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An Iron-Decorated Carbon Aerogel for Rechargeable Flow and Flexible Zn-Air Batteries.
Advanced Materials ( IF 29.4 ) Pub Date : 2020-07-01 , DOI: 10.1002/adma.202002292
Kunze Wu 1 , Lei Zhang 1 , Yifei Yuan 2 , Linxin Zhong 1 , Zhongxin Chen 3 , Xiao Chi 1, 3 , Hao Lu 1 , Zehong Chen 1 , Ren Zou 1 , Tingzhen Li 1 , Chengyu Jiang 1 , Yongkang Chen 1 , Xinwen Peng 1 , Jun Lu 2
Affiliation  

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/Fe2O3 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+RuO2 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.

中文翻译:

铁装饰的碳气凝胶,用于可充电流量和柔性Zn-空气电池。

具有出色的氧还原反应(ORR)和氧释放反应(OER)活性的机械稳定且可折叠的空气阴极是可穿戴金属空气电池的关键组件。本文报道了一种定向冷冻浇铸和退火方法,用于构建3D蜂窝状纳米结构,N,P掺杂的碳气凝胶,该气凝胶结合了原位生长的FeP / Fe 2 O 3纳米颗粒作为柔性Zn-空气电池的阴极( ZAB)。装有这种碳气凝胶的水性可再充电Zn-空气电池在20 mA cm -2的电流密度下具有648 mAh g -1的比容量,并具有良好的长期耐用性,其性能优于商业Pt / C + RuO 2催化剂。此外,这种具有方向性通道的可折叠碳气凝胶可以用作柔性固态Zn-空气电池的独立式空气阴极,而无需使用碳纸/布和添加剂,从而可提供676 mAh g -1的比容量和能量5 mA cm -2时密度为517 Wh kg -1,循环稳定性好。这项工作为设计和合成用于电化学能源设备的高效双功能空气阴极提供了新的策略。
更新日期:2020-08-11
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