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Hybrid Nano-Atomic IrFe–N–C for Low-Iridium Oxygen Electrocatalysis
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OA
AI
M
H
S
李
X
Y
W
王
T
X
郭
陈
DOI：10.1002/smsc.70358.png)
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Abstract
En 中文
Designing efficient bifunctional catalysts for oxygen evolution and oxygen reduction reactions (OER/ORR) is essential for advancing metal–air batteries, yet remains challenging due to the fundamentally distinct reaction pathways involved. Here, we address this challenge by developing a hybrid IrFe–N–C electrocatalyst that integrates IrFe nanoparticles with a Fe–N–C support rich in atomically dispersed Fe–N4 sites. This hierarchical active-site design enables functional complementarity: IrFe nanoparticles preferentially catalyze the OER, while Fe–N4 moieties serve as highly active ORR sites. Effective metal–support interactions stabilize both single atoms and ultrafine nanoparticles, ensuring high activity and stability. As a result, the catalyst exhibits impressive bifunctional performance with reduced Ir loading, achieving an OER overpotential of only 227 mV at 10 mA cm−2. The mass activities for both OER and ORR far surpass those of state-of-the-art Ir/C and Pt/C benchmarks. When implemented in Zn–air batteries, the catalyst delivers promising power density and fair cycling stability. These results establish a rational design strategy for cost-effective, durable bifunctional catalysts toward next-generation energy storage technologies.
Keywords:
bifunctional oxygen electrocatalysis
Fe–N4
hierarchical active-site catalyst
metal-N–C
nanoparticles
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