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相关概念视频

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.1K
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.
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Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

10.2K
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.
10.2K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.3K
Electrocyclic reactions are reversible reactions. They involve an intramolecular cyclization or ring-opening of a conjugated polyene. Shown below are two examples of electrocyclic reactions. In the first reaction, the formation of the cyclic product is favored. In contrast, in the second reaction, ring-opening is favored due to the high ring strain associated with cyclobutene formation.
2.3K
Electrochemistry: Overview01:04

Electrochemistry: Overview

2.0K
Electrochemistry is the branch of chemistry that studies the relationship between electrical quantities and chemical reactions, particularly oxidation and reduction. Oxidation is the loss of electrons from a substance, whereas reduction refers to the gain of electrons. A substance with a strong electron affinity is called an oxidizing agent (oxidant), and a reducing agent (reductant) is a species that donates electrons. Oxidation and reduction processes are pivotal to electrochemical reactions,...
2.0K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

11.3K
Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
11.3K
Electrolysis03:00

Electrolysis

26.3K
In a galvanic cell, the electrical work is done by a redox system on its surroundings as electrons produced by the spontaneous redox reactions are transferred through an external circuit. Alternatively, an external circuit does work on a redox system by imposing a voltage sufficient to drive an otherwise nonspontaneous reaction in a process known as electrolysis. For instance, recharging a battery involves the use of an external power source to drive the spontaneous (discharge) cell reaction in...
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Updated: Jun 24, 2025

Electrochemical Detection of Deuterium Kinetic Isotope Effect on Extracellular Electron Transport in Shewanella oneidensis MR-1
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通过d-p轨道电子合增强的电化学氧气进化.

Ning Sun1, Zhichuan Zheng1, Zhuangzhuang Lai2

  • 1State Key Laboratory of Information Photonics and Optical Communications, School of Science, Beijing University of Posts and Telecommunications, Beijing, 100876, China.

Advanced materials (Deerfield Beach, Fla.)
|June 1, 2024
PubMed
概括

高的金属三硫化物为氧化演化反应电催化提供了一个新的平台. 这项研究证明了它们的特殊活动和稳定性,为先进的能源应用铺平了道路.

关键词:
密度的功能计算密度的计算.dp 轨道杂交的情况.电化学氧气演变的演变高性化合物是一种高性化合物.范德瓦尔斯的材料

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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:

  • 高材料,包括合金,氧化物和氧化物,对电催化有希望,但存在活性缺陷.
  • 在多元组件系统中定制结构-活动关系对于提高电催化性能至关重要.

研究的目的:

  • 开发一种新型的高材料,用于高效的氧化演化反应 (OER) 电催化.
  • 研究高系统中的结构-活动关系和性能增强机制.

主要方法:

  • 制造一个二维高金属三硫化物,特别是 (MnFeCoNiZn) PS3.3.
  • 对OER进行电催化性能测试,包括超电位,Tafel斜率和长期稳定性测量.
  • 密度函数理论 (DFT) 计算以阐明电子结构和催化机制.

主要成果:

  • (MnFeCoNiZn) PS3材料表现出极好的OER活性,在10 mA cm−2时具有240 mV的低超电位,以及32 mV dec−1.1的最小Tafel斜率.
  • 催化剂表现出了显著的稳定性,在不同电流密度下的96小时运行中,降解程度微不足道.
  • DFT的计算显示,d-p轨道杂交和活性中心的贡献提高了催化性能.

结论:

  • 在高离子调节过渡金属化合物中,以驱动的组合工程是设计先进的OER电催化剂的有效策略.
  • 开发的2D高金属三硫化物为优化电子协调环境和提高催化效率提供了一个多功能平台.
  • 这项工作为为能源相关应用开发下一代催化剂提供了有前途的方法.