对半基金属有机框架中的氧化解化学的协同效应
Michael E Ziebel1,2, Carlo Alberto Gaggioli3, Ari B Turkiewicz1
1Department of Chemistry , University of California , Berkeley , California 94720 , United States.
Journal of the American Chemical Society
|January 16, 2020
概括
两个新的铁基金属有机框架显示了电池的高电化学容量. 这些材料对离子,离子和离子储能应用具有前景.
科学领域:
- 材料科学
- 电化学
- 能量储存
背景情况:
- 金属有机框架 (MOF) 越来越多地被用于储能应用.
- 对于设计高性能MOF电极而言,了解金属和配体氧化还原活性之间的相互作用至关重要.
- 开发各种电池化学物质的高效阴极材料仍然是一个重大挑战.
研究的目的:
- 合成和描述用于电化学储能的新型铁半体框架材料.
- 通过详细的光谱和计算分析来阐明高电化学容量的起源.
- 评估这些MOF作为离子,离子和离子电池中的正极材料的性能.
主要方法:
- 两种铁半体框架材料的合成: (H2NMe2) 2Fe2 ((Cl2dhbq) 3 (1) 和 (H2NMe2) 4Fe3 ((Cl2dhbq) 3 ((SO4) 2 (2-SO4).
- 使用循环电压测量和静电循环的电化学表征.
- 光谱分析 (例如,莫斯巴尔光谱,X射线光电子光谱) 和电子结构计算.
- 离子,离子和离子电池设备的原型制造和测试.
主要成果:
- 框架1显示高电化学容量高达195mAh/g,归因于协同的金属和联体中心的氧化还原过程.
- 使用框架1作为阴极的离子装置原型实现了533Wh/kg的峰值特能,在50个周期内保持了合理的容量.
- 一种绝缘材料的框架2-SO4显示出快速的容量色,突出显示了MOF阴极中电子导电性的必要性.
- 框架1在离子电池和离子电池中的阴极具有相似的容量.
结论:
- 金属和配体轨道之间的能量对齐对于在MOF电极中实现高电容至关重要.
- 铁半形MOF,特别是像框架1这样的导电性MOF,是各种电池化学物质的有希望的阴极材料.
- 这些发现强调了MOF作为下一代储能多功能高性能材料的潜力.
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