氧活性平面Ge(IV) O在共价有机框架中的链接器,用于增强的阳极Na+存储
Zhixin Liu1, Rong Jiang2, Shangwei Yuan3
1Beijing Advanced Innovation Center for Materials Genome Engineering, Beijing Key Laboratory for Science and Application of Functional Molecular and Crystalline Materials, Department of Chemistry and Chemical Engineering, School of Chemistry and Biological Engineering, University of Science and Technology Beijing, Beijing, 100083, P.R. China.
Angewandte Chemie (International ed. in English)
|October 8, 2025
概括
新的共价有机框架 (COF) 带有氧化还原活性链接剂显著提高了离子储存能力和导电性. 这些基于氨酸的COF证明了离子电池的出色性能.
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:
- 聚合有机框架 (COF) 经常使用不活跃的链接器,限制导电性 (<10−6 S cm−1) 并导致离子存储应用中的容量损失.
- 在COF中提高导电性和氧化还原活性对于提高离子储存性能至关重要.
研究的目的:
- 开发基于二维酸的新型COF (基于Pc的COF) 配有氧化还原活性链接剂,用于优质的离子存储.
- 研究这些新型COF中电子结构,导电性和电化学性能之间的关系.
主要方法:
- 制造2D GeO4-MPc-COFs (M = Co,Ni,Zn) 使用八氧化 (octahydroxylphthalocyaninato) 金属复合物和GeO2.
- 合成的COF电子结构和导电性的表征.
- 对离子 (Na+) 储存性能进行电化学测试,包括容量,速率能力和循环稳定性.
主要成果:
- 由于p-π相互作用和GeO4-MPc-COFs中的外定位的π电子,实现了显著增强的导电性 (0.140.36 × 10−2 S cm−1).
- 证明了出色的阳极Na+储存,具有607mAhg-1的高可逆特异容量,在100mAg-1.1下可逆性高.
- 在4000个循环中,在5 A g-1.1时,表现出极好的循环稳定性,容量衰减最小 (每循环0.00057%),超过4000个循环.
结论:
- 开发的GeO4-MPc-COFs,具有氧化还原活性Ge(IV) O4链接器和富含N的Pc单元,提供了卓越的离子储存能力.
- 增强的导电性和氧化还原活性是推动优越电化学性能的关键因素.
- 这些发现代表了COF设计在高性能储能应用中的重大进步.
更多相关视频
04:51Author Spotlight: Functionalizing Metal-Organic Frameworks: Advancements, Challenges, and the Power of Post-Synthetic Ligand Exchange
Published on: June 23, 2023
4.1K
09:49A Protocol for Electrochemical Evaluations and State of Charge Diagnostics of a Symmetric Organic Redox Flow Battery
Published on: February 13, 2017
10.9K
相关概念视频
02:51Metal-Ligand Bonds
24.0K
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...
24.0K
02:42Valence Bond Theory
11.2K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.2K
01:23Redox Equilibria: Overview
1.5K
A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
1.5K
02:34Structural Isomerism
21.5K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
21.5K
01:24Redox Reactions
58.2K
Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
58.2K
01:27Redox Reactions
897
Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
897