ORR火山のピークを2核の建設経由で登る:電子と幾何学工学
Meiling Xiao1, Yongting Chen2, Jianbing Zhu1
1State Key Laboratory of Electroanalytical Chemistry, Jilin Province Key Laboratory of Low Carbon Chemical Power , Changchun Institute of Applied Chemistry Chinese Academy of Sciences , Changchun 130022 , China.
Journal of the American Chemical Society
|October 12, 2019
まとめ
酸素還元反応 (ORR) のための新しいFe-Co二原子触媒を開発しました. この新しい触媒は,中間の脱吸収とO−O結合の分裂を最適化することで,単原子触媒の性能を大幅に向上させます.
科学分野:
- 電気化学
- 材料科学
- カタリシス
背景:
- M-NXセンターを持つ単原子触媒 (SAC) は,酸素還元反応 (ORR) の有望性を示しています.
- ORRのための現在のSACは,プラチナベースの触媒よりも低い性能を示します.
- 最適なエネルギーレベルとジオメトリにアクティブサイト構成を調整することは,SACを改善するために不可欠です.
研究 の 目的:
- ORR活性が強化された新しい二原子触媒を設計し合成する.
- ORR触媒における電子構造変化と調整幾何学の役割を調査する.
- ORR電解の二原子部位に関する基本的な洞察を提供すること.
主な方法:
- Fe-Co二原子中心のサイト (FeCoN5-OH) の構築.
- 電子を取り除くOHリガンドを組み込み,エネルギーレベルを修正し,中間脱吸収を促進します.
- 開始と半波のポテンシャルを含むORRパフォーマンスを評価するための電気化学的特徴付け.
主要な成果:
- FeCoN5-OHサイトは,それぞれ1. 02Vと0. 86V (対RHE) の開始および半波ポテンシャルで,優れたORR活性を示した.
- FeCoN5-サイトの固有活動は,単原子FeN4サイトの20倍以上でした.
- OHリガンドは電子構造を効果的に改変し,中間脱吸収とO−O結合分裂を促進した.
結論:
- ORRに合わせた電子構造を持つ二原子サイトを用いた新しい戦略が成功裏に開発されました.
- OHリガンドを持つFe-Co二原子サイトは,高性能ORR電触媒の設計に有望な経路を提供します.
- この研究は二重原子の位置に関する理解を深め,触媒設計の新たな道を開く.
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