过渡金属氧化中心与化物联体之间的相互作用对普鲁士白色阴极中的结构演变的影响
Ju-Hyeon Lee1,2, Jin-Gyu Bae1,2, Min Sung Kim1,2
1School of Materials Science and Engineering, Kyungpook National University, Daegu 41566, Republic of Korea.
ACS nano
|January 12, 2024
概括
在可充电电池中使用的普鲁士白色显示了受电子相互作用影响的相位过渡. 控制这些相互作用通过在充电和放电期间管理晶格体积来优化阴极性能.
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
- 固态化学 固态化学
背景情况:
- 过渡金属 (TM) 普鲁士白色是充电电池的关键阴极材料.
- 它们的性能与TM电子状态 (低旋转/LS和高旋转/HS) 和2+的平均TM氧化状态有关.
- 在离子储存期间的相位过渡行为至关重要,但尚未完全理解.
研究的目的:
- 调查普鲁士白色的相变行为,使用不同的高旋转 (HS) TM离子.
- 探索化离子和TM离子之间的π电子相互作用在控制电池性能方面的作用.
- 为普鲁士白色阴极建立一个全面的结构-财产关系.
主要方法:
- 通过共沉合成与不同HSTM离子的普鲁士白.
- 在现场进行X射线表征,以监测电池运行期间的结构变化.
- 在TM─CN─TM框架内对π电子相互作用 (π回捐和π捐) 的分析.
主要成果:
- π回捐 (LS Fe-C) 和π捐 (HS TM-N) 的相互作用决定了TM─CN─TM债券的长度.
- 这些电子相互作用有效地控制了充/放电周期期间的格子体积变化.
- 不同的HSTM离子导致不同的相位过渡行为.
结论:
- π电子相互作用对于确定普鲁士白色阴极的电化学性能至关重要.
- 了解这些相互作用,可以合理设计先进的电池材料.
- 这项工作为用于储能应用的普鲁士白的结构-属性相关性提供了更深入的见解.
更多相关视频
07:55Elemental-sensitive Detection of the Chemistry in Batteries through Soft X-ray Absorption Spectroscopy and Resonant Inelastic X-ray Scattering
Published on: April 17, 2018
12.7K
05:47Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
Published on: August 7, 2018
7.7K
相关概念视频
02:58Properties of Transition Metals
25.9K
Transition metals are defined as those elements that have partially filled d orbitals. As shown in Figure 1, the d-block elements in groups 3–12 are transition elements. The f-block elements, also called inner transition metals (the lanthanides and actinides), also meet this criterion because the d orbital is partially occupied before the f orbitals.
25.9K
03:45Formation of Complex Ions
23.6K
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...
23.6K
02:58Crystal Field Theory - Octahedral Complexes
26.5K
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...
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...
26.5K
03:02Colors and Magnetism
11.7K
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...
11.7K
01:30Ladder Diagrams: Redox Equilibria
458
Ladder diagrams are useful tools for understanding redox equilibrium reactions, especially the effects of concentration changes on the electrochemical potential of the reaction. The vertical axis in the redox ladder diagrams represents the electrochemical potential, E. The area of predominance is demarcated using the Nernst equation.
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
Consider the Fe3+/Fe2+ half-reaction, which has a standard-state potential of +0.771 V. At potentials more positive than +0.771 V, Fe3+ predominates, whereas Fe2+...
458
02:42Valence Bond Theory
8.6K
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...
8.6K