基于碳的电催化剂中的双金属桥梁协调,用于pH-通用氧气减少
Xinxin Shu1, Dongxing Tan1, Yueqing Wang1
1Key Laboratory for Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University, Jinan, 250100, China.
Angewandte Chemie (International ed. in English)
|December 8, 2023
概括
原子分散的二原子电催化剂,以大自然为灵感,提供高效的氧气减少. 这项研究为这些先进的催化剂引入了一种新的合成方法,增强了电催化活性.
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:
- 原子分散金属位点 (例如,金属--碳) 是用于电催化反应的高贵金属催化剂的有希望的替代品.
- 在调节这些原子位点和理解它们的相互作用方面仍然存在挑战.
研究的目的:
- 开发一种用于制备具有可控制双金属活性位点的二原子电催化剂的新策略.
- 研究这些新型催化剂的微观结构和电催化性能.
- 了解这些催化剂促进的氧气减少机制.
主要方法:
- 采用超分子组装型材涂层策略,使用普鲁士蓝色类似物 (PBA) 作为超分子支上的双金属来源.
- 进行了详细的微观结构分析,以表征金属--碳部位.
- 对各种电解质 (性,中性和酸性) 中的氧降解反应,评估了电催化性能.
主要成果:
- 一系列具有可调节的金属--碳位点 (Zn-N4和Fe-N5) 的二原子电催化剂成功合成.
- 独特的微观结构模仿了诸如细胞染色体c氧化酶之类的天然酶,使得高效的四电子氧降解成为可能.
- 具有d10电子配置的组元素 (Zn,Cd) 由于改善了结合协调,显著增强了电催化活性.
结论:
- 拟议的超分子组装型材涂层策略为合成先进的二原子电催化剂提供了一种通用方法.
- 这些发现为氧气激活和减少提供了机理性的见解,为高效的电催化剂铺平了道路.
- 这项工作促进了各种应用的无贵金属电催化剂的开发.
相关概念视频
02:51Metal-Ligand Bonds
20.8K
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...
20.8K
02:42Valence Bond Theory
8.6K
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...
8.6K
02:50Catalysis
27.0K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
27.0K
02:34Structural Isomerism
19.2K
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...
19.2K
02:17Reduction of Alkenes: Asymmetric Catalytic Hydrogenation
3.3K
Catalytic hydrogenation of alkenes is a transition-metal catalyzed reduction of the double bond using molecular hydrogen to give alkanes. The mode of hydrogen addition follows syn stereochemistry.
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
The metal catalyst used can be either heterogeneous or homogeneous. When hydrogenation of an alkene generates a chiral center, a pair of enantiomeric products is expected to form. However, an enantiomeric excess of one of the products can be facilitated using an enantioselective reaction or an...
3.3K
02:24Polar Covalent Bonds
20.5K
Covalent bonds are formed between two atoms when both have similar tendencies to attract electrons to themselves (i.e., when both atoms have identical or fairly similar ionization energies and electron affinities). Nonmetal atoms frequently form covalent bonds with other nonmetal atoms. For example, the hydrogen molecule, H2, contains a covalent bond between its two hydrogen atoms. When two separate hydrogen atoms with a particular potential energy approach each other, their valence orbitals...
20.5K