Super-hydrophilic/super-aerophobic Ni2P/Co(PO3)2 heterostructure for high-efficiency and durable hydrogen evolution electrocatalysis at large current density in alkaline fresh water,alkaline seawater and industrial wastewater |
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| Affiliation: | 1. Inner Mongolia Key Laboratory of Chemistry and Physics of Rare Earth Materials, College of Chemistry and Chemical Engineering, Inner Mongolia University, 24 Zhaojun Road, Hohhot 010021, PR China;2. College of Chemistry and Chemical Engineering, Inner Mongolia University, 24 Zhaojun Road, Hohhot 010021, PR China;1. Research Institute of Macro-Safety Science, University of Science and Technology Beijing, Beijing, 100083, China;2. School of Safety Engineering & Hydrogen Energy Research Centre, Beijing Institute of Petrochemical Technology, Beijing, 102617, China;3. State Key Laboratory of Explosion Science and Technology, Beijing Institute of Technology, Beijing, 100081, China;1. Department of Automobile Engineering, College of Engineering and Technology, SRM Institute of Science and Technology, Chengalpattu, 603203, Tamil Nadu, India;2. Department of Mechanical Engineering, College of Engineering Guindy, Anna University, Chennai, 600025, Tamil Nadu, India;1. Key Laboratory of Photonic and Electronic Bandgap Materials, Ministry of Education, Harbin Normal University, Harbin 150025, PR China;2. Key Laboratory of Synthesis of Functional Materials and Green Catalysis, Colleges of Heilongjiang Province, Harbin Normal University, Harbin 150025, PR China;3. Key Laboratory of Remote Sensing Monitoring of Geographic Environment, Colleges of Heilongjiang Province, Harbin Normal University, Harbin 150025, PR China;1. School of Energy, Power and Mechanical Engineering, North China Electric Power University, Beijing, China;2. National Thermal Power Engineering & Technology Research Center, North China Electric Power University, Beijing, China;3. State Key Laboratory of Alternate Electric Power System with Renewable Energy Source, North China Electric Power University, Beijing, China;4. Key Laboratory of Power Station Energy Transfer Conversion and System (Ministry of Education), North China Electric Power University, Beijing, 102206, China;5. Department of Energy, Systems, Territory and Constructions Engineering, University of Pisa, Pisa, Italy;1. School of Chemical Engineering, Nanjing University of Science and Technology, 200 Xiao Ling Wei Street, Nanjing, Jiangsu Province, China;2. Jiangsu Key Laboratory for Pharmacology and Safety Evaluation of Chinese Materia Medica, Department of Pharmacy, Nanjing University of Chinese Medicine, 138 Xianlin Avenue, Qixia District, Nanjing, Jiangsu, 210023, China;3. Nanjing Fiberglass Research and Design Institute Co., Ltd., Yuhua Andeli 30 West Road, Nanjing, Jiangsu 210012, China |
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| Abstract: | Seawater electrolysis has become an efficient method which makes full use of natural resources to produce hydrogen. However, it suffers high energy cost and chloride corrosion. Herein, we first present a Ni2P/Co(PO3)2/NF heterostructure in which Co(PO3)2 with the nano-rose morphology in-situ grown on the rough Ni2P/NF. The unique 3D nano-rose structure and the optimized electronic structure of the heterostructure enable Ni2P/Co(PO3)2/NF super-hydrophilic and super-aerophobic characteristics, and highly facilitate hydrogen evolution reaction (HER) kinetics in alkaline fresh water, alkaline seawater and even industrial wastewater at large current density, which is rarely reported. Significantly, at large current densities, Ni2P/Co(PO3)2/NF only requires overpotentials of 217 and 307 mV for HER to achieve 1000 mA cm−2 in alkaline fresh water and alkaline seawater, respectively, and requires an overpotential of 469 mV for HER to deliver 500 mA cm−2 in industrial wastewater. Furthermore, the overall seawater splitting system in the two-electrode electrolyzer only requires voltage of 1.98 V to drive 1000 mA cm−2, which also demonstrates significant durability to keep 600 mA cm−2 for at least 60 h. This study opens a new avenue of designing high efficiency electrocatalysts for hydrogen production at large current densities in alkaline seawater and industrial wastewater. |
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| Keywords: | Super-hydrophilicity and super-aerophobicity Hydrogen evolution reaction Alkaline seawater Large-current-density |
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