Elevated Water Oxidation by Cation Leaching Enabled Tunable Surface Reconstruction

Water electrolysis is one promising and eco-friendly technique for energy storage, yet its overall efficiency is hindered by the sluggish kinetics of oxygen evolution reaction (OER). In response, developing strategies to boost OER catalyst performance is crucial. With the advances in characterizatio...

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Published in:Angewandte Chemie International Edition 2024-07, Vol.63 (31), p.e202402184
Main Authors: Luo, Songzhu, Dai, Chencheng, Ye, Yike, Wu, Qian, Wang, Jiarui, Li, Xiaoning, Xi, Shibo, Xu, Zhichuan J
Format: Article
Language:English
Subjects:
Active control
Catalysts
Electrodes
Electrolysis
Energy storage
Iron compounds
Leaching
Nickel compounds
Oxidation
Oxygen evolution reactions
Reaction kinetics
Reconstruction
Structural analysis
Substitution reactions
Surface structure
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Summary:Water electrolysis is one promising and eco-friendly technique for energy storage, yet its overall efficiency is hindered by the sluggish kinetics of oxygen evolution reaction (OER). In response, developing strategies to boost OER catalyst performance is crucial. With the advances in characterization techniques, an extensive phenomenon of surface structure evolution into an active amorphous layer was uncovered. Surface reconstruction in a controlled fashion was then proposed as an emerging strategy to elevate water oxidation efficiency. In this work, Cr substitution induces the reconstruction of NiFexCr2-xO4 during cyclic voltammetry (CV) conditioning by Cr leaching, which leads to a superior OER performance. The best-performed NiFe0.25Cr1.75O4 shows a ~1500% current density promotion at overpotential η = 300 mV, which outperforms many advanced NiFe-based OER catalysts. It is also found that their OER activities are mainly determined by Ni:Fe ratio rather than Fe content in all metal elements. Meanwhile, the turnover frequency (TOF) values based on redox peak and total mass were obtained and analysed, and their possible limitations in the case of NiFexCr2-xO4 are discussed. Additionally, the high activity and durability were further verified in a membrane electrode assembly (MEA) cell, highlighting its potential for practical large-scale and sustainable hydrogen gas generation.
ISSN:1433-7851
1521-3773
1521-3773
DOI:10.1002/anie.202402184