Pd@Ptコア・シェル・コンカブ・デカエドラ:活性化と耐久性の高い酸素還元反応のための触媒のクラス
Xue Wang1,2, Madeline Vara3, Ming Luo1
1The Wallace H. Coulter Department of Biomedical Engineering, Georgia Institute of Technology and Emory University , Atlanta, Georgia 30332, United States.
Journal of the American Chemical Society
|November 14, 2015
まとめ
パラジアム・プラチナ (Pd@Pt) のコア・シェル・コンケーブ・デカエドルの 合成方法を開発しました これらの新しい触媒は,商用触媒と比較して,酸素還元反応 (ORR) の活性と耐久性が著しく向上しています.
科学分野:
- 材料科学
- ナノテクノロジー
- キャタリシス
背景:
- 効率的な電気触媒の開発はエネルギー変換技術にとって極めて重要です.
- パラジウム・プラチナ (Pd@Pt) のコア・シェルのナノ構造は,触媒化に有望である.
- ナノ粒子形態の制御は触媒性能に影響する.
研究 の 目的:
- 多重結合したPd@Ptコア・シェルの円十面体を合成する.
- Pt 堆積物に対するデカエドール種子形態の影響を調査する.
- 酸素還元反応 (ORR) のための合成されたPd@Pt円十面体の触媒活性と耐久性を評価する.
主な方法:
- Pd@Ptコア・シェル・コンケーブ・デカエドラの容易な合成は,Pdデカエドルのシードに制御されたPt沈殿による.
- デカエドール表面における原子堆積と拡散の特徴.
- サイクル電圧測定と加速耐久性試験を用いたORR活性と耐久性の電気触媒試験
主要な成果:
- Pd@Ptのコアシェルの円型デカエドルを合成し,Ptは好ましく高エネルギー部位 (頂点,エッジ/斜面) に堆積する.
- 商業用Pt/Cと比較して,コンカブデカエドルはORRの特異活性が4.4倍,質量活性が6.6倍増加した.
- 触媒は1万回の耐久性サイクルを経て,Pt/Cの2倍の質量活性を維持した.
結論:
- 制御された合成戦略は,ORRのために非常に活発で耐久性の高いPd@Pt円十面を生成します.
- 独特の状十面体形状とコアシェル構造は,触媒性能の向上に貢献しています.
- これらの発見は,先進的な電触媒を設計するための有望な経路を提供します.
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