南开大学牛志强团队研制了质子化学诱导长循环空气自充电水性电池。相关研究成果发表在2022年8月19日出版的《德国应用化学》。

空气自充电水性金属离子电池通常在自充电循环后，由于在近中性电解质中阴极上形成碱性盐而遭受容量损失。

该文中，在酸性电解质中开发了基于质子化学的空气自充电铅/芘-4, 5, 9, 10-四酮（PTO）电池。H⁺吸收/去除的快速动力学赋予电池增强的电化学性能。由于酸性电解液中氧的高标准电极电势，放电阴极在空气中的氧与H⁺萃取一起自发氧化，从而实现无需外部电源的自充电。值得注意的是，涉及H⁺基氧化还原的空气自充电机制可以有效避免自充电电极上碱性盐的生成，从而保证Pb/PTO电池的长期自充电/恒流放电循环。

该项工作为设计长周期空气自充系统提供了一种有前景的策略。

附：英文原文

Title: Proton Chemistry Induced Long-Cycle Air Self-Charging Aqueous Batteries

Author: Fang Yue, Zhiwei Tie, Yan Zhang, Songshan Bi, Yijing Wang, Zhiqiang Niu

Issue&Volume: 2022-08-19

Abstract: Air self-charging aqueous metal-ion batteries usually suffer from capacity loss after self-charging cycles due to the formation of  basic salts  on cathodes in the near-neutral electrolytes. Here, air self-charging Pb/pyrene-4, 5, 9, 10-tetraone (PTO) batteries based on proton chemistry are developed in acidic electrolyte. The fast kinetics of H  +  uptake/removal endows the battery with enhanced electrochemical performance. Owing to the high standard electrode potential of oxygen in acid electrolyte, the discharged cathodes are spontaneously oxidized by oxygen in air along with H  +  extraction and thus achieve self-charging without external power supply. Notably, the air self-charging mechanism involved H  +  -based redox can effectively avoid the generation of basic salts on self-charging electrodes and thus guarantee long-term self-charging/galvanostatic discharging cycles of Pb/PTO batteries. This work provides a promising strategy for designing long-cycle air self-charging systems.

DOI: 10.1002/anie.202208513

Source: https://onlinelibrary.wiley.com/doi/10.1002/anie.202208513