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Synthesis and Characterization of Functionalized Metal-organic Frameworks
Published on: September 5, 2014
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メタル・オーガニック・フレーム内の小プラチナ・クラスターの生成と安定化
Kathrin Kratzl1, Tim Kratky1, Sebastian Günther1
1Catalysis Research Center , Technical University of Munich , Garching 85748 , Germany.
Journal of the American Chemical Society
|August 11, 2019
まとめ
この研究は,金属-有機フレームワークを使用して小さなプラチナナノクラスター (PtNC) を安定させるための新しい方法を示しています. その結果得られるPtNCs@ZIF-8複合材料は安定し,特に酸素還元反応に適しています.
科学分野:
- 材料科学
- ナノテクノロジー
- カタリシス
背景:
- リンガンドフリープラチナナノクラスター (PtNC) は触媒に不可欠ですが,安定させるのは難しいです.
- 原子精度の高いクラスターは 独特の特性を持ちますが 保護用マトリックスが必要です
研究 の 目的:
- リガンドフリーで小さなプラチナナノクラスター (PtNC) を生成し安定させる方法を開発する.
- これらのPtNCを保存し,処理するための複合材料を作成します.
- 誘導されたPtNCの電気触媒の応用の可能性を評価する.
主な方法:
- ゼオリスイイミダゾラートフレームワークZIF-8内のプラチナチニ群の封じ込め.
- PtNCs@ZIF-8複合物を得るための熱分解.
- UV/vis,IRスペクトル,HR-TEM,HAADF-STEM,XPS,PXRDを用いた特徴づけ
- ZIF-8マトリクスの酸性除去と炭素基板への転送
主要な成果:
- 制御されたPt負荷 (1-20 wt%) を有するZIF-8内の空気安定のPt12±ナノクラスタの合成に成功した.
- PtNCは高温解熱と触媒水素化でサイズを維持した.
- 派生したPtナノ粒子 (1.14 ± 0.35 nm) は酸素還元反応 (ORR) で高い性能を示した.
結論:
- メタル・オーガニック・フレームワーク・テンプレートアプローチは 小型のプラチナナノクラスタを効果的に安定させます
- PtNCs@ZIF-8複合体は,PtNCの貯蔵と処理のための汎用的なプラットフォームとして機能します.
- 誘導されたナノ粒子は 効率的な電気触媒による酸素還元に 期待されています
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