基于阳离子调制的二维协调聚合物和超级电容器中的应用
Zhao-Ting Shang1, Yu-Juan Xie1, Dandan Chen1
1College of Optoelectronic Materials and Technology, Key Laboratory of Flexible Optoelectronic Materials & Technology, Ministry of Education, Jianghan University, Wuhan, Hubei 430056, China.
Inorganic chemistry
|September 22, 2025
概括
研究人员使用伪化离子来控制超级电容的二维协调聚合物 (CP) 的形态. 这导致了统一的状结构,提高了电化学能量储存性能和稳定性.
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
- 纳米技术 纳米技术
背景情况:
- 超级电容器对于储能至关重要,因为它们的充/放电速度快,功率密度高,周期寿命长.
- 二维 (2D) 协调聚合物 (CPs) 对电化学储能应用有很大的前景.
- 控制二维CP的形态是至关重要的,但对于优化其性能具有挑战性.
研究的目的:
- 调查伪化离子 (SeCN-,SCN-) 作为晶体生长修饰剂的使用,以精确控制二维CP的形态.
- 通过实现统一的片状结构来增强二维CP的电化学能量储存能力.
- 探索在循环过程中产生的CO2的协同效应,以提高超级电容器的性能.
主要方法:
- 利用伪化物离子 (SeCN-,SCN-) 来指导二维协调聚合物的晶体生长.
- 合成和表征了统一的状Co-CP-Se结构.
- 制造并测试了一种混合超级电容器设备 (Co-CP-Se//AC) 用于电化学性能评估.
主要成果:
- 使用SeCN-便于形成均的状2D CP结构,因为其原子半径很大,极化性很高.
- Co-CP-Se在1 A g-1下实现了1483 F g-1的高特异电容和出色的循环稳定性 (93.23%在10 A g-1下5000个循环后保持).
- 混合超级电容器 (Co-CP-Se//AC) 在5000个循环后提供了750 W kg-1的功率密度,能量密度为42.14 Wh kg-1,容量保留率为90.12%.
结论:
- 通过使用伪化离子作为晶体生长修饰剂,可以实现对二维CP的精确形态控制.
- 统一的板状结构显著增强了电解质-电极接口接触,从而提高了超级电容器的性能.
- 与Co-CP-Se一起在现场生成的Co(OH) 2的协同贡献是增强电容的关键,为设计高性能2DCP用于储能提供了洞察力.
更多相关视频
08:59Synthesizing a Gel Polymer Electrolyte for Supercapacitors, Assembling a Supercapacitor Using a Coin Cell, and Measuring Gel Electrolyte Performance
Published on: November 30, 2022
5.1K
14:42Fabrication of Carbon-Based Ionic Electromechanically Active Soft Actuators
Published on: April 25, 2020
8.8K
相关概念视频
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
02:54Coordination Compounds and Nomenclature
26.3K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
26.3K
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
03:02Colors and Magnetism
14.0K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.0K
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
01:31Dielectric Polarization in a Capacitor
5.9K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
5.9K