Hatted 1T/2H-Phase MoS2 on Ni3S2 Nanorods for Efficient Overall Water Splitting in Alkaline Media |
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| Authors: | Yang Zhao Prof?Dr Shizhong Wei Feihong Wang Prof?Dr Liujie Xu Prof?Dr Yong Liu Prof?Dr Junpin Lin Prof?Dr Kunming Pan Prof?Dr Huan Pang |
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| Institution: | 1. State Key laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing, 100083 P.R. China;2. Henan Key Laboratory of High-temperature Structural and Functional Materials & National Joint Engineering Research Center for, Abrasion Control and Molding of Metal Materials, Henan University of Science and Technology, Luoyang, 471003 P.R. China;3. School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, 225002 P.R. China |
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| Abstract: | A new hatted 1T/2H-phase MoS2 on Ni3S2 nanorods, as a bifunctional electrocatalyst for overall water splitting in alkaline media, is prepared through a simple one-pot hydrothermal synthesis. The hat-rod structure is composed mainly of Ni3S2, with 1T/2H-MoS2 adhered to the top of the growth. Aqueous ammonia plays an important role in forming the 1T-phase MoS2 by twisting the 2H-phase transition and expanding the interlayer spacing through the intercalation of NH3/NH4+. Owing to the special “hat-like” structure, the electrons conduct easily from Ni foam along Ni3S2 to MoS2, and the catalyst particles maintain sufficient contact with the electrolyte, with gaseous molecules produced by water splitting easily removed from the surface of the catalyst. Thus, the electrocatalytic performance is enhanced, with an overpotential of 73 mV, a Tafel slope of 79 mV dec?1, and excellent stability, and the OER demonstrates an overpotential of 190 mV and Tafel slope of 166 mV dec?1. |
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| Keywords: | bifunctional electrocatalysts electrochemistry hatted nanorods hydrothermal synthesis nanostructures water splitting |
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