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Updated: Feb 13, 2026
06:44
Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
Published on: June 9, 2023
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Fe-Substituted MoOx Catalysts With Lattice Distortion-Vacancy Coupling for Enhanced Alkaline Oxygen Evolution
Minhui Kim1, Byounguk Yu1, Hye Young Koo2
1Energy and Environment Materials Research Division, Korea Institute of Materials Science (KIMS), Changwon, Republic of Korea.
Chemsuschem
|February 12, 2026
Summary
Iron substitution in molybdenum oxide catalysts enhances their performance for water electrocatalysis. This novel approach improves electrical conductivity and creates a yolk-shell structure, boosting oxygen evolution reaction (OER) activity and stability.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Molybdenum oxide (MoOx) catalysts are cost-effective for water electrocatalysis but suffer from low conductivity and inactive oxidation states.
- Limited oxygen evolution reaction (OER) activity necessitates strategies to enhance MoOx catalyst performance.
Purpose of the Study:
- To develop Fe-substituted MoOx catalysts with controlled lattice distortion and oxygen vacancies.
- To improve the electronic structure and electrical conductivity of MoOx for enhanced OER activity.
- To elucidate the mechanism behind the improved catalytic performance.
Main Methods:
- Synthesis of Fe-substituted MoOx via aerosol spray pyrolysis and postannealing.
- Characterization of catalyst structure, including yolk-shell formation and Fe segregation.
- In situ electrochemical analyses to study reaction mechanisms and charge distribution.
Main Results:
- Fe substitution induced a yolk-shell structure with exposed active sites and improved Mo orbital hybridization.
- The optimized FeMoOx catalyst achieved 100 mA cm⁻² at a low overpotential of 294 mV with >100 h stability.
- Lattice oxygen species were activated via enhanced oxygen intermediate adsorption and O-O bond formation.
Conclusions:
- Fe-substituted MoOx catalysts offer a promising strategy for cost-effective, high-performance OER electrocatalysts.
- Controlled lattice distortion and oxygen vacancies are key to activating the lattice oxygen mechanism.
- This work provides mechanistic insights for designing advanced transition-metal-modified molybdenum oxide catalysts.
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