具有选择性激活芳香环的三维金属有机框架,用于高容量和高速率的离子存储
Sha Li1,2, Jiande Lin1,3, Huiqun Wang1
1College of Chemistry and Chemical Engineering, State Key Laboratory of Physical Chemistry of Solid Surfaces, Collaborative Innovation Centre of Chemistry for Energy Materials (iChEM), Xiamen University, Xiamen, Fujian, 361005, P. R. China.
Angewandte Chemie (International ed. in English)
|February 9, 2025
概括
本研究介绍了一种基于的金属有机框架 (MOF),用于离子电池. MOF证明了芳香环的选择性激活,以增强离子储存,实现高容量和耐用性.
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
- 纳米技术纳米技术
背景情况:
- 金属有机框架 (MOF) 由于其可调节的结构和多孔性,显示出作为离子电池 (LIB) 的阳极材料的潜力.
- 了解MOF结构和离子存储机制之间的关系对于优化电池性能至关重要.
- 在MOF中离子储存中,具有高LUMO能量水平的芳香环的作用是争论的一个关键领域.
研究的目的:
- 在各种化学环境中设计和合成一种基于的新型MOF (Co-NTTA) 具有芳香环.
- 在设计的MOF中调查离子储存机制和结构因素,这些因素决定了设计的MOF中的活跃场地利用情况.
- 为了评估Co-NTTA作为LIBs的阳极材料的电化学性能.
主要方法:
- 合成一种新的基于的MOF,Co-NTTA,利用NTTA连接体.
- 实验性特征包括电化学测试.
- 第一个原则计算,以阐明离子储存机制和电子结构.
主要成果:
- Co-NTTA MOF表现出一个可逆的电化学反应,每个公式单位涉及51个电子.
- 通过π-结合和π-π堆叠选择性激活内部芳香环,可以实现6电子伪电容的Li+间隙.
- 外部芳香环保持惰性,表明控制的离子储存.
- Co-NTTA在200 mA g-1下提供956 mAh g-1的高可逆容量,具有出色的高速度耐用性.
- 该材料支持4.3V离子混合电化学电容器,具有高能量和功率密度.
结论:
- 该研究成功地证明了MOF中芳香环的选择性激活,以增强离子储存.
- Co-NTTA作为LIB和混合电化学电容器的高性能阳极材料.
- 这项工作为先进的储能应用提供了对MOF结构设计的见解.
相关概念视频
01:23Properties of Organometallic Compounds
925
Organometallic compounds are compounds that contain a carbon–metal bond. Carbon belongs to an organyl group like alkyl, aryl, allyl, or benzyl groups. The metal can be from Group I or Group II of the periodic table, a transition metal, or a semimetal.
925
02:51Metal-Ligand Bonds
20.5K
The hemoglobin in the blood, the chlorophyll in green plants, vitamin B-12, and the catalyst used in the manufacture of polyethylene all contain coordination compounds. Ions of the metals, especially the transition metals, are likely to form complexes.
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
In these complexes, transition metals form coordinate covalent bonds, a kind of Lewis acid-base interaction in which both of the electrons in the bond are contributed by a donor (Lewis base) to an electron acceptor (Lewis acid). The Lewis acid in...
20.5K
01:18Aromatic Hydrocarbon Cations: Structural Overview
2.6K
Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group...
Removing one hydrogen from the intervening CH2 group...
2.6K