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相关概念视频

Lewis Acids and Bases02:33

Lewis Acids and Bases

43.5K
In 1923, G. N. Lewis proposed a generalized definition of acid-base behavior in which acids and bases are identified by their ability to accept or to donate a pair of electrons and form a coordinate covalent bond.
A coordinate covalent bond (or dative bond) occurs when one of the atoms in the bond provides both bonding electrons. For example, a coordinate covalent bond occurs when a water molecule combines with a hydrogen ion to form a hydronium ion. A coordinate covalent bond also results when...
43.5K
Enolate Mechanism Conventions01:15

Enolate Mechanism Conventions

2.1K
When a carbonyl compound is treated with a strong base, the α position gets deprotonated to give a resonance-stabilized intermediate called an enolate. Enolates are ambident nucleophiles because they possess two nucleophilic sites that can attack an electrophile owing to the delocalization of the negative charge between the α carbon and oxygen atoms. When the oxygen atom attacks an electrophile, it is called O-attack, whereas electrophilic attack via the α carbon is known as...
2.1K
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
Lewis Structures of Molecular Compounds and Polyatomic Ions02:54

Lewis Structures of Molecular Compounds and Polyatomic Ions

34.5K
To draw Lewis structures for complicated molecules and molecular ions, it is helpful to follow a step-by-step procedure as outlined:
34.5K
Lewis Symbols and the Octet Rule02:36

Lewis Symbols and the Octet Rule

62.8K
Chemical bonds are complex interactions between two or more atoms or ions, which reduce the potential energy of the molecule. Gilbert N. Lewis developed a model called the Lewis model that simplified the depiction of chemical bond formation and provided straightforward explanations for the chemical bonds seen in most common compounds.
62.8K
Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

9.9K
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.
9.9K

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相关实验视频

Updated: Jun 5, 2025

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
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Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether

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易斯酸位点辅助 PtCu/CeO-C 允许高性能氧气减排.

Yangyang Ren1, Beibei Li1, Guichao Zhang1

  • 1School of Materials Science and Engineering, Hebei University of Technology, Tianjin, 300130, China.

Small (Weinheim an der Bergstrasse, Germany)
|December 11, 2024
PubMed
概括

本研究介绍了一种新的铜合金催化剂,由二氧化 (PtCu/CeO2-C) 支持,用于氧降解反应 (ORR). 这种先进的催化剂显著提高了耐用性和活性,这对于清洁能源应用至关重要.

关键词:
路易斯酸的网站网站金属氧化物支持支持.金属支的相互作用.氧降解反应反应的氧降解反应金金金是什么意思

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

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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy

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相关实验视频

Last Updated: Jun 5, 2025

Tuning the Acidity of Pt/ CNTs Catalysts for Hydrodeoxygenation of Diphenyl Ether
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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy
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Characterizing Lewis Pairs Using Titration Coupled with In Situ Infrared Spectroscopy

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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:

  • 开发持久且活跃的低 (Pt) 纳米催化剂对于推进清洁能源技术至关重要.
  • 氧降解反应 (ORR) 是燃料电池中的一个关键过程,需要高效的催化剂.

研究的目的:

  • 开发一种高效的二氧化 (CeO2) 支持的铜 (PtCu) 合金催化剂 (PtCu/CeO2-C) 用于ORR在酸性介质中.
  • 研究CeO2支持在增强催化剂稳定性和活性方面的作用.

主要方法:

  • PtCu/CeO2-C纳米催化剂的合成.
  • 电化学表征包括0.9V的特异性和质量活性测量.
  • 理论研究以了解催化机制,重点关注氧气空缺 (VO).

主要成果:

  • 与商业Pt/C相比,PtCu/CeO2-C的特异活性 (9.9倍) 和质量活性 (6.1倍) 显著更高.
  • CeO2 支持有效定 PtCu 颗粒,防止迁移并增强长期稳定性.
  • 理论分析证实,CeO2上的氧气空缺促进了O2的吸附/解离,并优化了Pt电子结构,以实现高效的4电子ORR通路.

结论:

  • 支持的基于Pt的催化剂的合理设计,利用CeO2等材料,对于提高ORR效率非常有效.
  • 由于其卓越的活性和耐用性,PtCu/CeO2-C是清洁能源应用的有希望的催化剂.
  • 了解支材料和缺陷的作用,例如氧气空缺,是设计下一代电催化剂的关键.