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相关概念视频

Metal-Ligand Bonds02:51

Metal-Ligand Bonds

21.0K
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...
21.0K
Valence Bond Theory02:42

Valence Bond Theory

8.7K
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...
8.7K
Complexation Equilibria: The Chelate Effect01:19

Complexation Equilibria: The Chelate Effect

551
In complexation reactions, metal atoms or cations interact with ligands to form donor-acceptor adducts called metal complexes. Ligands that bind through one donor site are monodentate, ligands with two donor sites are bidentate, and those with more than two donor sites are polydentate ligands. For example, ethylene diamine is a bidentate ligand that binds through two nitrogen donor atoms, forming a five-membered ring. EDTA is a polydentate ligand that binds through four oxygen and two nitrogen...
551
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

26.7K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
26.7K
Colors and Magnetism03:02

Colors and Magnetism

11.9K
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...
11.9K
EDTA: Chemistry and Properties01:22

EDTA: Chemistry and Properties

2.0K
Polydentate ligands are most widely used in complexometric titrations because they form more stable complexes with the metal ions than mono- or bidentate ligands due to the chelate effect. Examples of polydentate ligands are ethylenediaminetetraacetic acid (EDTA), crown ethers, and cryptands. The most important feature of optimal polydentate ligands is the ability to form 1:1 complexes in a single-step process. Amino carboxylic acid derivatives are frequently used as complexing agents. EDTA is...
2.0K

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通过离子协调操纵稳定Mn富酸盐阴极的"Mn锁定"效应.

Wei Zhang1,2,3, Yulun Wu1, Yuhang Dai3

  • 1School of Metallurgy and Environment, Engineering Research Center of the Ministry of Education for Advanced Battery Materials, Hunan Provincial Key Laboratory of Nonferrous Value-Added Metallurgy, Central South University Changsha 410083 P. R. China zhangzhian@csu.edu.cn laiyanqing@csu.edu.cn.

Chemical science
|August 18, 2023
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概括
此摘要是机器生成的。

兴奋剂通过提高稳定性和动力学来增强丰富的酸盐阴极用于离子电池. 这一策略提高了电池的性能,使高功率和稳定的循环用于先进的能量存储.

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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
  • 储能 储能 储能 储能 储能 储能

背景情况:

  • 高压阴极对于高性能离子电池 (SIB) 是至关重要的.
  • 富含的酸盐正面临着由于低动力学和结构不稳定的挑战,限制了容量保留.
  • 开发稳定高效的阴极对于推进SIB技术至关重要.

研究的目的:

  • 为了研究轻量化 (F) 兴奋剂对SIBs富含Mn的酸盐阴极的影响.
  • 为了提高这些正极的电化学性能,特别是功率和循环性.
  • 了解F兴奋剂对阴极稳定性和运动学的影响背后的机制.

主要方法:

  • 密度函数理论 (DFT) 计算来分析电子结构和粘合.
  • 富含的酸盐材料的 (F) 化.
  • 现场和现场表征技术用于研究结构和化学变化.
  • 电化学测试以评估速度性能和循环稳定性.

主要成果:

  • 兴奋剂显著减少了能量差距,从1.52 eV降至0.22 eV.
  • 一个小小的东西.
  • 在Mn-锁定.
  • 观察到的效果是,加强Mn-连接体的结合,抑制Mn溶解.
  • 实现了更好的结构稳定性和更好的电子导电性.
  • 电化学测试表明,在高达40°C的温度下表现出色,在20°C的温度下稳定循环超过1000个循环.
  • 化剂并没有改变基本的Na+储存机制.

结论:

  • 轻量化兴奋剂是一种有效的策略,可以提高Mn丰富的酸盐阴极的性能.
  • 这是一个很棒的节目,这是一个很棒的节目.
  • 在Mn-锁定.
  • 由F兴奋剂引起的效应增强了结构完整性和电化学动力学.
  • 这种离子兴奋剂方法为开发用于离子电池的高性能聚离子阴极提供了可行的途径.