阻止二维金属有机框架的溶解使电化学设备的寿命长
Gopi M R Dontireddy1, Satya Prakash Suman1, Jose L Merino-Gardea1
1Department of Chemistry and Biochemistry, The University of Texas at El Paso El Paso Texas 79968 USA hbanda1@utep.edu.
Chemical science
|July 12, 2024
概括
二维cMOF的溶解是电化学能量储存中降解的主要原因. 优化连接物溶解度和循环条件可以提高这些有前途的材料的稳定性.
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
- 储能 储能 储能 储能 储能 储能
背景情况:
- 二维联金属有机框架 (2D cMOF) 显示了电化学能量存储 (EES) 的潜力.
- 了解二维cMOF的电化学稳定性和降解机制对于其实际应用至关重要.
- 目前关于在循环过程中影响二维cMOF降解的因素的知识有限.
研究的目的:
- 研究三种基于铜的MOF (Cu-MOF) 的电化学稳定性.
- 在电化学循环过程中确定影响二维cMOF的主要降解途径.
- 阐明连接物溶解度和循环参数对MOF稳定性的影响.
主要方法:
- 在充放电循环下对三种基于的MOF进行电化学测试.
- 对降解机制的分析,重点是材料溶解.
- 连接物溶解度和循环持续时间与容量降解的相关性.
主要成果:
- 材料溶解为电解质被确定为2DcMOF的显著降解途径.
- 电解质溶剂中的联体溶解度和充放电周期持续时间强烈影响溶解.
- 由于某些Cu-MOF配置的溶解,产能降低了高达80%.
- 一个含有稀溶性联体的Cu-MOF在优化条件下表现出极好的循环稳定性.
结论:
- 2D cMOFs的电化学稳定性严重依赖于防止材料溶解.
- 连接体设计 (最小化溶解度) 和优化的循环协议是提高二维cMOF耐用性的关键.
- 这些发现为开发可靠的EES应用的2D cMOF提供了必要的指导方针.
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