过电位
材料科学
剥脱关节
阴极
催化作用
共价键
石墨烯
化学工程
储能
电化学
纳米片
共价有机骨架
纳米技术
化学
多孔性
有机化学
复合材料
电极
物理化学
工程类
功率(物理)
物理
量子力学
作者
Cheng Jiang,Yu Zhang,Mi Zhang,Nana Ma,Guang‐Kuo Gao,Jianhui Wang,Mengmeng Zhang,Yifa Chen,Shun-Li Li,Ya‐Qian Lan
标识
DOI:10.1016/j.xcrp.2021.100392
摘要
Rechargeable Li-CO2 batteries have been studied extensively as an attractive strategy for simultaneous energy storage and CO2 fixation to address the global environmental and energy crisis. However, state-of-the-art Li-CO2 systems still suffer from unsatisfactory performance. Here, we successfully exfoliated quinone-based covalent organic frameworks (COFs) into large-scale and ultrathin MnO2/2,6-diaminoanthraquinone-2,4,6-triformylphloroglucinol (DQTP)-COF-nanosheet (NS) hybrid materials. The obtained ultrathin nanosheets (as thin as 1.87 nm) synergistically integrate quinone-COF-NSs with MnO2 and serve as powerful cathode catalysts in Li-CO2 batteries. MnO2/DQTP-COF-NS-3 has a high discharge capacity of 42,802 mAh/g at 200 mA/g. Additionally, it is durable for higher-stress test with a negligible change of overpotential from 500 to 1,000 mA/g and is discharged/charged rapidly for 120 cycles at 1 A/g. Moreover, the CO2 activation mechanism is discussed and supported by density functional theory (DFT) calculations. This work may pave a new way for exploring porous crystalline materials as efficient cathode catalysts for Li-CO2 batteries.
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