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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Metal substrates activate NiFe(oxy)hydroxide catalysts for efficient oxygen evolution reaction in alkaline media

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Title
Metal substrates activate NiFe(oxy)hydroxide catalysts for efficient oxygen evolution reaction in alkaline media
Author
Kim, Young KyeongJun, Woo TaeYoun, Duck HyunLee, Jae Sung
Issue Date
2022-04
Publisher
ELSEVIER SCIENCE SA
Citation
JOURNAL OF ALLOYS AND COMPOUNDS, v.901, pp.163689
Abstract
The amorphous NiFeOx(OH)(y) is synthesized on Fe, Ni, and Cu foam substrates to study the effects of the metal substrates on activity and stability for the electrochemical oxygen evolution reaction (OER) from water. The metal substrate for NiFeOx(OH)(y) catalyst does not merely perform the physical role of loading the catalyst, but actively participates in the activation process of the catalyst phase by controlling the charge transfer during the OER. The Ni foam substrate is found to be the best to make NiFeOx(OH)(y)/Ni foam the most active and the most stable electrode for OER in an alkaline medium due to its multiple functions. The nickel substrate forms the thinnest oxide layer on its surface to allow facile charge transfer, and stabilizes the M-O-x(OH)(y) structure of high oxidation degree of metals and balanced O-x/(OH)(y) responsible for excellent OER performance. The high intrinsic corrosion resistance of Ni and its ability to stabilize a thick layer of M-O-x(OH)(y) structure can also minimize the metal dissolution during the OER and provide superior long-term stability. Finally, oxidation of the Ni substrate itself results in more NiOOH phase formation to achieve an optimum NiFe composition. (C) 2022 Elsevier B.V. All rights reserved.
URI
https://scholarworks.unist.ac.kr/handle/201301/57247
URL
https://www.sciencedirect.com/science/article/pii/S0925838822000809?via%3Dihub
DOI
10.1016/j.jallcom.2022.163689
ISSN
0925-8388
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