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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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Thermal and Photochemical Electrocyclic Reactions: Overview01:26

Thermal and Photochemical Electrocyclic Reactions: Overview

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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.
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Redox Equilibria: Overview01:23

Redox Equilibria: Overview

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A reduction-oxidation reaction is commonly called a redox reaction. In a redox reaction, electrons are transferred from one species to another rather than being shared between or among atoms. The reducing agent or reductant is the species that loses electrons and gets oxidized in the process. The species that gains electrons and gets reduced in the process is the oxidizing agent or oxidant. Redox reactions are represented as two separate equations called half-reactions, where one equation...
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Oxidation-Reduction Reactions03:11

Oxidation-Reduction Reactions

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Oxidation–Reduction Reactions
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Oxidation and Reduction of Organic Molecules01:19

Oxidation and Reduction of Organic Molecules

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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...
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Reduction of Alkenes: Asymmetric Catalytic Hydrogenation02:17

Reduction of Alkenes: Asymmetric Catalytic Hydrogenation

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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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原子触媒における可逆的適応構成は,効率的な酸素電還元を可能にします.

Hui-Ying Tan1, Sheng-Chih Lin1, Jiali Wang1

  • 1Department of Chemistry and Center for Emerging Materials and Advanced Devices, National Taiwan University, Taipei 10617, Taiwan.

Journal of the American Chemical Society
|December 1, 2023
PubMed
まとめ

g-C3N4に逆転可能なCu-N構成を持つ単原子触媒 (SAC) は,優れた酸素還元反応 (ORR) 活性を示している. ZIFから派生したSACの不可逆的な変化は,そのORRのパフォーマンスを妨げます.

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科学分野:

  • 電気化学
  • 材料科学
  • カタリシス

背景:

  • M-N-C部分を持つ単原子触媒 (SAC) は,酸素還元反応 (ORR) に有望である.
  • 適用されたポテンシャル下でのSACのダイナミックなM-N構成は十分に理解されていません.
  • マイクロ構造インターフェース (MSI) は,SACの安定性と性能において重要な役割を果たします.

研究 の 目的:

  • ORR条件下でg-C3N4とゼオリティイイミダゾラートフレームワーク (ZIF) の基板上の銅 (Cu) SACのダイナミック構成を調査する.
  • Cu SAC の構造的動態と ORR の活動に対する基板由来マイクロ構造的インターフェースの影響を明らかにする.
  • 原子電触媒の潜在力駆動特性についての洞察を提供するためです.

主な方法:

  • オペランド時間解像度X線吸収光譜 (TR-XAS)
  • ラマン光譜を操作する
  • 電気化学測定 (ORR)

主要な成果:

  • g-C3N4のCu SACは,逆転可能なCu-N構成を示し,優れたORR活性をもたらします.
  • ZIFから派生したCu SACは,不可逆的な構造変化と不安定なCu-Nボンドを示し,ORRのパフォーマンスを低下させます.
  • Operando TR- XASとRamanは,g- C3N4サポートされたSACにおけるCu- N構成の可逆的適応を確認した.

結論:

  • ダイナミックなM-N構成は,SACのORR性能にとって極めて重要です.
  • Cu-N構成の可逆的な適応は,高いORR活動のための鍵です.
  • この研究は,高度な原子電触媒の理解と設計のための体系的なアプローチを提供します.