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関連する概念動画

Heterogeneous Catalysis01:22

Heterogeneous Catalysis

80
Heterogeneous catalysis involves a catalyst in a different phase from the reactants. It is a process where the catalyst and the reactants are in distinct phases, typically solid and gas or liquid.Most heterogeneous catalysts are metals, metal oxides, or acids. The list includes transition metals like iron (Fe), cobalt (Co), nickel (Ni), palladium (Pd), platinum (Pt), chromium (Cr), manganese (Mn), tungsten (W), silver (Ag), and copper (Cu). These metals possess partially vacant d orbitals that...
80
Catalysis02:50

Catalysis

32.1K
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.
32.1K
Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide02:44

Oxidation of Alkenes: Syn Dihydroxylation with Osmium Tetraoxide

13.3K
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.
13.3K
Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate02:21

Oxidation of Alkenes: Syn Dihydroxylation with Potassium Permanganate

17.9K
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.
17.9K
Oxidative Cleavage of Alkenes: Ozonolysis01:46

Oxidative Cleavage of Alkenes: Ozonolysis

13.5K
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.
13.5K
Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Updated: Mar 23, 2026

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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均質に分散した多金属酸素進化触媒

Bo Zhang1, Xueli Zheng2, Oleksandr Voznyy3

  • 1Department of Electrical and Computer Engineering, University of Toronto, 35 St George Street, Toronto, Ontario M5S 1A4, Canada. Department of Physics, East China University of Science and Technology, 130 Meilong Road, Shanghai 200237, China.

Science (New York, N.Y.)
|March 26, 2016
PubMed
まとめ

酸素進化反応 (OER) のための新しい土壌豊富な触媒は,記録的に低い過剰ポテンシャルを示しています. ゲル化された鉄コバルト・タングステンの酸化水素は,OERの用途において性能と安定性を向上させる.

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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:

  • 酸素進化反応 (OER) の第一列の移行金属触媒は,高超電位を必要とします.
  • トングステンは3D金属酸化物を調節し,OERの中間吸収を改善することができます.
  • 効率的で安定したOER触媒の開発は,エネルギーアプリケーションにとって極めて重要です.

研究 の 目的:

  • 効率的なOERのための地球豊富な触媒を開発する.
  • OERの性能の向上における非3D金属の役割を調査する.
  • OER触媒の低過剰電位と高い安定性を達成する.

主な方法:

  • 均質な金属分布を持つゲル化オキシヒドロキスの室温合成
  • FeCoW オキシヒドロキシドのOER性能に対する電気化学的試験
  • 触媒メカニズムの解明のためのX線吸収と計算研究.

主要な成果:

  • ゲル化FeCoWオキシヒドロキシドは,アルカリの電解質で報告された最も低い超電位 (191 mV at 10 mA/cm2) を達成した.
  • 触媒は優れた安定性を示し,500時間の稼働後に分解されませんでした.
  • W,Fe,Coの間の連携効果は,OERの有利な調整と電子構造を生み出します.

結論:

  • 原子的に均質なFeCoWオキシヒドロキシドは高効率で安定したOER触媒である.
  • トングステンは3D過渡金属酸化物のOER活性強化に重要な役割を果たしています.
  • 開発された触媒は,持続可能なエネルギー技術のためのOER触媒の重要な進歩を表しています.