坚固的二维共价有机框架,用于高效的电化学离子储存
Yuzhao Guo1, Linqi Cheng2, Xupeng Zhang2
1State Key Laboratory of Supramolecular Structure and Materials, College of Chemistry, Jilin University, Changchun, 130012, China.
Angewandte Chemie (International ed. in English)
|July 9, 2025
概括
新的共价有机框架 (COF) 为离子电池提供了增强的稳定性和氧化还原活性. 作为阳极材料,TAPT-COF表现出卓越的性能,为先进的储能解决方案铺平了道路.
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:
- 共价有机框架 (COF) 对于先进材料至关重要,因为它们的可调结构和特性.
- 通过易于合成开发稳定和功能性的COF是扩大其应用的关键,特别是在能源储存中.
- 与伊米达相关的COF具有强大的结构和电化学活性的潜力.
研究的目的:
- 开发一种简单的合成策略,用于构建稳定的,与伊米达结合的共价有机框架 (COF).
- 研究这些新型COF作为离子电池 (SIB) 的阳极材料的潜力.
- 探索COF结构,氧化还原活性和SIB中的电化学性能之间的关系.
主要方法:
- 采用使用p-toluenesulfonic acid (PTSA) 作为质子介质的单循环凝结反应.
- 合成了两种与伊米达相关的COF:TABQ-COF和TAPT-COF,来自芳香性化物和正正二胺.
- 描述了COF的结晶性,物理化学稳定性和氧化还原活性位点.
主要成果:
- 成功合成了结晶和稳定的TABQ-COF和TAPT-COF,具有丰富的氧化还原活性位.
- 作为SIBs的阳极,TAPT-COF表现出了出色的电化学性能,在0.05 A g-1下提供了517 mAh g-1的可逆容量.
- TAPT-COF表现出卓越的循环稳定性,在1000个循环中,每个循环的容量降低<0.035%,在1.0 A g-1下.
结论:
- 通过使用PTSA介导的单反应,可以实现稳定,与伊米达相关的COFs的轻松合成.
- 在TAPT-COF中丰富的还氧活性中心 (CO和CN) 通过多电子还氧机制实现了高效的Na+储存.
- 具有工程化氧化还原基因的结构坚固的COF对高性能电化学能量存储有希望,特别是对于SIB.
更多相关视频
08:42Microfluidic-based Synthesis of Covalent Organic Frameworks COFs: A Tool for Continuous Production of COF Fibers and Direct Printing on a Surface
Published on: July 10, 2017
13.6K
10:03Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
Published on: November 11, 2013
25.6K
相关概念视频
02:42Ionic Crystal Structures
14.8K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
14.8K
02:48Ionic Bonding and Electron Transfer
42.4K
Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions.
42.4K
00:42Ionic Bonds
122.0K
Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
Ionic bonds are reversible electrostatic interactions between ions...
122.0K
03:45Formation of Complex Ions
24.0K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
24.0K