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Updated: Aug 15, 2025

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
Published on: June 9, 2023
Unveiling the role of defects in iron oxyhydroxide for oxygen evolution
Jingyi Han1, Xiaodi Niu2, Jingqi Guan1
1Institute of Physical Chemistry, College of Chemistry, Jilin University, 2519 Jiefang Road, Changchun 130021, China.
Abstract:
Development of earth-abundant and robust oxygen evolution reaction (OER) catalysts is imperative for cost-effective hydrogen production via water electrolysis. Herein, we report ultrafine iron (oxy)hydroxide nanoparticles with average particle size of 2.6 nm and abundant surface defects homogeneously supported on oleum-treated graphite (FeOx(n)@HG-T), providing abundant active sites for the OER. The optimal FeOx(0.03)@HG-110 exhibits high electrocatalytic OER activity and excellent stability. Electrochemical testing results and theoretical calculations reveal that the outstanding OER activity of FeOx(0.03)@HG-110 is due to its stronger charge transfer ability and lower OER energy barrier than defect-free FeOx nanoparticles. This work demonstrates that the OER performance of oxyhydroxide-based electrocatalysts can be improved by surface defect engineering.
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