Journal
INTERNATIONAL JOURNAL OF HYDROGEN ENERGY
Volume 45, Issue 28, Pages 14199-14207Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijhydene.2019.11.007
Keywords
Bifunctional; Ni foam; Electrocatalysis; Hydrogen evolution reaction; Urea oxidation reaction
Categories
Funding
- Key Laboratory of Bio-inspired Materials and Interfacial Science, TICP, CAS
- Key projects of science and technology research in Hebei higher education institutions [ZD2018311]
- Xingtai science and technology program [2018ZC031, 2018ZC227]
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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 Ni-3 N-350/NF as cathode and anode respectively. Ni3N-350/NF parallel to 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. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.
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