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相关概念视频

Catalysis02:50

Catalysis

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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.
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Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

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Alkenes are converted to 1,2-diols or glycols through a process called dihydroxylation. It involves the addition of two hydroxyl groups across the double bond with two different stereochemical approaches, namely anti and syn. Dihydroxylation using osmium tetroxide progresses with syn stereochemistry.
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Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis01:13

Esters to Carboxylic Acids: Acid-Catalyzed Hydrolysis

3.0K
Hydrolysis of esters under acidic conditions proceeds through a nucleophilic acyl substitution. In the presence of excess water, the reaction proceeds in a reversible manner, forming carboxylic acids and alcohols.
During hydrolysis, the ester is first activated towards nucleophilic attack through the protonation of the carboxyl oxygen atom by the acid catalyst. The protonation makes the ester carbonyl carbon more electrophilic. In the next step, water acts as a nucleophile and adds to the...
3.0K
Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

3.4K
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...
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Acid-Catalyzed Ring-Opening of Epoxides02:24

Acid-Catalyzed Ring-Opening of Epoxides

7.4K
Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...
7.4K
Reactivity of Enolate Ions01:23

Reactivity of Enolate Ions

2.6K
Enolate ions are formed by the acid–base reaction of a carbonyl compound with a base. This leads to deprotonation of the α hydrogen atom, leading to a resonance-stabilized enolate ion where one of the contributing structures is an oxyanion, which imparts additional stability. Therefore, the proton on the α carbon is more acidic in nature than that of other sp3-hybridized C–H bonds but less acidic than those in O–H bonds where the negative charge in the conjugate...
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In situ FTIR Spectroscopy as a Tool for Investigation of Gas/Solid Interaction: Water-Enhanced CO2 Adsorption in UiO-66 Metal-Organic Framework
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对于酸性OER的二维基于Ir的催化剂.

Hao Yu1,2, Jia Ke1, Qi Shao1

  • 1College of Chemistry, Chemical Engineering and Materials Science, Soochow University, Suzhou, Jiangsu, 215123, China.

Small (Weinheim an der Bergstrasse, Germany)
|August 3, 2023
PubMed
概括

二维 (2D) (Ir) 催化剂在质子交换膜 (PEM) 水电解剂中促进酸氧演化反应 (OER) 的前景有望. 这些先进的2D Ir材料为高效的生产提供了增强的活性和稳定性.

关键词:
两维材料是二维材料.基于Ir的催化剂.酸性介质是一种酸性介质.氧气演变反应 (OER) 是一种氧气演变反应.

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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:

  • 酸性水的分裂对于生产至关重要,但受到质子交换膜 (PEM) 电解器中氧化演化反应 (OER) 的限制.
  • 基于 (Ir) 的材料是酸性OER的最先进的催化剂,提供良好的稳定性,但需要改进活动.
  • 二维 (2D) 材料具有诸如高表面积和先进电催化学的独特特性等优势.

研究的目的:

  • 审查2D催化剂在电催化中的优势.
  • 介绍基于2D Ir的材料的分类,合成和OER成果.
  • 讨论酸性OER中的2D Ir催化剂的未来前景和挑战.

主要方法:

  • 对用于电催化的二维材料的文献综述.
  • 基于2D Ir的材料 (金属,合金,氧化物,矿) 的分类和合成方法.
  • 对氧化演化反应 (OER) 性能最近取得的成就进行分析.

主要成果:

  • 2D材料具有较大的表面积,独特的电气性能,并且易于修改以提高催化性能.
  • 各种基于2D Ir的材料,包括纯金属,合金,氧化物和矿,已被合成和研究用于OER.
  • 通过2D材料设计,在改善基于Ir的催化剂的活性和稳定性方面取得了显著进展.

结论:

  • 基于2D Ir的材料对于开发酸氧演化反应 (OER) 的高效和稳定的催化剂具有高度吸引力.
  • 进一步研究2D Ir材料的合成和应用对于推进质子交换膜 (PEM) 水电解剂至关重要.
  • 克服当前的挑战将为通过电化学水分的实际生产铺平道路.