以离子交换为媒介的3D交联ZIF-L超结构,用于灵活的电化学能量存储
Hongye Ding1, Zheng Liu1, Ju Xie1
1School of Chemistry and Chemical Engineering, Yangzhou University, Yangzhou, Jiangsu, 225009, P. R. China.
Angewandte Chemie (International ed. in English)
|June 17, 2024
概括
我们开发了一种类似海的金属有机框架 (MOF) 超结构,用于增强能量存储. 这种新材料CoNi-ZIF-L表现出更好的导电性和稳定性,为先进的超级电容器铺平了道路.
科学领域:
- 材料科学 材料科学 材料科学
- 电化学 电化学 电化学
- 纳米技术纳米技术
背景情况:
- 金属有机框架 (MOF) 为储能提供了有前途的性能,包括高容量和可调节结构.
- 然而,由于电导率差和结构不稳定性,它们的实际应用受到限制.
- 现有的MOF经常在有效的离子和电子运输方面扎,影响性能.
研究的目的:
- 为能源存储应用设计一种具有增强导电性和稳定性的新型MOF超结构.
- 研究一种类似海的Co-ZIF-L超结构的自我组装和离子交换合成.
- 通过结合 (Ni) 来优化Co-ZIF-L,以创建CoNi-ZIF-L并评估其电化学性能.
主要方法:
- 通过分子模板和自组装制造类似海的Co-ZIF-L超结构.
- 合成后的离子交换以蚀刻和重建超结构成为3D交联的超薄多孔纳米板.
- 调整CoNi-ZIF-L中的Co与Ni比率,以创建微电场,以改善充电传输.
- 对CoNi-ZIF-L作为超级电容器中的电极材料进行电化学测试.
主要成果:
- 合成的CoNi-ZIF-L表现出更好的导电性,连续通道和高结构稳定性.
- Co6.53Ni-ZIF-L电极在1A/g时达到602F/g的高特异容量.
- 观察到卓越的循环稳定性,在4,000个循环以5A/g的电极后95.3%的保留率.
- 使用Co6.53Ni-ZIF-L//AC的非对称柔性超级电容器在5A/g的4,000个循环后显示出93.3%的容量保留.
结论:
- 开发的CoNi-ZIF-L超结构有效地解决了传统MOF的导电性和稳定性限制.
- 对成分和结构的精确控制导致了电子和离子转移的协同增强.
- 这项工作为设计基于MOF的高性能电极材料用于先进的能量存储设备提供了可行的策略.
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