Iron‐nickel hydroxide nanoflake arrays supported on nickel foam with dramatic catalytic properties for the evolution of oxygen at high current densities

Summary Ultrathin FeNiOxHy nanoflake arrays with the thickness of only ~4.5 nm were prepared on Ni foam (NF) via a facile hydrothermal reaction. The oxygen evolution reaction (OER) properties of the obtained sample (FeNiOxHy/NF) were investigated under alkaline conditions (1.0 M KOH). The optimized...

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Bibliographic Details
Published in:International journal of energy research 2020-09, Vol.44 (11), p.9222-9232
Main Authors: Hu, Hua‐Shuai, Si, Si, Liu, Rui‐Jie, Wang, Chong‐Bin, Feng, Yuan‐Yuan
Format: Article
Language:English
Subjects:
Arrays
Attenuation
Catalysts
Catalytic activity
Current density
Durability
electrocatalyst
Electrolysis
Evolution
Heavy metals
High current
high current density
Hydrothermal reactions
hydroxide
Hydroxides
Industrial water
iron
Metal foams
nanoflake array
Nickel
Oxidation
Oxygen
oxygen evolution reaction
Oxygen evolution reactions
Properties
Stability
Stability tests
Substrates
Synergistic effect
Transition metals
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Summary:Summary Ultrathin FeNiOxHy nanoflake arrays with the thickness of only ~4.5 nm were prepared on Ni foam (NF) via a facile hydrothermal reaction. The oxygen evolution reaction (OER) properties of the obtained sample (FeNiOxHy/NF) were investigated under alkaline conditions (1.0 M KOH). The optimized FeNiOxHy/NF displays extremely small overpotentials of only 195 and 306 mV to achieve the current densities of 10 and 1000 mA cm−2, respectively, and shows almost no potential attenuation during the 160 hours of stability test even the current density is up to 1000 mA cm−2, demonstrating brilliant OER catalytic activity and durability. FeOOH and the NiOOH produced from the in situ oxidation of the surface Ni atoms of the NF substrate are the active sites. The synergistic effect between FeOOH and NiOOH is responsible for the high performances. To our knowledge, the high activity and stability of FeNiOxHy/NF catalyst outperform almost all of the OER catalysts reported to date. These informative findings are valuable not only for understanding the mechanism of OER but also for the design of cheap transition metal catalysts for industrial water electrolysis at high current densities. Iron‐nickel hydroxide nanoflake arrays with excellent performances for oxygen evolution reaction at high current densities.
ISSN:0363-907X
1099-114X
DOI:10.1002/er.5636