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関連する概念動画

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
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

10.8K
Alkenes can be dihydroxylated using potassium permanganate.  The method encompasses the reaction of an alkene with a cold, dilute solution of potassium permanganate under basic conditions to form a cis-diol along with a brown precipitate of manganese dioxide.
10.8K
Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

6.1K
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...
6.1K
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
Radical Autoxidation01:20

Radical Autoxidation

2.1K
The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
2.1K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

9.8K
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.
9.8K

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Updated: May 28, 2025

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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熟成誘発の埋め込みによって形成された超安定した酸素進化電解剤

Wenjuan Shi1, Tonghao Shen2, Chengkun Xing1

  • 1State Key Laboratory of Molecular Engineering of Polymers, Department of Macromolecular Science, Fudan University, Shanghai, China.

Science (New York, N.Y.)
|February 13, 2025
PubMed
まとめ

新しい方法は,イリジウム触媒をセリウム酸化物に埋め込み,陽子交換膜水電解剤 (PEMWE) の安定性と効率を向上させます. 耐久性のある低負荷の酸素進化触媒で テラワット規模の水素生産をサポートします

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Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors
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Translating Extracellular Electron Transfer Activities with Organic Electrochemical Transistors

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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance

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関連する実験動画

Last Updated: May 28, 2025

Preparation of Polyoxometalate-based Photo-responsive Membranes for the Photo-activation of Manganese Oxide Catalysts
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科学分野:

  • 材料科学
  • 電気化学
  • カタリシス

背景:

  • 陽子交換膜水電解剤 (PEMWE) 技術は,テラワット規模の展開のために効率的で安定し,費用対効果の高い酸素進化触媒を必要とします.
  • イリジウム (Ir) 触媒は,活性であるが,溶解,再配置,分離,および集積により安定性が低下する.

研究 の 目的:

  • PEMWEにおける酸素進化反応のためのイリジウム触媒の安定化のための新しい戦略を開発する.
  • PEMWEの長期的な耐久性と効率を,触媒支援技術によって改善する.

主な方法:

  • イリジウム触媒ナノ粒子をセリウム酸化物支柱内に固定するために,熟成誘発の埋め込み戦略が採用された.
  • 合成メカニズムを分析するために,冷凍電子トモグラフィーと全原子運動モンテカルロシミュレーションが使用されました.
  • 加速老化試験 (6000時間) を実施し,触媒の安定性と性能を評価した.

主要な成果:

  • 埋め込み戦略は イリジウム種を安定させ 退廃を防ぎました
  • 合成した触媒は,高い性能 (1.72Vで3A/cm2) とともに,低いIr負荷 (0.3 mg/cm2) を達成した.
  • 特殊な長期安定性は,電圧の劣化率1. 33μV/hで実証された.

結論:

  • 有効な触媒の埋め込みには,超音波によるサポート成長とIr核化の同期が不可欠です.
  • 開発された組み込みのIr触媒は,将来のPEMWEシステムにおける安定的かつ効率的な酸素進化のための有望な解決策を提供します.
  • このアプローチは,大規模なグリーン水素生産に不可欠な費用対効果の高い耐久性のある触媒の道を開きます.