Journal
NANO RESEARCH
Volume 9, Issue 7, Pages 2079-2087Publisher
TSINGHUA UNIV PRESS
DOI: 10.1007/s12274-016-1098-6
Keywords
unsaturated-sulfur-rich; MoS2; flexible; X-ray absorption near-edge structure; hydrogen evolution
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Funding
- National Basic Research Program of China [2014CB848900]
- National Natural Science Foundation of China [U1232131, U1532112, 11375198, 11574280]
- Fundamental Research Funds for the Central Universities [WK2310000053]
- CAS Hefei Science Center [2015HSC-UP020]
- Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University
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Herein, we report a bottom-up solvothermal route to synthesize a flexible, highly efficient MoS2@SWNT electrocatalyst for hydrogen evolution reactions (HER). Characterization revealed that branch-like MoS2 nanosheets containing sulfurrich sites were in situ uniformly dispersed on free-standing single-walled carbon nanotube (SWNT) film, which could expose more unsaturated sulfur atoms, allowing excellent electrical contact with active sites. The flexible catalyst exhibited excellent HER performance with a low overpotential (similar to 150 mV at 10 mA/cm(2)) and small Tafel slope (41 mV/dec). To further explain the improved performance, the local electronic structure was investigated by X-ray absorption near-edge structure (XANES) analysis, proving the presence of unsaturated sulfur atoms and strong electronic coupling between MoS2 and SWNT. This study provides an in-situ synthetic route to create new multifunctional flexible hybridized catalysts and useful insights into the relationships among the catalyst microstructure, electronic structure, and properties.
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