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Nano Research

Article Title

Unsaturated-sulfur-rich MoS2 nanosheets decorated on free-standing SWNT film: Synthesis, characterization and electrocatalytic application

Authors

Daobin Liu, National Synchrotron Radiation Laboratory, CAS Hefei Science Center, University of Science and Technology of China, Hefei 230029, China
Weiyu Xu, National Synchrotron Radiation Laboratory, CAS Hefei Science Center, University of Science and Technology of China, Hefei 230029, China
Qin Liu, National Synchrotron Radiation Laboratory, CAS Hefei Science Center, University of Science and Technology of China, Hefei 230029, China
Qun He, National Synchrotron Radiation Laboratory, CAS Hefei Science Center, University of Science and Technology of China, Hefei 230029, China
Yasir A. Haleem, National Synchrotron Radiation Laboratory, CAS Hefei Science Center, University of Science and Technology of China, Hefei 230029, China
Changda Wang, National Synchrotron Radiation Laboratory, CAS Hefei Science Center, University of Science and Technology of China, Hefei 230029, China
Ting Xiang, National Synchrotron Radiation Laboratory, CAS Hefei Science Center, University of Science and Technology of China, Hefei 230029, China
Chongwen Zou, National Synchrotron Radiation Laboratory, CAS Hefei Science Center, University of Science and Technology of China, Hefei 230029, China
angsheng Chu, National Synchrotron Radiation Laboratory, CAS Hefei Science Center, University of Science and Technology of China, Hefei 230029, China
Jun Zhong, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials Laboratory (FUNSOM), Soochow University, Suzhou 215123, China
Zhiqiang Niu, Jiangsu Key Laboratory for Carbon-Based Functional Materials & Devices, Institute of Functional Nano & Soft Materials Laboratory (FUNSOM), Soochow University, Suzhou 215123, China
Li Song, National Synchrotron Radiation Laboratory, CAS Hefei Science Center, University of Science and Technology of China, Hefei 230029, China Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), College of Chemistry, Collaborative Innovation Center of Chemical Science and Engineering, Nankai University, Tianjin 300071, China

Keywords

unsaturated-sulfur-rich, MoS2, flexible, X-ray absorption near-edgestructure, hydrogen evolution

Abstract

Herein, we report a bottom-up solvothermal route to synthesize a flexible, highlyefficient MoS2@SWNT electrocatalyst for hydrogen evolution reactions (HER).Characterization revealed that branch-like MoS2 nanosheets containing sulfurrichsites were in situ uniformly dispersed on free-standing single-walled carbonnanotube (SWNT) film, which could expose more unsaturated sulfur atoms,allowing excellent electrical contact with active sites. The flexible catalyst exhibitedexcellent HER performance with a low overpotential (~150 mV at 10 mA/cm2) andsmall Tafel slope (41 mV/dec). To further explain the improved performance,the local electronic structure was investigated by X-ray absorption near-edgestructure (XANES) analysis, proving the presence of unsaturated sulfur atomsand strong electronic coupling between MoS2 and SWNT. This study providesan in-situ synthetic route to create new multifunctional flexible hybridized catalystsand useful insights into the relationships among the catalyst microstructure,electronic structure, and properties.

Graphical Abstract

Publisher

Tsinghua University Press

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