超薄型イコサヘドラルPt濃縮ナノケージ 優れた酸素還元反応活性
Dong Sheng He1, Daping He1, Jing Wang1
1Center of Advanced Nanocatalysis, University of Science and Technology of China , Hefei, Anhui 230026, China.
Journal of the American Chemical Society
|January 26, 2016
まとめ
酸素還元反応 (ORR) の活性を増強するために,超薄のイコサヘドラルプラチナ (Pt) ナノケージを合成した. この新しい触媒は燃料電池の性能を大幅に向上させ,商用触媒の費用対効果の高い代替品を提供します.
科学分野:
- 材料科学
- 電気化学
- ナノテクノロジー
背景:
- プラチナ (Pt) の費用対効果の高い利用は,陽子交換膜燃料電池の工業的な応用にとって極めて重要です.
- 空洞のナノ構造は,酸素還元反応 (ORR) のための電解性能とPt利用を高めることができます.
研究 の 目的:
- 超薄型イコサヘデラルのPt濃縮ナノケージを合成するためのルーチンを開発する.
- これらのナノケージのORR活動を評価し,既存の触媒や構造と比較する.
主な方法:
- パラジウム (Pd) のイコサヘドラルシードにPt原子の適合性沈殿.
- 濃縮された窒素酸 (HNO3) 溶液を使用してPdコアを選択的に除去し,ナノケージを形成します.
- 厚さ,欠陥,表面積,面向を含むナノケージの特性.
主要な成果:
- 超薄でイコアヘドラルな Pt濃縮ナノケージを 合成しました
- 表面と体積の比率が非常に高く, 偏りのあるPt{111}面がある.
- 商用Pt/Cと比較してORRの特異活性が10倍,質量活性が7倍高いことが示された.
- ORR活動で立方体と八面体ナノケージを上回る 構造上の優位性を強調します
結論:
- Ptで濃縮されたicosahedralナノケージは,酸素還元反応のための非常に効率的な触媒を表します.
- イコサヘドラルな形状と超薄な性質を含むユニークな構造特性は,触媒性能を大幅に向上させます.
- この開発は,燃料電池技術のコスト効率的なプラチナ利用のための有望な経路を提供します.
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