Journal
ADVANCED MATERIALS
Volume 32, Issue 32, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.202002292
Keywords
3D honeycomb nanostructures; bifunctional electrocatalysts; carbon aerogels; metal-air batteries; Zn-air batteries
Categories
Funding
- National Natural Science Foundation of China [31971614, 21736003]
- Guangdong Natural Science Funds for Distinguished Young Scholar [2016A030306027]
- Guangdong Natural Science Funds [2017A030313130]
- Guangzhou Science and Technology Funds [201904010078]
- State Key Laboratory of Pulp and Paper Engineering [2018PY13]
- U.S. Department of Energy (DOE), Office of Energy Efficiency and Renewable Energy, Vehicle Technologies Office
- DOE Office of Science [DE-AC02-06CH11357]
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Mechanically stable and foldable air cathodes with exceptional oxygen reduction reaction (ORR) and oxygen evolution reaction (OER) activities are key components of wearable metal-air batteries. Herein, a directional freeze-casting and annealing approach is reported for the construction of a 3D honeycomb nanostructured, N,P-doped carbon aerogel incorporating in situ grown FeP/Fe(2)O(3)nanoparticles as the cathode in a flexible Zn-air battery (ZAB). The aqueous rechargeable Zn-air batteries assembled with this carbon aerogel exhibit a remarkable specific capacity of 648 mAh g(-1)at a current density of 20 mA cm(-2)with a good long-term durability, outperforming those assembled with commercial Pt/C+RuO(2)catalyst. Furthermore, such a foldable carbon aerogel with directional channels can serve as a freestanding air cathode for flexible solid-state Zn-air batteries without the use of carbon paper/cloth and additives, giving a specific capacity of 676 mAh g(-1)and an energy density of 517 Wh kg(-1)at 5 mA cm(-2)together with good cycling stability. This work offers a new strategy to design and synthesize highly effective bifunctional air cathodes to be applied in electrochemical energy devices.
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