H2で CO を優先的に酸化するために Pt に固定された原子的に分散した鉄酸化物
Lina Cao1,2, Wei Liu3, Qiquan Luo1,2
1Hefei National Laboratory for Physical Sciences at the Microscale, University of Science and Technology of China, Hefei, China.
Nature
|February 1, 2019
まとめ
プラチナナノ粒子の上で原子的に分散した鉄酸化物は,水素燃料から一酸化炭素 (CO) の不純物を除去するための新しい解決策を提供します. この画期的な触媒は 広範囲の温度で効率的に動作し 陽子交換膜燃料電池の性能を向上させます
科学分野:
- カタリシス
- 材料科学
- 電気化学
背景:
- 陽子交換膜燃料電池 (PEMFC) はクリーンエネルギーの用途に有望である.
- 水素燃料中の一酸化炭素による触媒毒は,PEMFCの効率を阻害する.
- COの優先酸化 (PROX) を通して水素を浄化することが重要な課題です.
研究 の 目的:
- 水素中のCO除去のための高度に活性で選択的な触媒を開発する.
- 効率的なCO酸化を広範囲の温度で実現する.
- 燃料電池技術における触媒毒性の問題に対処するためです
主な方法:
- シリカを支えるプラチナ (Pt) ナノ粒子の上に原子的に分散した鉄酸化物の選択的堆積.
- X線吸収微細構造 (XAFS) のインサイト測定
- 密度関数理論 (DFT) の計算
主要な成果:
- 198〜380Kの温度範囲でPROXで完全で100%選択的なCO除去を達成しました.
- 従来のPt/鉄酸化物触媒の30倍以上の質量特異活性を示した.
- Ptナノ粒子にアクティブなインターフェイスサイトとして固定されたFe1 ((OH) xクラスターを特定した.
結論:
- Ptナノ粒子に原子的に分散した鉄酸化物は,高度に活性な触媒の新種を表しています.
- 隔離された移行金属複合体は,触媒設計のための革新的な戦略を提供します.
- このアプローチは,PEMFCの性能と耐久性を改善するためにCO浄化を強化します.
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