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

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.2K
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...
3.2K
Controlled-Potential Coulometry: Electrolytic Methods01:17

Controlled-Potential Coulometry: Electrolytic Methods

130
Controlled-potential coulometry, also known as potentiostatic coulometry, employs a three-electrode system in which the working electrode's potential is precisely regulated using a potentiostat. Platinum working electrodes are utilized for positive potentials, while mercury pool electrodes are favored for extremely negative potentials. The platinum counter electrode is separated from the analyte using a membrane or salt bridge to avoid interference in the analysis.
The chosen potential...
130
Photochemical Electrocyclic Reactions: Stereochemistry01:26

Photochemical Electrocyclic Reactions: Stereochemistry

1.8K
The absorption of UV–visible light by conjugated systems causes the promotion of an electron from the ground state to the excited state. Consequently, photochemical electrocyclic reactions proceed via the excited-state HOMO rather than the ground-state HOMO. Since the ground- and excited-state HOMOs have different symmetries, the stereochemical outcome of electrocyclic reactions depends on the mode of activation; i.e., thermal or photochemical.
Selection Rules: Photochemical Activation
1.8K

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

Pure Carbon Triggers Nitrogen Reduction: The Critical Role of Spin Electrons Induced at <i>sp</i><sup>3</sup>/<i>sp</i><sup>2</sup> Carbon Interfaces.

Journal of the American Chemical Society·2026
Same author

Breaking the O<sub>2</sub> Activation Bottleneck via Synergistic Electronic Polarization at Adjacent Co-Mn Sites in N-Doped Carbon.

Chemistry (Weinheim an der Bergstrasse, Germany)·2026
Same author

Decoupling Kinetically Coupled Steps via Hierarchical Relay Catalysis on High-Entropy Alloy for Efficient Ammonia Decomposition.

Angewandte Chemie (International ed. in English)·2026
Same author

Strong Donor-Acceptor Effect Enables Efficient Polyiodides Confinement and Fast Redox Kinetics Toward Zinc-Iodine Batteries.

Angewandte Chemie (International ed. in English)·2026
Same author

Steering Intermediate Coupling by Alkali-Metal Cations for Efficient Nitrate Electroreduction to Ammonia.

Angewandte Chemie (International ed. in English)·2026
Same author

Synthesis of atomically dispersed catalysts via hydrogen embrittlement-like assisted thermal activation for acidic oxygen reduction.

Nature communications·2026

相关实验视频

Updated: Jun 1, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
10:57

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

18.1K

"Cu-N"为电催化CO2的场所驱动的选择性开关减少.

Xinyue Ma1, Jie Shao1, Baoguang Mao1

  • 1State Key Laboratory of Organic-Inorganic Composites, Beijing University of Chemical Technology, Beijing 100029, China.

ACS applied materials & interfaces
|January 20, 2025
PubMed
概括

催化剂中铜活性位点的固体效应显著影响电化学二氧化碳还原反应 (eCO2RR) 路径. 使用二胺异构体的催化剂设计控制了产品的选择性,有利于C2H4或CH4的生产.

关键词:
催化机制是一种催化机制.电催化二氧化碳减排反应的电催化反应.绝缘效应 绝缘效应 绝缘效应结构绩效相关性可调节的选择性选择性

更多相关视频

Author Spotlight: Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
10:59

Author Spotlight: Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy

Published on: May 12, 2023

2.3K
Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
09:18

Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications

Published on: June 21, 2017

11.4K

相关实验视频

Last Updated: Jun 1, 2025

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
10:57

Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction

Published on: April 10, 2018

18.1K
Author Spotlight: Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy
10:59

Author Spotlight: Tracking Electrochemistry on Single Nanoparticles with Surface-Enhanced Raman Scattering Spectroscopy and Microscopy

Published on: May 12, 2023

2.3K
Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications
09:18

Simple Methods for the Preparation of Non-noble Metal Bulk-electrodes for Electrocatalytic Applications

Published on: June 21, 2017

11.4K

科学领域:

  • 催化剂是一种催化剂.
  • 电化学 电化学 电化学
  • 材料科学 材料科学 材料科学

背景情况:

  • 了解活性站点的化学环境对于开发电化学二氧化碳还原反应 (eCO2RR) 的有效催化剂至关重要.
  • 定制催化剂结构可以显著影响反应通路和产品选择性.

研究的目的:

  • 研究铜-活性位点中的固体阻碍对eCO2RR选择性的影响.
  • 设计模型催化剂,使用不同异二胺异构体来控制固态效应.

主要方法:

  • 模型催化剂的合成通过协调铜离子与正,甲和二异构体 (oPD,mPD,ppD).
  • 对eCO2RR的催化剂性能进行电化学评估.
  • 分析反应中间体和受固体效应影响的反应途径.

主要成果:

  • Cu-oPD催化剂显示出增强的C-C合,导致对C2H4.4的选择性更高.
  • Cu-pPD催化剂促进了*CHO中间体的化,有利于CH4的合成.
  • 由于在速率决定步骤中自由能障碍较高,Cu-mPD催化剂的活性较低,主要产生H2.

结论:

  • 活动部位周围的无菌效应在控制eCO2RR的选择性方面发挥着至关重要的作用.
  • 基于控制硬体相互作用的催化剂设计提供了一种可行的策略,用于调整CO2减排中的产品分配.