模块化电子配置调整,以提高氧化对氨的固定
Bichao Wu1, Lei Huang2, Lvji Yan1
1School of Metallurgy and Environment, Central South University, Changsha 410083, China.
Nano letters
|July 25, 2023
概括
这项研究引入了一种基于的新型催化剂,CoB/Co@C,用于高效的电催化氧化降解 (eNORR) 到氨. 改性催化剂显著提高了氨产量和功率密度,解决了在减轻NO污染方面的关键挑战.
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
- 环境化学环境化学
背景情况:
- 电催化氧化降解 (eNORR) 到氨 (NH3) 为控制NO污染和生产有价值的化学品提供了一种环保的方法.
- eNORR的主要局限性包括反应动力学缓慢和氧化 (NO) 在水性电解质中的溶解性差.
研究的目的:
- 设计和合成一种高效的基于的复合异构结构催化剂,用于电催化氧化的减少.
- 研究集成在调节催化剂电子结构和提高eNORR性能方面的作用.
主要方法:
- 基于的复合催化剂 (CoB/Co@C) 的合理设计和合成,具有异构结构.
- 在Zn-NO电池中为eNORR的催化剂的电化学表征和性能评估.
- 使用计算方法 (隐含) 分析催化剂的电子结构和吸附特性.
主要成果:
- 对于eNORR,CoB/Co@C催化剂实现了高NH3产量,即315.4μmol h-1 cm-2.
- 在Zn-NO电池中记录了3.68 mW cm-2的优异功率密度.
- 发现集成可增强NO吸附,抑制的演化,并防止氧化,促进eNORR.
结论:
- CoB/Co@C复合催化剂在电催化氧化还原方面表现出卓越的性能.
- 和对NO的双位吸附,加上快速的电荷转移,推动了增强的电化学活性.
- 在优化催化剂的过程中起着至关重要的作用,以从NO中有效和选择性生产氨.
更多相关视频
10:57Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
Published on: April 10, 2018
18.3K
13:56Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
Published on: October 12, 2019
7.7K
相关概念视频
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
02:42Valence Bond Theory
8.8K
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...
8.8K
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
02:58Crystal Field Theory - Octahedral Complexes
26.8K
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...
26.8K
01:22Inorganic Nitrogen Assimilation
49
Nitrogen is an essential element in biological systems, forming a crucial component of proteins, nucleic acids, and other cellular constituents. Many bacteria and archaea acquire nitrogen in the form of nitrate (NO₃⁻) or ammonia (NH₃), which are then assimilated into biomolecules through specific enzymatic pathways.Assimilatory Nitrate ReductionWhen nitrate enters the cell, it undergoes a two-step reduction process known as assimilatory nitrate reduction. Initially, the enzyme...
49
03:02Colors and Magnetism
11.9K
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...
11.9K