Heterogeneous Ni-Fe-P integrated with nickel foam as an efficient and durable electrocatalyst for water oxidation |
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| Affiliation: | 1. CAS Key Laboratory of Design and Assembly of Functional Nanostructures, Fujian Provincial Key Laboratory of Nanomaterials, Fujian Institute of Research on the Structure of Matter, Chinese Academy of Sciences, Fuzhou, Fujian 350002, China;2. University of Chinese Academy of Sciences (UCAS), Beijing 100049, China;1. School of Aeronautics, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;2. School of Energy and Power Engineering, Xi''an Jiaotong University, Xi''an, Shaanxi 710049, China;3. Unmanned Systems Research Institute, Northwestern Polytechnical University, Xi''an, Shaanxi 710072, China;1. Key Laboratory for the Chemistry and Molecular Engineering of Medicinal Resources (Ministry of Education of China), College of Chemistry and Pharmacy, Guangxi Normal University, Guilin 541004, China;2. Saudi Arabia Basic Industries Corporation (SABIC), King Abdullah University of Science and Technology (KAUST), Saudi Arabian;1. Chemistry Department, Faculty of Science, Fayoum University, Fayoum, Egypt;2. Chemistry Department, College of Science & Arts in Qurayat, Jouf University, Saudi Arabia;1. Department of Petrochemical Engineering, College of Chemistry, Chemical Engineering and Environmental Engineering, Liaoning Shihua University, Fushun, 113001, PR China;2. Key Laboratory of High-temperature and High-pressure Study of the Earth''s Interior, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang, 550081, PR China;3. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai, 200093, PR China |
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| Abstract: | Transition metal phosphides represent a class of promising electrocatalysts for electrochemical water oxidization and other energy conversion reactions. In this work, we report a novel seal strategy, followed by a second step phosphorization treatment, produces Ni-Fe-P heterostructure directly grown on nickel foam that shows highly catalytic activity for electrochemical water oxidation. The as-prepared catalyst exhibits an excellent electrocatalytic activity, manifested by a current density of 20 mA cm−2 with a very low overpotential (260 mV) for oxygen evolution reaction along with an extremely small Tafel slope of 27 mV decade−1 and a very excellent durability of 120 h in alkaline solution. The excellent performance with exceptional durability owe much to the synergistic effect between the Ni-Fe-P heterostructure and the outer oxidized layer. Remarkably, a current density of 10 mA cm−2 was reached at a low cell voltage of 1.63 V when the original electrode and surface oxidized electrode are used as cathode and anode, respectively. |
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| Keywords: | Water oxidation Oxygen evolution reaction (OER) Hydrogen evolution reaction (HER) Heterogeneous metal phosphides Overall water splitting |
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