通过[Co13C2的快速质子转移和进化反应
Cody R Carr1, Atefeh Taheri1, Louise A Berben1
1Department of Chemistry, University of California at Davis, Davis, California 95616, United States.
Journal of the American Chemical Society
|June 24, 2020
概括
这项研究引入了一种碳聚合催化剂,可显著加速质子转移 (PT) 和电子转移 (ET) 反应. 它具有独特的电子结构,可实现扩散限制的反应速度,优于传统方法.
科学领域:
- 电化学
- 催化剂
- 材料科学
背景情况:
- 分子催化剂通常使用质子继电器来提高质子转移 (PT) 速率.
- 不同质的电催化剂通过沃尔默机制促进协同的电子转移 (ET) 和 PT.
- 在各种化学过程中,开发高效的PT和ET催化剂至关重要.
研究的目的:
- 为了研究[Co13C2(CO) 24-4星团的质子转移 (PT) 能力.
- 确定这种催化剂的反应速率和底层机制.
- 将催化性能与现有的分子和异质系统进行比较.
主要方法:
- 在存在和缺少质子的情况下对[Co13C2(CO) 24-4集群的电化学表征.
- 动力分析以确定电子转移 (ET) 和质子转移 (PT) 的速度.
- 与纳米材料和富勒伦的扩散行为进行比较.
主要成果:
- [Co13C2(CO) 244-集群的PT率非常高,为2.3 × 10^9 M^-1 s^-1,表明扩散有限的动力学.
- 快速ET和PT归因于碳集群的移位电子结构.
- 电化学数据显示ET动力学和扩散行为类似于小集群,纳米材料和富勒伦.
结论:
- [Co13C2(CO24]4-集群作为高效的质子转移 (PT) 催化剂.
- 它的移位电子结构促进了快速协同的电子转移 (ET) 和 PT.
- 这一集群显示了电化学反应传统催化剂的优越替代品的潜力.
更多相关视频
10:01Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
Published on: December 4, 2017
12.6K
08:40Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
Published on: December 6, 2021
4.0K
相关概念视频
¹³C NMR: ¹H–¹³C Decoupling
1.5K
The probability of having two carbon-13 atoms next to each other is negligible because of the low natural abundance of carbon-13. Consequently, peak splitting due to carbon-carbon spin-spin coupling is not observed in spectra. However, protons up to three sigma bonds away split the carbon signal according to the n+1 rule, resulting in complicated spectra.
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
A broadband decoupling technique is used to simplify these complex, sometimes overlapping, signals. Broadband decoupling relies on a...
1.5K
Carbon-13 (¹³C) NMR: Overview
7.4K
Carbon-13 is a naturally occurring NMR-active isotope of carbon with a low natural abundance of 1.1%. In contrast, carbon-12 is the most abundant isotope of carbon with zero nuclear spin. Therefore, it is NMR inactive. The gyromagnetic ratio of carbon-13 is smaller than that of protons. As a result, carbon-13 resonance is about 6000 times weaker than proton resonance. For a given magnetic field strength, the resonance frequency of carbon-13 is about one-fourth of the resonance frequency for...
7.4K
¹³C NMR: Distortionless Enhancement by Polarization Transfer (DEPT)
1.5K
When proton-coupled carbon-13 spectra are simplified by a broadband proton decoupling technique, structural information about the coupled protons is lost. Distortionless enhancement by polarization transfer (DEPT) is a technique that provides information on the number of hydrogens attached to each carbon in a molecule. While the DEPT experiment utilizes complex pulse sequences, the pulse delay and flip angle are specifically manipulated. The resulting signals have different phases depending on...
1.5K
Electron Transport Chain: Complex III and IV
8.9K
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...
8.9K
Polyprotic Acids
31.4K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
31.4K
Chemiosmosis
110.3K
Oxidative phosphorylation is a highly efficient process that generates large amounts of adenosine triphosphate (ATP), the basic unit of energy that drives many cellular processes. Oxidative phosphorylation involves two processes— the electron transport chain and chemiosmosis.
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
Electron Transport Chain
The electron transport chain involves a series of protein complexes on the inner mitochondrial membrane that undergo a series of redox reactions. At the end of this chain, the electrons...
110.3K
