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Surmounting the electronic paradox: A "push-pull" mediated Ru-Co3O4/FeOOH architecture for overall water splitting
Qingjie Luan1, Liyan Wang2, Ting Wu1
1School of Resource & Environment and Safety Engineering, Jining University, Qufu, Shandong 273155, PR China.
Journal of Colloid and Interface Science
|July 30, 2026
Summary
This study introduces a novel ruthenium-doped cobalt oxide/iron oxyhydroxide catalyst for overall water splitting (OWS). The unique electronic coupling enhances both hydrogen evolution reaction (HER) and oxygen evolution reaction (OER) kinetics, achieving high efficiency and durability.
Area of Science:
- Electrochemistry and Materials Science
- Catalysis for Sustainable Energy
Background:
- Overall water splitting (OWS) faces challenges due to conflicting electronic structure needs for hydrogen evolution reaction (HER) and oxygen evolution reaction (OER).
- Existing catalysts often exhibit compromised kinetic efficiency by failing to reconcile these competing demands within a single system.
Purpose of the Study:
- To overcome the limitations of conventional OWS catalysts by designing a system with optimized electronic structures for both HER and OER.
- To develop a synergistic 'push-pull' electronic coupling mechanism for enhanced bifunctional electrocatalyst performance.
Main Methods:
- Fabrication of an electronically coupled ruthenium-doped cobalt oxide/iron oxyhydroxide (Ru-Co3O4/FeOOH) architecture.
- Utilizing cobalt oxide (Co3O4) as an electronic mediator for electron transfer between iron oxyhydroxide (FeOOH) and ruthenium (Ru) single atoms.
- Investigating the electronic redistribution and its effect on HER and OER kinetics under cathodic and anodic polarization.
Main Results:
- The Ru-Co3O4/FeOOH system demonstrated a synergistic 'push-pull' mechanism, creating optimized electronic environments for HER and OER.
- Ruthenium sites acted as primary HER centers, enhanced by electron injection from FeOOH, accelerating kinetics.
- Interfacial cobalt sites served as dominant OER centers, with Ru and FeOOH optimizing charge distribution for efficient oxygen evolution.
Conclusions:
- The developed Ru-Co3O4/FeOOH electrocatalyst requires only 1.56 V to achieve 20 mA·cm−2 for OWS with excellent long-term durability.
- Mediated electronic coupling is a broadly applicable strategy for engineering bifunctional electrocatalysts with programmable electronic structures for efficient water splitting.
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