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Valence-Engineering of CeO2 Redox Modulator Boosts the Oxygen Electrocatalysis Performance in Fe/Co Dual-Atom
Hengqi Liu1, Jinzhen Huang2,3, Shengyu Ma1
1School of Physics, Harbin Institute of Technology, Harbin, 150001, China.
Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
|December 20, 2025
Summary
Dual-atom nitrogen-doped carbon catalysts show promise for rechargeable zinc-air batteries. Valence engineering of CeO2 improves catalyst durability and activity, enabling long-term stable operation.
Area of Science:
- Materials Science
- Electrochemistry
- Catalysis
Background:
- Dual-atom nitrogen-doped carbon catalysts are promising for rechargeable zinc-air batteries (ZABs) due to their bifunctional oxygen electrocatalytic activity.
- Durability issues during the oxygen reduction reaction (ORR) and limited oxygen evolution reaction (OER) activity hinder practical implementation.
Purpose of the Study:
- To resolve stability and activity issues in Fe/Co dual-atom catalysts (FeCo-N-C) for ZAB air electrodes.
- To enhance the performance of FeCo-N-C catalysts through valence engineering of a CeO2 redox modulator.
Main Methods:
- Valence engineering of CeO2 to create a redox modulator.
- Compositing FeCo-N-C with the engineered CeO2.
- Electrochemical characterization of the FeCo-N-C/CeO2 composite as an air electrode in ZABs.
Main Results:
- Engineered CeO2 with a fast Ce4+/Ce3+ redox process effectively scavenged oxidative by-products during ORR, enhancing durability.
- CeO2 interaction accelerated electron transfer and lowered Co redox potential during OER.
- ZABs with optimized FeCo-N-C/CeO2 achieved a maximum power density of 335 mWcm-2 and maintained stability for ~1000 hours.
Conclusions:
- Compositing FeCo-N-C with valence-engineered CeO2 offers a simple and effective strategy to overcome stability and activity limitations.
- This approach significantly improves the performance of air electrodes for rechargeable zinc-air batteries.
Keywords:
dual‐atom catalystsoxygen evolution reactionoxygen reduction reactionrechargeable zinc‐air batteriesvalence engineeringMore Related Videos
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