Journal
ADVANCED FUNCTIONAL MATERIALS
Volume 32, Issue 52, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adfm.202209273
Keywords
bifunctional oxygen electrocatalysts; binder-free electrodes; rechargeable Zn-air batteries; single-atom catalysts
Categories
Funding
- Australian Research Council Discovery Project [DP210103266]
- AINSE Ltd.
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This study reports an efficient atomic modulation and structure design strategy to promote bifunctional activity and mass transport kinetics of an ORR/OER electrocatalyst. The prepared catalyst, Fe-N@Ni-HCFs, shows enhanced performance with remarkable power density and cycling stability for Zn-air batteries, surpassing the commercial benchmarks. This research provides a new approach for the design and fabrication of electrocatalysts for energy conversion and storage.
Excellent bifunctional oxygen reduction reaction (ORR)/oxygen evolution reaction (OER) activity and rapid mass transport capability are two important parameters of electrocatalysts for high-performance rechargeable Zn-air batteries (ZABs). Herein, an efficient atomic modulation and structure design to promote bifunctional activity and mass transport kinetics of an ORR/OER electrocatalyst are reported. Specifically, atomic Fe-N-4 moieties are immobilized on premade hollow carbon fibers with encapsulated Ni nanoparticles (Fe-N@Ni-HCFs). Synchrotron X-ray absorption spectroscopy and spherical aberration-corrected electron microscope analyses confirm the atomic distribution of the active sites and unique lung bubble-like hollow architecture of the catalyst, while theoretical investigations reveal that the encapsulated Ni nanoparticles can induce electron distribution of the atomic Fe-N-4 moieties to reduce reaction energy barriers. As a result, the prepared catalyst possesses enhanced bifunctional ORR/OER activity and well-constructed gas-solid-liquid interfaces for improved mass transfer. These synergetic advantages endow the binder-free Fe-N@Ni-HCFs electrode with the remarkable power density and cycling stability for ZABs, outperforming the commercial Pt/C+Ir/C benchmark. This exceptional performance suggests that the proposed strategy can be extended to the design and fabrication of electrocatalysts for energy conversion and storage.
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