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相关概念视频

Redox Reactions01:24

Redox Reactions

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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

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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.
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Alcohols from Carbonyl Compounds: Reduction02:23

Alcohols from Carbonyl Compounds: Reduction

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Reduction is a simple strategy to convert a carbonyl group to a hydroxyl group. The three major pathways to reduce carbonyls to alcohols are catalytic hydrogenation, hydride reduction, and borane reduction.
Catalytic hydrogenation is similar to the reduction of an alkene or alkyne by adding H2 across the pi bond in the presence of transition metal catalysts like Raney Ni, Pd–C, Pt, or Ru. Aldehydes and ketones can be reduced by this method, often under mild to moderate heat (25–100°C) and...
13.3K
Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

10.8K
Energy production within a cell involves many coordinated chemical pathways. Most of these pathways are combinations of oxidation and reduction reactions, which occur at the same time. An oxidation reaction strips an electron from an atom in a compound, and the addition of this electron to another compound is a reduction reaction. Because oxidation and reduction usually occur together, these pairs of reactions are called redox reactions.
The removal of an electron from a molecule, results in a...
10.8K
Acid Halides to Alcohols: LiAlH4 Reduction01:19

Acid Halides to Alcohols: LiAlH4 Reduction

4.4K
Acid halides are reduced to alcohols in the presence of a strong reducing agent like lithium aluminum hydride.
The mechanism proceeds in three steps. First, the nucleophilic hydride ion attacks the carbonyl carbon of the acid halide to form a tetrahedral intermediate. Next, the carbonyl group is re-formed, and the halide ion departs as a leaving group, generating an aldehyde. A second nucleophilic attack by the hydride yields an alkoxide ion, which, upon protonation, gives a primary alcohol as...
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Carbon-dioxide Fixation01:28

Carbon-dioxide Fixation

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Carbon dioxide fixation in prokaryotes enables the assimilation of inorganic carbon into organic molecules, supporting biosynthetic pathways, sustaining ecosystems, and contributing to the global carbon cycle. It also has industrial applications in carbon capture and bioproduct synthesis. Autotrophic organisms rely on this process to utilize CO₂ as a carbon source in diverse environments.The Calvin CycleThe Calvin cycle is the most widespread carbon fixation mechanism, primarily used by...
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相关实验视频

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Synthesis and Performance Characterizations of Transition Metal Single Atom Catalyst for Electrochemical CO2 Reduction
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通过金属氧化物接口增强CO2电减

Dunfeng Gao1, Yi Zhang1,2, Zhiwen Zhou1,2

  • 1State Key Laboratory of Catalysis, CAS Center for Excellence in Nanoscience, iChEM, Dalian National Laboratory for Clean Energy, Dalian Institute of Chemical Physics, Chinese Academy of Sciences , Dalian 116023, China.

Journal of the American Chemical Society
|April 11, 2017
PubMed
概括
此摘要是机器生成的。

构建金属氧化物接口,如Au-CeOx,显著提高了电化学二氧化碳减排 (CO2RR) 的效率. 这种策略增强了二氧化碳的吸附和激活,为二氧化碳的转化提供了有前途的途径.

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科学领域:

  • 电化学
  • 材料科学
  • 催化剂

背景情况:

  • 电化学CO2减少反应 (CO2RR) 对于将CO2转化为有价值的产品至关重要.
  • 目前的CO2RR催化剂,主要是过渡金属,在效率和选择性方面面临挑战.
  • 改善CO2RR的策略包括催化剂修改和电解质优化.

研究的目的:

  • 通过构建金属氧化物接口来研究CO2RR的增强.
  • 探讨Au-CeOx对CO2RR的催化活性和法拉第效率.
  • 展示CO2RR增强的接口策略的一般性.

主要方法:

  • Au-CeOx和Ag-CeOx接口的制造和表征.
  • 在现场扫描道显微镜 (STM) 和同步辐射光辐射光谱 (SRPES) 用于接口分析.
  • 密度函数理论 (DFT) 的计算以阐明反应机制.

主要成果:

  • 与单个Au或CeOx相比,Au-CeOx对CO2RR具有显著更高的活性和法拉第效率.
  • Au-CeOx接口增强了CO2的吸附和激活,进一步由基组促进.
  • Ag-CeOx还展示了增强的接口CO2RR,证实了该战略的广泛适用性.

结论:

  • 金属氧化物接口是提高CO2RR性能的一种非常有效的策略.
  • 在接口上的Au和CeOx之间的协同作用促进了CO2的激活,并稳定了关键的*COOH中间体.
  • 这种接口工程方法为开发高效的CO2转换电催化剂提供了有希望的途径.