氧化还原
动力学
催化作用
电解质
电池(电)
公制(单位)
化学
无机化学
锰
流动电池
化学工程
材料科学
冶金
电极
热力学
生物化学
工程类
物理化学
物理
业务
功率(物理)
量子力学
营销
作者
Qi Wang,Wanhai Zhou,Yanyan Zhang,Hongrun Jin,Xinran Li,Tengsheng Zhang,Boya Wang,Ruizheng Zhao,Junwei Zhang,Wei Li,Yu Qiao,Chuankun Jia,Dongyuan Zhao,Dongliang Chao
摘要
ABSTRACT The virtues of electrolytic MnO2 aqueous batteries are high theoretical energy density, affordability and safety. However, the continuous dead MnO2 and unstable Mn2+/MnO2 electrolysis pose challenges to the practical output energy and lifespan. Herein, we demonstrate bifunctional cationic redox mediation and catalysis kinetics metrics to rescue dead MnO2 and construct a stable and fast electrolytic Zn–Mn redox-flow battery (eZMRFB). Spectroscopic characterizations and electrochemical evaluation reveal the superior mediation kinetics of a cationic Fe2+ redox mediator compared with the anionic ones (e.g. I– and Br–), thus eliminating dead MnO2 effectively. With intensified oxygen vacancies, density functional theory simulations of the reaction pathways further verify the concomitant Fe-catalysed Mn2+/MnO2 electrolysis kinetics via charge delocalization and activated O 2p electron states, boosting its rate capability. As a result, the elaborated eZMRFB achieves a coulombic efficiency of nearly 100%, ultra-high areal capacity of 80 mAh cm–2, rate capability of 20 C and a long lifespan of 2500 cycles. This work may advance high-energy aqueous batteries to next-generation scalable energy storage.
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