Unsaturated-sulfur-rich MoS2 nanosheets decorated on free-standing SWNT film: Synthesis, characterization and electrocatalytic application
unsaturated-sulfur-rich, MoS2, flexible, X-ray absorption near-edgestructure, hydrogen evolution
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.
Tsinghua University Press
Daobin Liu,Weiyu Xu,Qin Liu,Qun He,Yasir A. Haleem,Changda Wang,Ting Xiang,Chongwen Zou,Wangsheng Chu,Jun Zhong,Zhiqiang Niu,Li Song, Unsaturated-sulfur-rich MoS2 nanosheets decorated on free-standing SWNT film: Synthesis, characterization and electrocatalytic application. NanoRes.2016, 9(7): 2079–2087