Porous flower-like nickel nitride as highly efficient bifunctional electrocatalysts for less energy-intensive hydrogen evolution and urea oxidation |
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| Affiliation: | 1. MIIT Key Laboratory of Dynamics and Control of Complex Systems, School of Mechanics, Civil Engineering and Architecture, Northwestern Polytechnical University, 127 West Youyi Road, Beilin District, Xi''an, Shanxi, 710072, People''s Republic of China;2. School of Chemistry and Chemical Engineering, Harbin Institute of Technology, Harbin 150001, People''s Republic of China;3. Key Laboratory of Micro-systems and Micro-structures Manufacturing, Harbin Institute of Technology, No.2 Yikuang Street, Nan Gang District, Harbin 150080, People''s Republic of China;4. The First Affiliated Hospital, Jiamusi University, No.258 Xuefu Street, Jiamusi, 154007, People''s Republic of China;5. School of Life Science and Technology, Harbin Institute of Technology, No.92 West Dazhi Street, Nan Gang District, Harbin 150001, People''s Republic of China |
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| Abstract: | Finding a suitable replacement for the high potential of anodic water electrolysis (oxygen evolution reaction (OER)) is significant for hydrogen energy storage and conversion. In this work, a simple and scalable method synthesizes a structurally unique Ni3N nanoarray on Ni foam, Ni3N-350/NF, that provides efficient electrocatalysis for the urea oxidation reaction (UOR) that transports 10 mA cm?2 at a low potential of 1.34 V. In addition, Ni3N-350/NF exhibits electro-defense electrocatalytic performance for hydrogen evolution reaction, which provides a low overpotential of 128 mV at 10 mA cm?2. As proof of concept, all-water-urea electrolysis measurement is carried out in 1 M KOH with 0.5 M Urea with Ni3N-350/NF as cathode and anode respectively. Ni3N-350/NF||Ni3N-350/NF electrode can provide 100 mA cm?2 at a voltage of only 1.51 V, 160 mV less than that of water electrolysis, which proves its commercial viability in energy-saving hydrogen production. |
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| Keywords: | Bifunctional Ni foam Electrocatalysis Hydrogen evolution reaction Urea oxidation reaction |
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