Fe-V原子ペア触媒による急性生成を回避し,強固な酸素還元および亜鉛空気電池
Lan Ran1, Yichen Zhang2, Wenming Tong3
1College of Chemistry and Chemical Engineering, Central South University, Changsha, 410083, China.
Angewandte Chemie (International ed. in English)
|September 4, 2025
まとめ
新しい鉄・ヴァナジウム・炭素触媒 (Fe-V-NC) は,酸素還元反応 (ORR) 中の活性酸素種 (ROS) の損傷を回避し,クリーンエネルギーアプリケーションの触媒活性と安定性を大幅に高めます.
科学分野:
- 材料科学
- 電気化学
- カタリシス
背景:
- 鉄-窒素-炭素 (Fe-N-C) 触媒は,酸素還元反応 (ORR) のプラチナフリー代替品として有望である.
- しかし,ORRメカニズムで生成される反応性酸素種 (ROS) はFe-N-Cの活性と安定性を低下させる.
研究 の 目的:
- ROS生成を回避し,Fe-N-C触媒の性能を改善するための戦略を開発する.
- 強化されたORR活動と安定性のためにFe-V原子ペア触媒 (Fe1V1-NC) を設計し合成する.
主な方法:
- 密度関数理論 (DFT) による触媒設計
- 特定のN2Fe-N2-VN2構成を持つFe-V原子ペア触媒の合成
- ORR活性と0.1MKOHにおける安定性の電気化学的特徴
主要な成果:
- Fe1V1-NC触媒は,ROSの形成を避けるため,サイドオンO2吸収と直接OO結合の断絶を可能にします.
- Fe1V1-NCは高ORR発現ポテンシャル (1.02V) と半波ポテンシャル (0.89V対RHE) を表している.
- 特殊な安定性は,Fe-N-Cを上回る50,000サイクルでの最小の潜在的衰退 (16mV) を実証した.
- Fe1V1-NCベースの亜鉛空気電池は400時間までの優れた耐久性を示しています.
結論:
- 経路切り替え戦略は,ROS生成を効果的に抑制し,ORRパフォーマンスを向上させます.
- Fe-V原子ペア触媒は,高度に活性で安定したORR電触媒への実行可能な経路を提供します.
- この研究は,エネルギー変換のための耐久性の高い触媒システムの開発を進めています.
関連する概念動画
Radical Reactivity: Overview
2.2K
Radicals, the highly reactive species, gain stability by undergoing three different reactions. The first reaction involves a radical-radical coupling, in which a radical combines with another radical, forming a spin‐paired molecule. The second reaction is between a radical and a spin‐paired molecule, generating a new radical and a new spin‐paired molecule. The third reaction is radical decomposition in a unimolecular reaction, forming a new radical and a spin‐paired...
2.2K
Voltaic/Galvanic Cells
58.4K
Spontaneous Chemical Reactions
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
Spontaneous redox reactions occur abundantly in nature. The chemical reaction occurring in a disposable AA battery powering our remote controls is one such example of a spontaneous redox reaction. Another example is the immersion of coiled copper wire into an aqueous silver nitrate solution. The reaction shows a gradual, visually impressive color change from colorless to bright blue and the formation of a grey precipitate on the copper wire. In this experiment,...
58.4K
Radical Autoxidation
2.2K
The oxidation of an organic compound in the presence of air or oxygen is called autoxidation. For example, cumene reacts with oxygen to form hydroperoxide. Autoxidation involves initiation, propagation, and termination steps. Many organic compounds are susceptible to autoxidation—especially ethers in the presence of oxygen, which form hydroperoxides. Even though this reaction is slow, old ether bottles contain small amounts of peroxide, which leads to laboratory explosions during ether...
2.2K
Radical Formation: Addition
1.8K
Radicals can be formed by adding a radical to a spin-paired molecule. This is typically observed with unsaturated species, where the addition of a radical across the π bond leads to the production of a new radical by dissolving the π bond. For example, the addition of a Br radical to an alkene yields a carbon-centered radical.
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
Similar to charge conservation in chemical reactions, spin conservation is implicit for radical reactions. Accordingly, the product formed must possess an...
1.8K
Radical Formation: Elimination
1.9K
Another method of radical formation is the elimination process. It is the opposite of the addition route and is driven by the instability of the radical. For example, as depicted in Figure 1, dibenzoyl peroxide yields a pair of unstable radicals upon homolysis. Given its instability, this radical spontaneously undergoes elimination via a C–C bond cleavage to form a relatively more stable phenyl radical. The mechanism involves cleavage of the bond between the α and β positions...
1.9K
Batteries and Fuel Cells
28.0K
A battery is a galvanic cell that is used as a source of electrical power for specific applications. Modern batteries exist in a multitude of forms to accommodate various applications, from tiny button batteries such as those that power wristwatches to the very large batteries used to supply backup energy to municipal power grids. Some batteries are designed for single-use applications and cannot be recharged (primary cells), while others are based on conveniently reversible cell reactions that...
28.0K


