Atomic-scale intercalation of amorphous MoS2 nanoparticles into N-doped carbon as a highly efficient electrocatalyst for hydrogen evolution reaction |
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| Affiliation: | 1. School of Chemical Engineering and Materials Science, Quanzhou Normal University, Quanzhou, Fujian, 362000, China;2. Department of Physics, City University of Hong Kong, Tat Chee Avenue, Kowloon, Hong Kong, China;3. School of Materials Science and Engineering and Tianjin Key Laboratory of Composites and Functional Materials, Tianjin University, Tianjin, 300072, China;1. School of Physical Science and Technology, Southwest Jiaotong University, Key Laboratory of Advanced Technology of Materials, (Ministry of Education), Chengdu, 610031, People’s Republic of China;2. State Key Laboratory of Electronic Thin Film and Integrated Devices, University of Electronic Science and Technology of China, Chengdu, 610054, People’s Republic of China;3. Superconductivity and New Energy R & D Center, Southwest Jiaotong University, 610031, People’s Republic of China;1. Nanomaterials for Emerging Solid State Technology (NEST) Research Laboratory, Department of Physics, Cochin University of Science and Technology, Kochi, Kerala, 682022, India;2. Centre of Excellence in Advanced Materials, Cochin University of Science and Technology, Cochin, Kerala, 682022, India |
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| Abstract: | The hydrogen evolution reaction (HER) properties of the catalysts are significantly dependent on their microscopic structure. Interfacial engineering at the atomic level is the main approach to design high performance of electrocatalysts. Herein, an interfacial modulation strategy is proposed to fabricate monolayer amorphous MoS2 nanoparticles with an average of 3.5 nm in diameter stuck in multilayer N-doped carbon (MoS2/NC), boosting a high HER activity. The amorphous MoS2 could provide more edge active sites and NC layers endow the fast electron transfer. The XPS, Raman spectra and density functional theory (DFT) calculations reveal that the C–S bond in MoS2/NC provides the fast electron transfer and decreases H binding energy. Benefiting the unique sandwiched structure, the MoS2/NC boosts a low overpotential of 152.6 mV at a current density of 10 mA cm?2, a small Tafel slope of 60.3 mV dec?1, and outstanding long-term stability with 97.3% retention for over 24 h. This strategy provides a new opportunity and development of interfacial engineering for turning intrinsic catalytic activity for water splitting. |
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| Keywords: | NC nanobelts Layer-by-layer Electrocatalysts Hydrogen evolution reaction |
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