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Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Electron Transport Chain: Complex III and IV01:43

Electron Transport Chain: Complex III and IV

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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...
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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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...
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Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

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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...
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Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

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Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
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Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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在多铜氧化酶阴极上模拟二氧化碳的减少.

Peter Agbo1, James R Heath, Harry B Gray

  • 1Beckman Institute, Noyes Laboratory of Chemical Physics, California Institute of Technology , Pasadena, California 91125, United States.

Journal of the American Chemical Society
|September 5, 2014
PubMed
概括
此摘要是机器生成的。

我们开发了多铜氧化酶 (MCO) 阴极的动力学模型,将电极和酶动力学结合起来. 该模型有助于设计高效的MCO阴极和估计活性位点属性.

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科学领域:

  • 电化学 电化学 电化学
  • 生物催化剂是一种生物催化剂.
  • 化学动力学 化学动力学

背景情况:

  • 多铜氧化酶 (MCOs) 是减少二氧化物的关键生物催化剂.
  • 了解MCO阴极中电子转移 (ET) 的动力学对于提高其效率至关重要.
  • 当前的模型往往简化了电极和酶动力学之间的复杂相互作用.

研究的目的:

  • 在MCO阴极上开发一种用于催化二氧化碳还原的一般动力学模型.
  • 将巴特勒-沃尔默 (BV) 电极动力学与迈凯利斯-门 (MM) 酶形式主义结合起来.
  • 为设计更高效的基于MCO的电化学系统提供框架.

主要方法:

  • 将Butler-Volmer (BV) 和Michaelis-Menten (MM) 动力学结合到一个统一的速率方程中.
  • 集成的界面电子转移 (ET) 和分子内ET过程.
  • 使用来自Thermus thermophilus laccase的实验电化学数据验证了该模型.

主要成果:

  • 开发了MCO阴极动力学的分析表达式,考虑了二氧化物结合.
  • 成功地将模型与实验数据进行了比较,证明了其预测能力.
  • 该模型提供了电子合和主动站点到基板距离的估计.

结论:

  • 拟议的通用动力学模型准确地描述了MCO阴极上的二氧化碳减少.
  • 该模型是优化MCO阴极设计和性能的一个有价值的工具.
  • 它促进了MCO系统中关键催化参数的定量评估.