Deep reconstruction of highly disordered iron/nickel nitrate hydroxide nanoplates for high-performance oxygen evolution reaction in alkaline media

Rational design of FeNi based electrocatalysts with robust OER activity and stability is of great significance for promising water electrolysis. In this work, in-situ growth of highly disordered iron-nickel nitrate hydroxide (FeNiNH) nanoplates on nickel foam via a simple one-pot solvothermal method...

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Bibliographic Details
Published in:Journal of alloys and compounds 2022-12, Vol.927, p.167060, Article 167060
Main Authors: Liu, Jinghua, He, Xiong, Wang, Yaoyao, Sun, Zijun, Liu, Yansheng, Liu, Baosheng, Li, Hongda, Guo, Fei, Li, Xin
Format: Article
Language:English
Subjects:
Disorder
Electrocatalysts
Electrolysis
Electronic structure
FeNi based electrocatalysts
In situ leaching
Iron
Leaching
Metal foams
Nickel
Nitrate hydroxide
OER
Oxygen evolution reactions
Phase transitions
Reconstruction
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Summary:Rational design of FeNi based electrocatalysts with robust OER activity and stability is of great significance for promising water electrolysis. In this work, in-situ growth of highly disordered iron-nickel nitrate hydroxide (FeNiNH) nanoplates on nickel foam via a simple one-pot solvothermal method is demonstrated. The highly disordered FeNiNH exhibits coexistence of amorphous and crystal microstructure, providing more active sites from boundaries, while Fe incorporation improves the electronic structure, indeed accelerating intrinsic activity. The optimized Fe1Ni9NH shows high electrocatalytic activity with a low overpotential of 209 mV at 50 mA/cm2, a Tafel slope of 73 mV/dec and good long-term stability. Deep phase transformation from FeNi nitrate hydroxide to FeNi oxyhydroxide can be discovered with nitrate leaching during OER process. Our work provides a novel strategy for the design of efficient OER electrocatalyst and a new sight in the reconstruction process for FeNi based electrocatalysts. [Display omitted] •High disordered FeNiNH nanoplate arrays were synthesized for OER.•Reconstruction process was revealed by Raman spectroscopy.•A remarkable electrocatalytic activity with η50 at 209 mV is achieved.
ISSN:0925-8388
1873-4669
DOI:10.1016/j.jallcom.2022.167060