Ni(OH)2/ NiSe2 hybrid nanosheet arrays for enhanced alkaline hydrogen evolution reaction |
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| Affiliation: | 1. School of Materials Science and Engineering, Hebei University of Technology, Tianjin 300132, PR China;2. School of Materials Science and Engineering, Tianjin University, Tianjin 300072, PR China;3. Hebei Key Laboratory of Boron Nitride Micro and Nano Materials, Hebei University of Technology, Tianjin 300132, PR China;1. Department of Physics and TcSUH, University of Houston, Houston, TX 77204, United States;2. Department of Physics and Engineering Physics, Morgan State University, Baltimore, MD 21251, United States;3. Beijing National Laboratory for Condensed Matter Physics, Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China;1. Key Laboratory of Artificial Micro- and Nano-structures of Ministry of Education of China, School of Physics and Technology, Wuhan University, Wuhan, 430072, PR China;2. School of Physics and Electronic sciences, Hubei Normal University, Huangshi, 435002, PR China;1. CAS Center for Excellence in Nanoscience, Key Laboratory of Nanosystem and Hierarchical Fabrication, National Center for Nanoscience and Technology (NCNST), Beijing 100190, PR China;2. University of Chinese Academy of Sciences, Beijing 100049, PR China;1. State Key Laboratory of Advanced Welding and Joining, Harbin Institute of Technology, Harbin, 150001, China;2. School of Materials Science and Engineering, Harbin Institute of Technology, Harbin, China;3. Key Laboratory of Functional Materials Physics and Chemistry of the Ministry of Education, Jilin Normal University, Siping, 136000, China |
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| Abstract: | Developing efficient, non-noble electrocatalysts toward hydrogen evolution reaction (HER) in alkaline electrolytes is of important significance for future energy supplement but still a challenge. Recently, pyrite-type NiSe2 nanomaterial has been considered as an idea HER electrocatalyst due to its high conductivity, strong corrosion resistance and low cost. However, the HER performance of NiSe2 in alkaline electrolytes is still unsatisfactory, which is possibly limited to the activate water dissociation in alkaline media. Herein, a novel hybrid electrocatalyst of Ni(OH)2/NiSe2 nanosheet arrays on carbon cloth (Ni(OH)2/NiSe2/CC) is fabricated, exhibiting excellent HER catalytic activity with a low overpotential of 82 mV to drive a current density of 10 mAcm−2 as well as maintaining a long-term durability for 12 h in 1.0 M KOH, which is 77 mV less than that of NiSe2/CC and superior to most recently reported non-noble HER electrocatalysts. In addition, the Tafel slope of Ni(OH)2/NiSe2/CC (60 mV dec −1) is also much smaller than that of NiSe2/CC (112 mV dec −1), suggesting a promotion kinetics of HER process for Ni(OH)2/NiSe2/CC. Our further experimental results show that the significantly improved activity of Ni(OH)2/NiSe2/CC electrode should ascribe to its enlarged active surface, good conductivity and interfacial synergy between Ni(OH)2 and NiSe2. The synergetic strategy may provide an efficient way to promote the HER activity of other non-noble transition metal selenides in alkaline electrolyte. |
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| Keywords: | Alkaline hydrogen evolution reaction Nanosheet arrays Synergic effect Water dissociation promoter |
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