通过铁协调共价有机框架进行阴极设计,以促进四电子转移以实现高容量的水性电池
Songde Guo1, Sanlue Hu2, Senlin Li1,2
1Faculty of Materials Science and Energy Engineering, Shenzhen University of Advanced Technology, Shenzhen 518107, China.
ACS nano
|September 2, 2025
概括
研究人员为- (Zn-I2) 电池开发了一种新的铁协调共价有机框架 (PPBY-Fe-COF). 这种材料可实现高压I0/I+氧化还原化学,显著提高电池性能和能量密度.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- - (Zn-I2) 电池具有高能量密度的潜力,但由于依赖I-/I0氧化还原对而受到限制.
- 在阴极中激活高压I0/I+氧化还原化学对于提高Zn-I2电池性能至关重要.
- 目前在电池阴极中利用较高价值状态的策略很少.
研究的目的:
- 设计和合成一种用于激活Zn-I2电池中的I-I0/I+氧化还原化学的新型宿主材料.
- 在水性Zn-I2电池中研究设计材料的电化学性能和稳定性.
- 展示一种开发高能量密度水性Zn-I2电池系统的新方法.
主要方法:
- 合成一种与铁 (Fe) 协调的二二烯共价有机框架 (PPBY-Fe-COF).
- 电化学特征ZnRadI@PPBY-Fe-COF电池,包括循环电压测量和静电循环.
- 分析涉及Fe位点和CN群的氧化还原机制,以及OTF-在稳定中间体中的作用.
主要成果:
- PPBY-Fe-COF材料成功实现了连续的I-/I0/I+氧化还原化学.
- 该电池实现了240 mAh gI-1的特定容量.
- 该电池表现出很好的长期稳定性,在8000个循环后保持90.9%的容量.
结论:
- 开发的PPBY-Fe-COF材料有效地激活了水性Zn-I2电池中的高压I0/I+氧化还原对.
- PPBY-Fe-COF的独特结构促进了可逆的多电子转移,从而产生高能量密度.
- 这项工作为推进高性能水性Zn-I2电池技术提供了有前途的战略.
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