Journal
NANO ENERGY
Volume 79, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.nanoen.2020.105409
Keywords
Oxygen vacancy; 2D cobalt (II) oxide; X-ray absorption spectroscopy (XAS); ORR/OER; Rechargeable zinc-air flow battery
Categories
Funding
- Natural Sciences and Engineering Research Council of Canada (NSERC), Canada
- Canada Foundation for Innovation (CFI), Canada
- Centre Quebeco is sur les Materiaux Fonctionnels (CQMF), Canada
- Fonds de Recherche du Quebec-Nature et Technologies, Canada
- Institut National de la Recherche Scientifique (INRS), Canada
- 111 project [D18023]
- China Scholarship Council (CSC)
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The development of highly efficient bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is crucial for rechargeable Zn-air batteries. Cobalt (II) oxide (L-CoO) nanosheets with hierarchical nanostructures were grown on stainless steel (SS) substrate via a simple heat treatment, showing superior ORR/OER activity and stability in the rechargeable Zn-air flow battery for over 1000 hours. X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectroscopy (XPS) were used to uncover the reasons behind the excellent bifunctional catalytic performance of this catalyst, with operando XAS revealing the atomic-scale structures as support for the stability of L-CoO during electrocatalytic operation.
The development of highly efficient bifunctional catalysts for oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) is of paramount importance for rechargeable Zn-air batteries. Herein, cobalt (II) oxide (L-CoO) nanosheets with hierarchical nanostructures were grown on the stainless steel (SS) substrate via the facile heat treatment of 2D layered Co(OH)(2); and this binder-free 3D air electrode exhibits superior ORR/OER activity and stability (over 1000 h) in the rechargeable Zn-air flow battery. Importantly, X-ray absorption spectroscopy (XAS) and X-ray photoelectron spectroscopy (XPS) were employed to reveal the origins of the excellent bifunctional catalytic performance of this catalyst. Moreover, the evolution of the atomic-scale structures revealed by operando XAS strongly supports the excellent stability of L-CoO during electrocatalytic operation. Our work suggests a facile strategy to construct oxygen vacancy active sites; meanwhile, it offers a deep understanding at the atomic level on the excellent cycling stability in the Zn-air flow battery through X-ray spectroscopy.
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