Su Wei, Zhang Yan, Wang Huimin, Yang Min, Niu Zhiqiang
Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education), Renewable Energy Conversion and Storage Center, Haihe Laboratory of Sustainable Chemical Transformations, College of Chemistry, Nankai University, Tianjin, 300071, P. R. China.
Adv Mater. 2024 Jan;36(2):e2308042. doi: 10.1002/adma.202308042. Epub 2023 Nov 29.
Air self-charging power systems possess the capability of energy harvesting, conversion, and storage simultaneously. However, in general, their self-charging rate is slow and the batteries cannot be oxidized to the fully charged state due to the weak oxidizability of O . Herein, an ultrafast air self-charging aqueous zinc battery is designed by constructing a polyaniline@Pt/C (PANI@Pt/C) composite cathode. The introduction of Pt/C catalyst endows the redox reaction between PANI and O with fast reaction kinetics and extended redox potential difference. Therefore, the self-charging rate of the Zn/PANI@Pt/C batteries is effectively accelerated and they can be self-charged to fully charged state. Furthermore, the PANI can be recharged by O simultaneously during discharging process to compensate the consumed electrical energy, achieving prolonged energy supply. In addition, the PANI@Pt/C cathodes can be directly used as the cathodes of flexible self-charging zinc batteries due to their excellent mechanical properties. As a proof of concept, flexible soft-packaged Zn/PANI@Pt/C batteries are fabricated and displayed stable electrochemical performance and self-rechargeability even at different bending states. A route is provided here to design ultrafast chemical self-charging energy storage devices and the horizons of flexible energy storage devices are broadened.
空气自充电电源系统具备同时进行能量收集、转换和存储的能力。然而，一般来说，它们的自充电速率较慢，并且由于O的氧化能力较弱，电池无法被氧化至完全充电状态。在此，通过构建聚苯胺@铂/碳（PANI@Pt/C）复合阴极设计了一种超快空气自充电水系锌电池。铂/碳催化剂的引入赋予了聚苯胺与O之间的氧化还原反应快速的反应动力学和扩展的氧化还原电位差。因此，Zn/PANI@Pt/C电池的自充电速率得到有效加速，并且它们能够自充电至完全充电状态。此外，在放电过程中聚苯胺可同时被O再充电以补偿消耗的电能，实现延长的能量供应。另外，由于其优异的机械性能，PANI@Pt/C阴极可直接用作柔性自充电锌电池的阴极。作为概念验证，制备了柔性软包Zn/PANI@Pt/C电池，其即使在不同弯曲状态下也表现出稳定的电化学性能和自充电能力。本文提供了一种设计超快化学自充电储能装置的途径，并拓宽了柔性储能装置的视野。
