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PtCl6の単一の衝突を認識する
Jeffrey E Dick1, Allen J Bard1
1Center for Electrochemistry, Department of Chemistry, The University of Texas at Austin , Austin, Texas 78712, United States.
Journal of the American Chemical Society
|October 16, 2015
まとめ
研究者らは,超稀な溶液からプラチナのクラスタを電極化して,水素生成を示すユニークな電流のピークを観察しました. このピークは わずか5個のプラチナ原子が 形成されたときに発生し 非常に敏感な電気触媒検出を可能にします
科学分野:
- 電気化学
- 材料科学
- ナノテクノロジー
背景:
- 電気触媒は水素生産のようなエネルギー変換プロセスに不可欠です.
- ナノスケールでの電気触媒部位の検出と特徴付けは困難です
- プラチナ基の材料は,陽子還元などの反応のための非常に効果的な電気触媒です.
研究 の 目的:
- 超小型のプラチナの集積を電子化して検出する方法を開発する.
- 単一または数原子のプラチナのクラスターの電気触媒的活動を調査する.
- 陽子還元で触媒活動に必要な最小数のプラチナ原子を決定する.
主な方法:
- 炭素繊維の超微電子 (UME) にプラチナクラスターを電気化学的に堆積させる.
- 硫酸溶液でのアンペロメトリック電流時間 (i-t) 測定
- プラチナにプロトンの減少を好むように UME に適用された制御された電位.
- クラスター形成と活動を定量化するために,i-t応答の現在のスパイク (blips) の分析.
主要な成果:
- フェムトモラ・プラチナート溶液から触媒的に活性なプラチナクラスターを成功裏に放電した.
- プラチナのクラスターで陽子が水素に還元されるのに相当する明確な電流のピークの観測.
- 約5個のプラチナ原子で触媒活動が始まる.
- クラスターの急速な無効化 恐らく水素の泡の形成による
結論:
- フェムトモラ・プラチナート溶液は,高活性プラチナクラスタの電極化に使用できます.
- この研究は,電解性陽子還元のための最小数のプラチナ原子を定量化します.
- この方法は,電触媒の形成と機能の初期段階を研究するための敏感なアプローチを提供します.
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