Engineering, Tsinghua University, Beijing 100084, China

Keywords

MoS2, quantum dots, defects, hydrogen evolution, ultrafast laser ablation

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.

Graphical Abstract

Publisher

Tsinghua University Press

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