Jove
Visualize
联系我们
JoVE
x logofacebook logolinkedin logoyoutube logo
关于 JoVE
概览领导团队博客JoVE 帮助中心
作者
出版流程编辑委员会范围与政策同行评审常见问题投稿
图书馆员
用户评价订阅访问资源图书馆顾问委员会常见问题
研究
JoVE JournalMethods CollectionsJoVE Encyclopedia of Experiments存档
教育
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab Manual教师资源中心教师网站
使用条款与条件
隐私政策
政策

相关概念视频

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

9
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
9
Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration02:40

Alkynes to Aldehydes and Ketones: Acid-Catalyzed Hydration

11.1K
Introduction
Analogous to alkenes, alkynes also undergo acid-catalyzed hydration. While the addition of water to an alkene gives an alcohol, hydration of alkynes produces different products such as aldehydes and ketones.
11.1K
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

9.8K
The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
9.8K
Alkynes to Carboxylic Acids: Oxidative Cleavage02:01

Alkynes to Carboxylic Acids: Oxidative Cleavage

7.0K
Alkynes undergo oxidative cleavage in the presence of oxidizing reagents like potassium permanganate and ozone. The triple bond — one σ bond and two π bonds — is completely cleaved, and the alkyne is oxidized to carboxylic acids. When warm and basic aqueous potassium permanganate is used as an oxidizing agent, alkynes are first converted to carboxylate salts via an unstable α-diketone intermediate. Further, a mild acid treatment protonates the carboxylate anions...
7.0K
Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation02:47

Alkynes to Aldehydes and Ketones: Hydroboration-Oxidation

21.6K
Introduction
One of the convenient methods for the preparation of aldehydes and ketones is via hydration of alkynes. Hydroboration-oxidation of alkynes is an indirect hydration reaction in which an alkyne is treated with borane followed by oxidation with alkaline peroxide to form an enol that rapidly converts into an aldehyde or a ketone. Terminal alkynes form aldehydes, whereas internal alkynes give ketones as the final product.
21.6K
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

2.7K
2.7K

您也可能阅读

相关文章

通过共同作者、期刊和引用图与本文相关的文章。

排序
Same author

Heterojunction Gate-Empowered OPECT Aptasensing: A Valid Protocol for Realizing High Current Gain at Low Electron Donor Dependency.

Analytical chemistry·2026
Same author

Dense crystalline-amorphous heterointerface catalysts for freshwater/seawater splitting and small molecule synergistic electrolysis.

Chemical communications (Cambridge, England)·2026
Same author

Mn-Induced Support Stabilization and Ir Electronic Activation Enable Acid-Stable, Low-Loading IrO<sub>2</sub> Water Oxidation.

Advanced science (Weinheim, Baden-Wurttemberg, Germany)·2026
Same author

Supramolecules for Pathogen Inhibition: From Polymers to Self-Assembled Nanosystems.

Accounts of materials research·2026
Same author

Sm-doped RuO<sub>2</sub> electrocatalysts for an acidic oxygen evolution reaction: enhanced activity and stability <i>via</i> electronic structure modulation and oxygen vacancy introduction.

Dalton transactions (Cambridge, England : 2003)·2025
Same author

Bioactive Polysulfate-Based Nano-Assemblies Against Virus Infection.

Small (Weinheim an der Bergstrasse, Germany)·2025

相关实验视频

Updated: Feb 28, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
10:52

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

13.4K

结构上有障碍的CoSx-Co(OH)2异构接口,用于促进性进化反应.

Yulong Dai1, Qinshan Tang1, Yuanxiao Hu1

  • 1State Key Laboratory of Fluorine and Nitrogen Chemicals, School of Chemical Engineering and Technology, Xi'an Jiaotong University, Xi'an, Shaanxi 710049, China.

Journal of colloid and interface science
|February 26, 2026
PubMed
概括

在铜泡上的一种新型失序的硫化物/氧化物异构催化剂显著提高了进化反应 (HER) 在性介质中的动力学. 这种具有成本效益和耐用性的催化剂显示了性电解剂的实际可行性.

关键词:
CoS ((x) -Co ((OH) ((2)) 是一个非常重要的元素.电极定位是一种电极定位.异面接口工程 异面接口工程的演化反应反应.结构上是无序的 结构上是无序的零间隙的电解器

更多相关视频

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
10:21

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Published on: October 5, 2019

9.0K
Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
10:01

Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase

Published on: December 4, 2017

12.8K

相关实验视频

Last Updated: Feb 28, 2026

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics
10:52

Multiscale Sampling of a Heterogeneous Water/Metal Catalyst Interface using Density Functional Theory and Force-Field Molecular Dynamics

Published on: April 12, 2019

13.4K
Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions
10:21

Developing Photosensitizer-Cobaloxime Hybrids for Solar-Driven H2 Production in Aqueous Aerobic Conditions

Published on: October 5, 2019

9.0K
Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase
10:01

Protein Film Infrared Electrochemistry Demonstrated for Study of H2 Oxidation by a [NiFe] Hydrogenase

Published on: December 4, 2017

12.8K

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
  • 纳米技术 纳米技术

背景情况:

  • 演化反应 (HER) 在性介质中比酸性介质慢,需要先进的电催化剂.
  • 结构无序的异构纳米材料提供了无序和复合材料的协同优势.
  • 在催化过程中,基材料是贵金属的经济有效替代品.

研究的目的:

  • 开发一种高性能,耐用,经济高效的性HER电催化剂.
  • 为了研究一个混乱的硫化物/氧化物异构结构 (CoSx-Co(OH) 2) 对催化活性的协同效应.
  • 评估开发的催化剂在性水电解器中的实际可行性.

主要方法:

  • 在3D微孔铜泡 (CF) 骨架上放置CoSx-Co(OH) 2异构的现场电解.
  • 电化学表征包括半细胞HER测试和Tafel斜率分析.
  • 耐用性测试超过1000个周期和500小时的连续运行.
  • 一个紧的零间隙性电解仪的制造和测试.
  • 密度函数理论 (DFT) 计算以阐明反应机制.

主要成果:

  • CoSx-Co(OH) 2 / CF催化剂在1M KOH中实现了10mA cm-2的电流密度,在88mV的超电位与RHE相比,1M KOH.
  • 催化剂表现出有利的81.1 mV dec-1的塔菲尔斜率,低电荷转移电阻,以及扩大的电化学活性表面积.
  • 经过1000个周期和500小时的测试,证明了特殊的耐用性,电解仪在500mA cm-2下稳定运行240小时.
  • DFT计算显示,在异质接口内有一个内置的电场,可以促进电子运输,优化吸附/脱吸.

结论:

  • 在CF上结构失序的CoSx-Co(OH) 2异构结构为性HER提供了高度活跃和稳定的电催化剂.
  • 不同界面的协同效应,包括增强的水解离和H*转化,显著提高了催化动力学.
  • 催化剂证明了高效和耐用的性水电解的实际可行性,提供了一个有希望的非贵金属替代品.