S-doping induced phase engineering of MoSe2 for hydrogen evolution reaction |
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| Affiliation: | 1. Key Laboratory of Materials Physics, Institute of Solid State Physics, HFIPS,Chinese Academy of Sciences, Hefei 230031, People''s Republic of China;2. University of Science and Technology of China, Hefei 230026, People''s Republic of China;3. High Magnetic Field Laboratory, HFIPS, Chinese Academy of Sciences, Hefei 230031, People''s Republic of China;4. Collaborative Innovation Center of Advanced Microstructures, Nanjing University, Nanjing 210093, People''s Republic of China |
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| Abstract: | MoSe2 is a promising electrocatalyst for hydrogen evolution reaction (HER). It is confirmed that 1T-MoSe2 shows better activity for HER compared with 2H-MoSe2 since of wider interlayer spacing, higher conductivity and better hydrophilicity of 1T-MoSe2. Realization of 1T-MoSe2 is still a thorny issue due to its high formation barrier and thermodynamic metastable. Herein, considering the microstrain induced by atomic size mismatch through the substitution of Se by S, the MoSe2-2xS2x is prepared via one-pot hydrothermal synthesis, resulting in 70.3% high-purity 1T phase. Additionally, the MoSe2-2xS2x shows a low overpotential of 167 mV at 10 mA cm?2, Tafel slope of 54 mV dec?1, high double layer capacitance (Cdl) of 13.43 mF cm?2 and superior cycle stability. The results are ascribed to larger interlayer spacing, high conductivity and good hydrophilicity of 1T phase MoSe2-2xS2x. This study provides a simple and feasible route to achieve high-purity TMDs for promoting HER application. |
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| Keywords: | Phase engineering Microstrain Hydrothermal Hydrogen evolution reaction |
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