効率的なエレクトロカタリシスのためのマクロ/微孔共性有機フレームワーク
Xiaojia Zhao1, Pradip Pachfule1, Shuang Li1
1Department of Chemistry, Division of Functional Materials , Technische Universität Berlin , Hardenbergstraße 40 , 10623 Berlin , Germany.
Journal of the American Chemical Society
|March 28, 2019
まとめ
階層的なマクロ-微孔構造を持つ結晶的共性有機フレームワーク (COF) を作成する簡単な戦略を開発しました. これらの新しいCOFは,質量輸送の改善とアクセシブルな活性部位による強化された酸素進化反応 (OER) 活性を示しています.
科学分野:
- 材料科学
- ナノテクノロジー
- カタリシス
背景:
- 結合有機フレームワーク (COF) は,堅固な構造,低密度,そして多様な用途のための高表面積を提供します.
- 通常,COFは微孔性を持ち,特定の用途での質量輸送を制限します.
- マイクロとマクロポールを組み合わせた階層的な孔構造は,質量輸送の強化に最適です.
研究 の 目的:
- 固有の微孔性および調整可能なマクロ孔性を持つ結晶COFを製造するための簡単な戦略を開発する.
- 相互接続されたマクロ-マイクロポラス構造を持つβ-ケトエンアミンベースのCOFを合成し,特徴づけること.
- 酸素進化反応 (OER) のための金属調整ヒエラルキカルCOFの触媒活性を調査する.
主な方法:
- テンプレート誘導法を用いた結晶COFの製造により,階層的な孔構造が生成される.
- 金属の調整のためのCOFのバックボーンにビピリジン分子を組み込む.
- マクロ-TpBpy-Coの合成は,階層的な孔構造内のCo2+を調整することによって行われます.
主要な成果:
- 相互接続されたマクロ-マイクロポラス構造を持つ様々なβ-ケトエンアミンのCOFを成功裏に合成した.
- 合成されたマクロポラスCOFは高結晶性と高特異表面積を維持した.
- 生成されたマクロTpBpy-Coは,純粋に微孔性COFと比較して,OER活性 (380 mV 10 mA/cm2) が著しく改善された.
結論:
- 開発されたファッセル戦略は,調整可能な階層的な孔構造を持つ結晶型COFの製造を可能にします.
- COFの階層的な多孔性は,触媒の用途に不可欠な質量輸送特性を高める.
- マクロTpBpy-Co触媒はOERの高い活性を示しており,これは大量拡散とアクセシブルなアクティブサイトに起因する.
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