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

Factors Affecting Solubility04:01

Factors Affecting Solubility

33.3K
Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.3K
Calculating pH Changes in a Buffer Solution02:45

Calculating pH Changes in a Buffer Solution

53.0K
A buffer can prevent a sudden drop or increase in the pH of a solution after the addition of a strong acid or base up to its buffering capacity; however, such addition of a strong acid or base does result in the slight pH change of the solution. The small pH change can be calculated by determining the resulting change in the concentration of buffer components, i.e., a weak acid and its conjugate base or vice versa. The concentrations obtained using these stoichiometric calculations can be used...
53.0K
Mixtures of Acids03:27

Mixtures of Acids

19.6K
The pH of a solution containing an acid can be determined using its acid dissociation constant and its initial concentration. If a solution contains two different acids, then its pH can be determined using one of several methods depending upon the relative strength of the acids and their dissociation constants.
A Mixture of a Strong Acid and a Weak Acid
In a mixture of a strong acid and a weak acid, the strong acid dissociates completely and becomes a source of almost all the hydronium ions...
19.6K
Turbulent Flow: Problem Solving01:09

Turbulent Flow: Problem Solving

102
Carbonation is a process used to dissolve carbon dioxide gas in a liquid, commonly used in the production of carbonated beverages. Achieving efficient carbonation requires careful control of temperature, pressure, and flow conditions. By adjusting these parameters, carbonation efficiency can be maximized, producing a higher concentration of CO2 in the liquid.
Temperature is a key factor in CO2 solubility. In this case, the CO2 gas and the liquid are cooled to 20°C. Lower temperatures...
102
Polyprotic Acids03:38

Polyprotic Acids

29.1K
Acids are classified by the number of protons per molecule that they can give up in a reaction. Acids such as HCl, HNO3, and HCN that contain one ionizable hydrogen atom in each molecule are called monoprotic acids. Their reactions with water are:
29.1K
Relative Strengths of Conjugate Acid-Base Pairs02:29

Relative Strengths of Conjugate Acid-Base Pairs

45.4K
Brønsted-Lowry acid-base chemistry is the transfer of protons; thus, logic suggests a relation between the relative strengths of conjugate acid-base pairs. The strength of an acid or base is quantified in its ionization constant, Ka or Kb, which represents the extent of the acid or base ionization reaction. For the conjugate acid-base pair HA / A−, the ionization equilibrium equations and ionization constant expressions are
45.4K

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

Phase Engineering of Pd-Te Hexagonal Nanoplates for Enhancing Nitrogen Oxidation.

Journal of the American Chemical Society·2026
Same author

Goblet-Like P-Driven Pt<sub>3</sub>Mn Alloys Enable High Power Density and 1000 h Durability in Practical Fuel Cells.

Journal of the American Chemical Society·2026
Same author

Ammonia mediated electrostatic adsorption synthesis of paired subnanoclusters with enhanced hydrogen oxidation performance.

Nature communications·2026
Same author

Isolating Coupled Effects by Interface Editing of Intermetallic Heterostructures for Fuel Cells.

Journal of the American Chemical Society·2026
Same author

Molybdenum-Pocket Driven Low-Platinum Oxygen Reduction Catalysts for 100-Watt-Scale Fuel Cell Stacks.

Advanced materials (Deerfield Beach, Fla.)·2026
Same author

Phthalocyanine-Derived Platform toward Integrated Ultralow-Platinum Fuel Cell Catalysts.

Nano letters·2026

相关实验视频

Updated: Jun 14, 2025

CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
07:08

CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light

Published on: June 12, 2019

6.8K

用为媒介的界面微环境来提高pH-通用CO2减少

Tingjie Mao1, Dajie Lin1, Xiang Han1

  • 1Wenzhou Key Lab of Advanced Energy Storage and Conversion, Zhejiang Province Key Lab of Leather Engineering, College of Chemistry and Materials Engineering, Wenzhou University, Wenzhou, Zhejiang, 325035, China.

Advanced materials (Deerfield Beach, Fla.)
|June 13, 2025
PubMed
概括

将引入催化剂可以显著增强对一氧化碳的二氧化碳还原反应 (CO2RR). 这种优化的催化剂在广泛的pH范围内表现出了显著的稳定性和效率,抑制了竞争的进化反应 (HER).

关键词:
这就是CO2RR的原因.在这里,我们可以看到它.原子集群是一个原子集群.微观环境是一个微观环境.单个原子中的单个原子.

更多相关视频

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
Biofilm Removal Using Carbon Dioxide Aerosols without Nitrogen Purge
07:11

Biofilm Removal Using Carbon Dioxide Aerosols without Nitrogen Purge

Published on: November 6, 2016

6.4K

相关实验视频

Last Updated: Jun 14, 2025

CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light
07:08

CO2 Photoreduction to CH4 Performance Under Concentrating Solar Light

Published on: June 12, 2019

6.8K
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
Biofilm Removal Using Carbon Dioxide Aerosols without Nitrogen Purge
07:11

Biofilm Removal Using Carbon Dioxide Aerosols without Nitrogen Purge

Published on: November 6, 2016

6.4K

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
  • 催化剂是一种催化剂.

背景情况:

  • 对附加值化学品进行有效和稳定的二氧化碳还原反应 (CO2RR) 是至关重要的,但由于复杂的气体-固体-液体接口而受到阻碍.
  • 竞争性演变反应 (HER) 通常会降低CO2RR的选择性和效率,特别是在工业电流密度下.
  • 在三相接口上控制当地的微环境是优化CO2RR性能的关键.

研究的目的:

  • 通过调节当地的微环境来提高 (Ni) 物种的CO2RR性能.
  • 为了抑制竞争的演化反应 (HER),提高CO2RR的选择性和效率.
  • 在工业电流密度下,在通用pH范围内实现高性能CO2RR.

主要方法:

  • 在催化剂 (Ni/FC) 中引入高电负性 (F),以修改三相接口.
  • 在广泛的pH范围内对CO2RR和HER性能进行电化学表征.
  • 在现场实验和密度函数理论 (DFT) 计算以阐明反应机制.

主要成果:

  • 优化的Ni/FC催化剂在pH-通用条件下实现了超过90%的法拉第效率,将CO2转化为CO.
  • 在200 mA cm−2下,Ni/FC在3000多个小时内表现稳定,性能优于大多数报告的CO2RR电催化剂.
  • 的引入产生了正碳中心 (Cδ+),抑制了吸附和水解离,从而抑制了HER.

结论:

  • 通过引入负电子元素来调节三相接口的局部微环境是促进CO2RR的有效策略.
  • 用改性Ni/FC催化剂为高效和稳定的二氧化碳转化为二氧化碳提供了一个有前途的解决方案.
  • 这项工作为设计先进的电催化剂提供了新的视角,通过抑制竞争性的 HER.