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Oxidation-Reduction Reactions03:11

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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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Oxidation-reduction or redox reactions involve the transfer of electrons from one molecule or atom to another. When an atom gains an electron, another atom must lose an electron, meaning oxidation and reduction must occur together. Since the redox occurs in pairs, the atom that gets oxidized is also called the reducing agent or reductant, and the atom that is reduced is also called the oxidizing agent or oxidant. A straightforward way to remember the definitions of oxidation and reduction is...
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Redox reactions are vital biochemical processes that underpin energy metabolism in cells. These reactions involve the transfer of electrons between molecules, occurring in tandem as oxidation and reduction. Oxidation refers to the loss of electrons, while reduction denotes their gain. This coupling ensures the seamless flow of electrons through metabolic pathways. For example, in bacterial metabolism, glucose undergoes oxidation to carbon dioxide, while oxygen is simultaneously reduced to...
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Electrodeposition is a technique used to separate an analyte from interferents by electrochemical processes. Here, the analyte is a metal ion that can be deposited on an electrode immersed in the sample solution. The electrochemical setup consists of an anode and a cathode. When an electric current is applied to the setup, oxidation occurs at the anode. At the cathode, which consists of a large metal surface, metal ions undergo reduction and deposit onto the surface.
Electrodeposition can...
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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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Updated: Jan 3, 2026

Synthesis of Metal Nanoparticles Supported on Carbon Nanotube with Doped Co and N Atoms and its Catalytic Applications in Hydrogen Production
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コバルト基ナトリド・コア・オキシド・シェル・酸素還元電解剤

Yao Yang1, Rui Zeng1, Yin Xiong1

  • 1Department of Chemistry and Chemical Biology, Baker Laboratory , Cornell University , Ithaca , New York 14853 , United States.

Journal of the American Chemical Society
|November 20, 2019
PubMed
まとめ
この要約は機械生成です。

新しいコバルトニトリド触媒 (Co4N/C) は,燃料電池における酸素還元反応 (ORR) の高い性能を示している. これらの無価値の電触媒は プラチナに代わる安価で耐久性の高い燃料電池技術を 提供しています

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科学分野:

  • 材料科学
  • 電気化学
  • エネルギー変換

背景:

  • 酸素還元反応 (ORR) のための効率的で費用対効果の高い電気触媒の開発は,燃料電池技術の進歩に不可欠です.
  • 非貴金属電触媒は高価なプラチナベースの電触媒の代わりとして非常に求められています.

研究 の 目的:

  • アルカリ燃料電池におけるORRの潜在的電気触媒としてのコバルト窒化物 (CoN/C) の新しいファミリーを調査する.
  • 他のコバルトニトリドおよび商用触媒と比較して,ORRの活性,耐久性,および性能を評価する.

主な方法:

  • コバルトニトリド材料の合成と特徴付け (CoN/C,x=2,3,4).
  • 1MKOH溶液におけるORRの電気触媒の電気化学試験
  • コバルト酸化物とプラチナ触媒との比喩による耐久性評価

主要な成果:

  • Co4N/Cは,商用Pt/C (0. 89V) と比較できる0. 875Vの半波電位 (E1/2) で,最も高いORR活性を示した.
  • Co4N/Cは,Co3O4/Cよりも質量活動が8倍に改善され,10,000サイクル後に軽微な分解で例外的な安定性を示した.
  • この性能の向上は,導電性ナトリドコアと薄い,自然に形成された酸化物殻に起因する.

結論:

  • コバルト・ニトリド,特にCo4N/Cは,アルカリ燃料電池におけるORRのための有望な非貴重な電気触媒である.
  • 導電性ナイトリドコアとオキシード殻を組み合わせたユニークな構造は,触媒の活性と耐久性を高めます.
  • このアプローチは,燃料電池アプリケーションのための先進的な金属窒素電触媒の設計のための実行可能な戦略を提供します.