相关实验视频
Updated: Jul 6, 2025

08:43
Molten-Salt Synthesis of Complex Metal Oxide Nanoparticles
Published on: October 27, 2018
18.0K
原子分散的银原子被纳入了螺旋氧化物 (Co3O4) 中,以促进氧气进化反应
Meilin Zhang1, Jinlei Wang1, Yaqiong Gong1
1School of Chemistry and Chemical Engineering, North University of China, Taiyuan, Shanxi 030051, China.
Journal of colloid and interface science
|January 4, 2024
概括
这项研究引入了一种新的电催化剂,即氧化物纳米粒子中的单个银原子,用于氧气演化反应. 这种新材料表现出增强的活性和稳定性,为催化剂设计提供了一个有前途的方向.
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:
- 贵金属的单个原子被纳入了螺旋氧化物 (Co3O4) 中,它们是有前途的氧化演化反应 (OER) 电催化剂.
- 之前的研究重点是高价值贵金属剂替代八面体Co3+,使四面体替代的作用未被探索.
- 贵金属单个原子在Co3O4四面体位置的催化活性和机制在很大程度上是未知的.
研究的目的:
- 研究一种新型OER电催化剂的性能和机制,该电催化剂在Co3O4纳米粒子中具有四面体替代的单个银 (Ag) 原子.
- 探索CO3O4四面体位点上的贵金属单个原子在OER应用中的潜力.
主要方法:
- 在碳纳米管 (Ag-Co3O4/CNT) 上嵌入在Co3O4纳米粒子中的单个Ag原子的合成.
- 使用高角度环状暗场扫描传输电子显微镜 (HAADF-STEM) 和X射线吸收光谱学 (XAS) 的表征.
- 理论计算以确定首选的替代位点,并了解催化机制.
主要成果:
- 证实了Ag单个原子在Co3O4网格的四面体CO2+位点中成功嵌入.
- Ag和Co3O4之间的电子相互作用促进了电荷转移,提高了OER的性能.
- 农业公司桥梁促进了脱吸过程,显著改善了周转频率和内在活动.
- 在性OER中,Ag-Co3O4/CNT表现出显著的活性 (236 mV在10 mA cm-2) 和强大的稳定性.
结论:
- 在Co3O4中用单个原子Ag取代CO2+的四面体是设计高活性OER电催化剂的可行策略.
- 在增强催化活性和稳定性方面,Ag-Co桥起着至关重要的作用.
- 这项工作为开发基于Co3O4的高效贵金属单原子催化剂提供了新的途径,用于能源转换应用.
相关概念视频
Formation of Complex Ions
23.7K
A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
23.7K
Oxidation-Reduction Reactions
65.0K
Oxidation–Reduction Reactions
65.0K
Redox Reactions
55.7K
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...
55.7K
Redox Equilibria: Overview
564
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...
564
Colors and Magnetism
11.7K
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...
11.7K
Colloidal precipitates
584
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
584

