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関連する概念動画

Radical Oxidation of Allylic and Benzylic Alcohols01:21

Radical Oxidation of Allylic and Benzylic Alcohols

2.0K
Activated manganese(IV) oxide can selectively oxidize allylic and benzylic alcohols via a radical intermediate mechanism. Primary allylic alcohols are oxidized to aldehydes, while secondary allylic alcohols yield ketones. The redox reaction of potassium permanganate with an Mn(II) salt such as manganese sulfate (under either alkaline or acidic conditions), followed by thorough drying, yields the oxidizing agent: activated MnO2. While MnO2 is insoluble in the solvents used for the reaction, the...
2.0K
Redox Titration: Other Oxidizing and Reducing Agents01:26

Redox Titration: Other Oxidizing and Reducing Agents

278
Besides iodine, other oxidizing or reducing agents can serve as titrants in redox titrations. Common oxidizing titrants include KMnO4, cerium(IV), and K2Cr2O7. The choice of oxidizing titrants depends on factors like stability, cost, analyte strength, and reaction rate between the analyte and titrant. KMnO4 is a strong oxidizing titrant that reduces from Mn(VII) to Mn(II) in a highly acidic solution, simultaneously oxidizing the analyte to a higher oxidation state. In this case, KMnO4 acts as a...
278
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

10.1K
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.
10.1K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

11.4K
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.
11.4K

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Updated: Jun 26, 2025

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酸素進化の催化のために,MnO2から原子的に分散した六価イリジウム酸化物

Ailong Li1, Shuang Kong1, Kiyohiro Adachi2

  • 1Biofunctional Catalyst Research Team, RIKEN Center for Sustainable Resource Science (CSRS), 2-1 Hirosawa, Wako, Saitama 351-0198, Japan.

Science (New York, N.Y.)
|May 9, 2024
PubMed
まとめ

原子的に分散した六価イリジウム (IrVI) オキシドは,陽子交換膜水電解のために合成された. この新しいIrVIを吸収した材料は,優れた活性と安定性を発揮し,基準のイリジウム酸化物を上回ります.

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Last Updated: Jun 26, 2025

Photochemical Oxidative Growth of Iridium Oxide Nanoparticles on CdSe@CdS Nanorods
05:41

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科学分野:

  • 電気化学
  • 材料科学
  • カタリシス

背景:

  • イリジウム酸化物は,酸性環境における酸素進化反応 (OER) に不可欠である.
  • 六価イリジウム (IrVI) オキシドは,理論的には,OERの活性と安定性を向上させることを約束している.
  • オキシドの実験合成は依然として大きな課題である.

研究 の 目的:

  • 原子的に分散したIrVI酸化物 (IrVI-ado) を合成し,特徴づけること.
  • 陽子交換膜 (PEM) の水電解におけるアノド材料としてのIrVI-adoの性能を評価する.
  • 動作条件下におけるIrVI-adoの安定性と耐久性を調査する.

主な方法:

  • カリウム六塩化物 (IV) の酸化リガンド置換によるIrVI-adoの合成.
  • 先進的なスペクトルおよび顕微鏡技術を用いた特徴付け.
  • 地上X線分析によるPEM水電解装置での電気化学試験.

主要な成果:

  • 1.7 × 10 5 A/gの質量特異活性を達成し,基準のイリジウム酸化物より大幅に高い.
  • 1.5 × 108という高い売上高を示した.
  • PEM操作中のインサイトX線分析により,電流密度2.3A/cm2までのIrVI-adoの耐久性が確認されました.

結論:

  • 原子的に分散したIrVI酸化物 (IrVI-ado) が成功して合成され,特徴づけられた.
  • IrVI-adoは,PEM水電解における酸素進化反応の例外的な活性と安定性を表している.
  • この材料は,効率的で耐久的な水分裂のための次世代のアノドとして,大きな希望を持っています.