了解电解质离子尺寸对导电金属有机框架超级电容器性能的影响
Jamie W Gittins1, Kangkang Ge2, Chloe J Balhatchet1
1Yusuf Hamied Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB2 1EW, U.K.
Journal of the American Chemical Society
|May 8, 2024
概括
电解质离子大小显著影响层状金属有机框架 (MOF) 超级电容器. 较小的离子会提高性能,而较大的离子会导致不对称的充电,并涉及能量储存中的溶剂.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 分层金属有机框架 (MOF) 显示了先进超级电容器的潜力.
- 了解电解质离子效应是优化基于MOF的能量存储设备的关键.
研究的目的:
- 研究四基酸 (TAABF4) 电解质中变化的四基 (TAA+) 阴离子如何影响Cu3的电化学性能.
- 在超级电容器运行过程中,在层层的MOF中阐明离子电吸机制.
主要方法:
- 使用Cu3 ((HHTP) 2电极进行了三电极电化学实验.
- 使用电化学石英晶体微平衡 (EQCM) 测量来研究离子电吸收.
- 使用了一系列具有系统变化的TAA+离子大小的1M TAABF4电解质.
主要成果:
- Cu3 ((HHTP) 2表现出不对称的充电,在正充电期间增强储存,并增加了较大的TAA+离子的不对称性.
- 较小的TAA+电离子为正负充电阶段带来了更高的电容性能.
- EQCM数据显示了阴离子主导的充电机制,对于较大的阴离子,观察到溶剂参与.
结论:
- 较大的TAA+离子可以和Cu3 ((HHTP) 2电极的孔隙,导致电荷更不对称,并在电荷存储过程中涉及溶剂.
- 这些发现为层层MOF的离子电吸收提供了关键的见解.
- 该研究提供了通过控制电解质离子大小来设计增强的MOF超级电容器的指导.
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