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Updated: Jan 1, 2026

Tuning Oxide Properties by Oxygen Vacancy Control During Growth and Annealing
Published on: June 9, 2023
Boosted Oxygen Evolution Reactivity by Igniting Double Exchange Interaction in Spinel Oxides
Jiangtian Li1, Deryn Chu1, Hong Dong1
1U.S. Army Research Laboratory , 2800 Powder Mill Road , Adelphi , Maryland 20783 , United States.
Abstract:
A double-exchange interaction (DEI) was demonstrated to boost the oxygen evolution reaction (OER) in spinel oxides. DEI was ignited by synergistic actions of constructing nanoheterojunctions and creating oxygen vacancy (VO) in spinel NiCo2O4. DEI between octahedrally coordinated Ni and Co resulted in the generation of superior OER active centers Co(3-δ)+ and Ni3+. The multiple synergistic effects empower the electrocatalyst with exceptional OER activity, with an overpotential of 270 ± 3 mV at 10 mA/cm2 and a Tafel slope of 39 mV/dec, both of which are among the best values for NiCo2O4-based nanostructures, and even better than those for IrO2 and RuO2.
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