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相关概念视频

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

143
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...
143
Electrochemical Cells01:28

Electrochemical Cells

424
Electrochemical cells are systems that convert chemical energy into electrical energy or use electrical energy to drive chemical reactions. They consist of two electrodes in contact with an electrolyte, where redox reactions enable electron transfer. Most electrochemical cells include two half-cells connected by an external wire for electron flow and a salt bridge for ion flow. The salt bridge contains an electrolyte solution and maintains charge neutrality by allowing ions—not...
424
Catalysis01:27

Catalysis

10
Catalysis influences the rate of chemical reactions by providing an alternative reaction pathway with lower activation energy. A catalyst speeds up a reaction, but it is not consumed during the process. The fundamental principle of catalysis is the ability of a catalyst to alter the reaction mechanism, often introducing a more efficient pathway than the uncatalyzed process.In a catalyzed reaction, the catalyst participates directly in the reaction mechanism. It interacts with reactants to form...
10
Catalysis02:50

Catalysis

23.1K
The presence of a catalyst affects the rate of a chemical reaction. A catalyst is a substance that can increase the reaction rate without being consumed during the process. A basic comprehension of a catalysts’ role during chemical reactions can be understood from the concept of reaction mechanisms and energy diagrams.
23.1K
Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

2.2K
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.
2.2K

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相关实验视频

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On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method
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On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method

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对氧演化反应的异质电催化剂进行基准测试.

Charles C L McCrory1, Suho Jung, Jonas C Peters

  • 1Joint Center for Artificial Photosynthesis and †Division of Chemistry and Chemical Engineering, California Institute of Technology , Pasadena, California 91125, United States.

Journal of the American Chemical Society
|November 1, 2013
PubMed
概括

一个新的协议标准化了用于能源技术的氧化电催化剂的评估. 非贵金属催化剂在性溶液中表现相似,但在酸性条件下缺乏稳定性,与氧化不同.

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
  • 可再生能源可再生能源是可再生能源.

背景情况:

  • 对电催化剂的客观评估对于开发能源转换技术至关重要,例如太阳能水分装置,水电解剂和空气电池.
  • 目前评估氧化催化剂的方法缺乏标准化,这阻碍了材料活性和稳定性的比较.

研究的目的:

  • 报告一个标准化的协议,用于评估活动,稳定性和电子沉积氧化电催化剂的法拉第效率.
  • 专注于确定电化学活性表面积和测量催化活性和稳定性在与集成太阳能水分装置相关的条件下.

主要方法:

  • 开发了一种评估电催化剂性能的协议,重点关注电化学活性表面积的确定.
  • 在模拟的太阳分水条件下测量了电催化活性和稳定性,使用10 mA cm-2几何电流密度的过电势作为关键指标.
  • 在酸性和性溶液中研究了各种电沉积催化剂 (Co,Ni基系统和IrO(x)).

主要成果:

  • 在性溶液中,非贵金属电催化剂 (CoOx,CoPi,CoFeOx,NiOx,NiCeOx,NiCoOx,NiCuOx,NiFeOx,NiLaOx) 在类似的超电位 (0.350.43 V) 时达到10 mA cm−2.
  • 除了电沉积氧化 (IrO(x) 之外,所有研究的系统在酸性溶液中的氧化条件下都表现出不稳定.
  • 该协议允许使用表面积测量来确定电催化剂的周转频率.

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

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12:12

On the Preparation and Testing of Fuel Cell Catalysts Using the Thin Film Rotating Disk Electrode Method

Published on: March 16, 2018

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结论:

  • 开发的协议提供了一种标准化的方法来比较氧化电催化剂.
  • 非贵金属催化剂在性介质中表现出有希望的活性,但需要进一步开发以在酸性环境中保持稳定性.
  • 氧化在酸性条件下仍然是一个稳定的替代品,尽管它的活性和成本效益需要考虑.