氧化还原
阴极
水溶液
微型多孔材料
材料科学
共价键
电化学
锌
共价有机骨架
化学工程
无机化学
电极
有机化学
化学
物理化学
复合材料
冶金
工程类
作者
Zhitao Lin,Lin Lu,Jiaqi Zhu,Wanlong Wu,Xianpeng Yang,Xiaoqi Sun
标识
DOI:10.1021/acsami.2c08170
摘要
Covalent organic frameworks (COFs) are promising cathode candidates with high structural stability. However, they contain redox inactive linkages and experience low redox potential. Herein, a full anti-aromatic microporous COF cathode material of TAQ-BQ is designed for aqueous zinc batteries. The anti-aromatic conjugation effectively lowers the energy level of the lowest unoccupied molecular orbital as revealed by theoretical calculations, which corresponds to an elevated redox potential. Besides, the structure contains imino active sites at the linkages, in addition to carbonyl at the active parts. As a result, the TAQ-BQ cathode exhibits a voltage of 1.53 V/1.54 V and between 1.35 and 0.45 V in zinc cells. It delivers 208 mAh g–1 capacity at 0.1 A g–1 and maintains 136 mAh g–1 at 2 A g–1. Stable cycling is realized for 1000 cycles with 87% capacity retention. The co-de/insertion of Zn2+ and protons is identified for energy storage. Our work reveals the promises of COF cathode materials for aqueous zinc batteries.
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