阐明基于V的还原介质的设计标准:结构-功能关系,决定异质电子转移速率
Mamta Dagar1, William W Brennessel1, Ellen M Matson1
1University of Rochester, Department of Chemistry, Rochester, NY 14627, USA.
Chemistry (Weinheim an der Bergstrasse, Germany)
|April 4, 2024
概括
这项研究比较了四种复合物作为能量转换的氧化还原媒介. 中心之间的电子通信显著影响了电子转移动力学,这对于高效的能源过程至关重要.
科学领域:
- 电化学 电化学 电化学
- 材料科学 材料科学 材料科学
- 无机化学 无机化学
背景情况:
- 氧化还原介质对于克服能量转换过程中的动力限制至关重要.
- 复合物为各种应用提供可调节的电化学特性.
- 了解氧化瓦纳的结构性质关系是优化其性能的关键.
研究的目的:
- 为了比较四种不同的复合物的电化学特性.
- 在相同的实验条件下研究电子转移动力学和扩散性.
- 阐明结构-功能关系,规范氧化瓦纳组件的物理化学性质.
主要方法:
- 在非水溶液中的四种复合物的电化学表征 ([V(acac) 3],[V6O7(OMe) 12],[nBu4N]3[V6O13(TRISNO2) 2],[nBu4N]5[V18O46(NO3)).
- 使用玻璃碳电极进行所有测量.
- 分析了基于核度和电子密度分布的电子转移动力学和扩散性.
主要成果:
- 在研究的复合物中,在电化学性质上表现出显著的差异.
- 确定金属中心之间的电子通信直接影响电荷转移动力学.
- 确定核度和电子密度分布作为影响氧化还原介质性能的关键因素.
结论:
- 电子通信是控制基于的氧化还原介质的电荷传递动力学的主导因素.
- 这些发现为设计高效的氧化瓦纳组件用于能源转换提供了洞察力.
- 这项研究有助于对过渡金属复合体中的结构性质相关性的基本理解.
相关概念视频
Redox Equilibria: Overview
564
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...
564
Ladder Diagrams: Redox Equilibria
457
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+...
457
Oxidation-Reduction Reactions
64.9K
Oxidation–Reduction Reactions
64.9K
Redox Titration: Other Oxidizing and Reducing Agents
283
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
283
Electron Transport Chain: Complex III and IV
7.4K
During the electron transport chain, electrons from NADH and FADH2 are first transferred to complexes I and II, respectively. These two complexes then transfer the electrons to ubiquinol, which carries them further to complex III. Complex III passes the electrons across the intermembrane space to Cyt c, which carries them further to complex IV. Complex IV donates electrons to oxygen and reduces it to water. As electrons pass through complexes I, III, and IV, the energy released aids the pumping...
7.4K
Oxidation of Phenols to Quinones
3.0K
In the presence of oxidizing agents, phenols are oxidized to quinones. Quinones can be easily reduced back to phenols using mild reducing agents. The electron-donating hydroxyl group enhances the reactivity of the aromatic ring, enabling oxidation of the ring even in the absence of an α hydrogen.
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
o-hydroxy phenols are oxidized to o-quinones and p-hydroxy phenols to p-quinones. Such redox reactions involve the transfer of two electrons and two protons. The reversible redox...
3.0K

![Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase](/_next/image?url=https%3A%2F%2Fcloudfront.jove.com%2FCDNSource%2Fteasers%2F55858.jpg&w=3840&q=50)
