相关实验视频
Updated: Jun 19, 2026

08:45
Fabrication of Spatially Confined Complex Oxides
Published on: July 1, 2013
在氧化中工程晶格扭曲使得通过直接O-O合实现强大的酸性水氧化
Yin'an Zhu1,2, Fei Wu1,2, Xiaozan Zhang1,2
1Zhejiang Key Laboratory of Advanced Fuel Cells and Electrolyzers Technology, Ningbo Institute of Materials Technology and Engineering, Chinese Academy of Sciences, Ningbo, Zhejiang, 315201, P. R. China.
Advanced materials (Deerfield Beach, Fla.)
|April 7, 2025
概括
氧化物在水电解中的稳定性通过与Na+和Hf4+的联合兴奋剂得到改善. 这种格子扭曲通过新的催化途径提高了氧演化反应 (OER) 的活性和耐久性.
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:
- 基于 (Ru) 的电催化剂是的有希望的替代品,用于质子交换膜水电解 (PEMWE).
- 现有的基于Ru的催化剂在氧化演化反应 (OER) 期间在酸性条件下表现出不良稳定性,限制了它们的应用.
研究的目的:
- 为了提高二氧化 (RuO2) 的稳定性和活性,用于酸性OER.
- 将OER催化机制从吸附物演化机制 (AEM) 转移到氧化物通路机制 (OPM).
主要方法:
- 通过与大半径离子 (Na+和Hf4+) 联合化RuO2进行格子扭曲工程.
- 使用现场振动光谱和理论计算来确认催化机制.
- 在PEMWE设备中测试修改后的RuO2.
主要成果:
- 协同兴奋剂诱导了RuO2的显著晶格扭曲,优化了其电子结构,缩短了Ru─Ru键距离.
- 修改后的催化剂促进了O-O基直接合,切换到OPM.
- 在1.646V时达到1A cm-2的电流密度,并在0.5A cm-2.2时经过85小时的稳定运行.
结论:
- 通过协同兴奋剂进行格子扭曲工程是一种有效的策略,可以改善酸性OER的RuO2稳定性和活性.
- 通过邻近的Ru站点之间的协同相互作用来促进直接的O-O合,可以提高催化性能.
相关概念视频
Corrosion
23.5K
The degradation of metals due to natural electrochemical processes is known as corrosion. Rust formation on iron, tarnishing of silver, and the blue-green patina that develops on copper are examples of corrosion. Corrosion involves the oxidation of metals. Sometimes it is protective, such as the oxidation of copper or aluminum, wherein a protective layer of metal oxide or its derivatives forms on the surface, protecting the underlying metal from further oxidation. In other cases, corrosion is...
23.5K
Metal-Ligand Bonds
20.4K
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...
20.4K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide
9.7K
Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
9.7K
Oxidation of Alkenes: Anti Dihydroxylation with Peroxy Acids
5.5K
Diols are compounds with two hydroxyl groups. In addition to syn dihydroxylation, diols can also be synthesized through the process of anti dihydroxylation. The process involves treating an alkene with a peroxycarboxylic acid to form an epoxide. Epoxides are highly strained three-membered rings with oxygen and two carbons occupying the corners of an equilateral triangle. This step is followed by ring-opening of the epoxide in the presence of an aqueous acid to give a trans diol.
5.5K
Oxidative Cleavage of Alkenes: Ozonolysis
9.8K
In ozonolysis, ozone is used to cleave a carbon–carbon double bond to form aldehydes and ketones, or carboxylic acids, depending on the work-up.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
Ozone is a symmetrical bent molecule stabilized by a resonance structure.
9.8K
Acid-Catalyzed Ring-Opening of Epoxides
7.0K
Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
7.0K

