Stable and highly efficient MoS2/Si NWs hybrid heterostructure for photoelectrocatalytic hydrogen evolution reaction |
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| Affiliation: | 1. Centre for Nanoscience and Nanotechnology, Department of Physics, Bharathidasan University, Tiruchirappalli, 620 024, Tamil Nadu, India;2. Department of Physics, Sri S. Ramasamy Naidu Memorial College, Sattur, 626 203, Tamil Nadu, India;1. School of Mechatronic Engineering, Xi''an Technological University, Xi''an, 710021, China;2. Department of Electrical Engineering, University of Bonab, Bonab, Iran;3. Social Research Institute, Chulalongkorn University, Bangkok, 10330, Thailand;1. Eskisehir Technical University, Faculty of Science, Department of Physics, Yunusemre Campus, 26470 Tepebasi, Eskisehir, Turkey;2. Central Research Laboratory, Eskisehir Osmangazi University, Eskisehir, Turkey;1. Department of Physics, Sri SRNM College, Sattur 626 203, Tamil Nadu, India;2. Department of Physics, Sethu Institute of Technology, Kariapatti 626 115, Tamil Nadu, India;3. Department of Physics, School of Advanced Sciences, VIT University, Vellore 632 014, Tamil Nadu, India;1. Czestochowa University of Technology, Faculty of Production Engineering and Materials Technology, Al. Armii Krajowej 19, 42-200, Czestochowa, Poland;2. Trzebiatowski Institute of Low Temperatures and Structure Research PAS, Okolna Str. 2 P.O. Box 1410, 50-950, Wrocław, Poland |
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| Abstract: | We report, the fabrication of molybdenum disulphide (MoS2) wrapped silicon nanowires (Si NWs) for visible light driven water splitting applications. The morphological and elemental studies ensure the vertical alignment of Si NWs wrapped with 2D layered MoS2. The photoelectrocatalytic (PEC) results evidence the significant enhancement in performance of MoS2/Si NWs based hybrid photocathode with ~300 mV (under reversible hydrogen electrode (RHE)) anodic shift in onset potential as that of pristine Si NWs (+0.194 V vs. RHE), and the current density of −26.5 mA/cm2 was achieved at the applied bias of 0 V vs. RHE. Further, the electrochemical impedance studies ensure the interface resistance-free charge transfer between Si NWs and electrolyte via 2D MoS2 layer which provokes rapid hydrogen production. The wrapping of Si NWs with MoS2 protects the superlative photocathode from harsh acid electrolyte environment. The overgrown MoS2 triangular particles with active sulphur edge sites are found to eventually augment the solar hydrogen evolution rate. Further, the PEC performance of our MoS2/Si NWs is also comparable with stable Pt/Si NWs photoelectrode. It is note-worthy that, MoS2/Si NWs hybrid heterostructure would be a potential candidate in future large scale, low cost and day-to-day solar water splitting applications. |
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| Keywords: | Solar water splitting Silicon nanowires 2D materials Chemical vapour deposition Metal assisted chemical etching (MACE) |
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