![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)
工程不对称地协调Fe站点通过异原子对协同贡献有效的氧气减少
Qizheng An1, Xu Zhang2, Chenyu Yang1
1National Synchrotron Radiation Laboratory, University of Science and Technology of China, Hefei, Anhui, 230029, P. R. China.
Small (Weinheim an der Bergstrasse, Germany)
|August 11, 2023
概括
单原子Fe催化剂显示出改善的氧降解反应 (ORR) 活性. 使用异构原子对 (Co和B) 的新策略优化了Fe位点,提高了ORR效率,超出了商业催化剂.
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
- 催化剂是一种催化剂.
背景情况:
- 单原子Fe催化剂对氧减少反应 (ORR) 是有前途的.
- 在Fe位点周围的对称N协调导致强烈的*OOH中间吸附,限制ORR性能.
- 需要一个新的策略来优化Fe活性站点,以实现高效的ORR.
研究的目的:
- 为单原子Fe催化剂开发"异原子对协同调节"战略.
- 为了改进ORR,将Fe站点的协调环境和旋转状态定制为增强的ORR.
- 为了克服ORR中中间产品吸附的局限性.
主要方法:
- 在N-化碳 (Fe─B─Co/NC) 上合成不对称的Co和B异原子协调的Fe单位.
- 电化学表征以评估ORR活动 (半波潜力,动力电流密度).
- 在现场电化学阻抗和同步红外光谱学研究反应机制.
主要成果:
- Fe─B─Co/NC催化剂表现出极好的ORR活性,其高半波电位 (E1/2) 为0.891 V,动力电流密度 (Jk) 为60.6 mA cm−2.2.
- 性能超过了商业Pt/C催化剂的性能.
- 现场研究显示,O2向*O中间体的加速演变以及*OOH*的高效O-O键裂变.
结论:
- 异原子对协同调节策略有效地优化ORR的Fe单个位点.
- 不对称的Co和B协调通过改善中间吸附和O-O键裂解来增强催化活性.
- 这种方法为设计高性能ORR电催化剂提供了一个有希望的途径.
更多相关视频
08:31Anaerobic Protein Purification and Kinetic Analysis via Oxygen Electrode for Studying DesB Dioxygenase Activity and Inhibition
Published on: October 3, 2018
8.5K
10:57Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
18.3K
相关概念视频
01:43Electron Transport Chain: Complex III and IV
7.6K
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...
7.6K
03:11Oxidation-Reduction Reactions
65.2K
Oxidation–Reduction Reactions
65.2K
02:34Structural Isomerism
19.4K
Isomerism in Complexes
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
Isomers are different chemical species that have the same chemical formula. Structural isomerism of coordination compounds can be divided into two subcategories, the linkage isomers and coordination-sphere isomers.
Linkage isomers occur when the coordination compound contains a ligand that can bind to the transition metal center through two different atoms. For example, the CN− ligand can bind through the carbon atom or through the nitrogen atom. Similarly, SCN− can...
19.4K
01:23Redox Equilibria: Overview
587
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...
587
01:19Oxidation and Reduction of Organic Molecules
6.7K
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...
The removal of an electron from a molecule, results in a...
6.7K
02:51Metal-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...
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