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Updated: Jan 7, 2026

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
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.
Abstract:
Dual-atom nitrogen-doped carbon catalysts have garnered considerable interest as air electrodes for rechargeable zinc-air batteries (ZABs), owing to their outstanding bifunctional oxygen electrocatalytic activity. Nonetheless, their practical implementation is hindered by durability issues during the oxygen reduction reaction (ORR), as the active sites are degraded by the oxidative by-products. Furthermore, the sluggish electron transfer obstructs the oxidation state transitions of Co/Fe centers to limit the oxygen evolution reaction (OER) activity. Here, the valence engineering is performed in CeO2 redox modulator that is composed with Fe/Co dual-atom catalyst (FeCo─N─C), to resolve the stability and activity issues. The valence-engineered CeO2 with a fast Ce4+/Ce3+ redox process can efficiently scavenge the highly oxidative by-products in ORR to improve the durability. In addition, the interaction of CeO2 with FeCo─N─C can accelerate electron transfer and lower the Co redox potential during the OER. The ZABs assembled with optimized FeCo─N─C/CeO2 as the air electrode display a maximum power density of 335 mWcm-2 without significant deterioration after ≈1000 h of continuous cycling. Therefore, compositing with valence-engineered CeO2 provides a simple and effective solution to resolve the stability and activity issues of FeCo─N─C as an air electrode.
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