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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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Turnover Number and Catalytic Efficiency01:19

Turnover Number and Catalytic Efficiency

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The turnover number of an enzyme is the maximum number of substrate molecules it can transform per unit time. Turnover numbers for most enzymes range from 1 to 1000 molecules per second. Catalase has the known highest turnover number, capable of converting up to 2.8×106 molecules of hydrogen peroxide into water and oxygen per second. Lysozyme has the lowest known turnover number of half a molecule per second.
Chymotrypsin is a pancreatic enzyme that breaks down proteins during digestion....
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Heterogeneous Catalysis01:22

Heterogeneous Catalysis

141
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...
141

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Synthesis of Platinum-nickel Nanowires and Optimization for Oxygen Reduction Performance
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リンを組み込むことでFe-N-C触媒の酸素電解活性を増大させる

Yazhou Zhou1,2, Ruihu Lu3, Xiafang Tao1,2

  • 1Max Planck Institute for Polymer Research, Mainz 55128, Germany.

Journal of the American Chemical Society
|February 6, 2023
PubMed
まとめ

鉄-窒素-炭素触媒にリンを組み込むことは,酸素進化反応の活性を著しく高めます. 効率的な二機能酸素電解を可能にすることで 再充電可能な亜鉛空気電池を改良します

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科学分野:

  • 電気化学
  • 材料科学
  • キャタリシス

背景:

  • 単原子鉄 (Fe-N-C) を含んだ窒素添加炭酸物質は,酸素還元反応 (ORR) の主要な触媒である.
  • これらのFe-N-C材料は,O-O結合が遅いため,酸素進化反応 (OER) の性能が悪く,充電可能な亜鉛空気電池での使用を制限しています.

研究 の 目的:

  • Fe-N-C触媒の酸素進化反応 (OER) の活性を増強する.
  • 再充電可能な亜鉛空気電池のための高度な二機能電気触媒を開発する.

主な方法:

  • 原子をFe-N-C触媒の第2の調整球に組み込み,P/Fe-N-C材料を生成する.
  • 電気化学的特徴は0.1M KOHで表される.
  • 最初の原理は密度関数理論による計算です.

主要な成果:

  • P/Fe-N-C素材は,10 mA cm−2で304 mVの低超電位で優れたOER活性を示した.
  • 酸素還元反応/酸素進化反応 (ORR/OER) のポテンシャルギャップが非常に小さい0. 63Vを達成した.
  • 理論的な計算では,フォスファルはFeN4の場所での*OOH/*O吸収をバランスさせ,触媒的活性を増大させることが示された.
  • 再充電可能なZn-空気電池のP/Fe-N-Cカトードは,269 mW cm−2の高いピーク電力密度を提供した.

結論:

  • を第2の調整領域に組み込むことは,Fe-N-C触媒におけるOER活動を促進する効果的な戦略です.
  • P/Fe-N-C素材は,充電可能な亜鉛空気電池のための最先端の二機能酸素電気触媒として有望です.