Pt-Ruナノ結晶の形状制御:強化された電解メタノール酸化のためのチューニング表面構造
Liang Huang1,2, Xueping Zhang1,3, Qingqing Wang1
1State Key Laboratory of Electroanalytical Chemistry, Changchun Institute of Applied Chemistry, Chinese Academy of Science , Changchun, Jilin 130022, P. R. China.
Journal of the American Chemical Society
|December 29, 2017
まとめ
プラチナ・ルテニウム (PtRu) 合金ナノ粒子は,メタノールの酸化反応に希望を示しています. この研究では,PtRu {111} 面は,燃料電池触媒設計の洞察を提供する {100} 面と比較して優れた活性と安定性を示しています.
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・ルテニウム (PtRu) 合金ナノ粒子は,メタノール酸化反応 (MOR) で高い電解活性とCO中毒耐性を有することが知られている.
- PtRuナノ粒子の側面依存性特性を理解することは,触媒の性能を最適化するために不可欠ですが,合成の難しさのために困難です.
研究 の 目的:
- 調節可能な側面を持つよく定義されたPtRuナノ結晶のための一般的な合成方法を開発する.
- 表面活性剤の構造指向効果とPtRuナノ結晶の形成機構を調査する.
- MORのためのPtRuナノ結晶の面依存の電気触媒性能を体系的に評価する.
主な方法:
- 制御された形状 (ナノワイヤ,ナノロッド,ナノキューブ) の超薄のPtRuナノ結晶の1段階の溶熱合成.
- 形成メカニズムを理解するために,様々な表面活性物質を使用し,制御実験と時間依存の研究を行う.
- MORのモデル触媒として,PtRuナノ結晶の{100}と{111}の電気化学的評価.
主要な成果:
- 調節可能な形状と制御された側面 ({100} と {111}) を有するPtRuナノ結晶を成功裏に合成した.
- {111} 末端のPtRuナノワイヤは,{100} 末端のPtRuナノキューブと商用Pt/Cと比較して,MORの安定性 (2. 28倍) と電解質量活性 (4. 32倍) が著しく高かった.
- PtRu {111} 面は,メタノールの酸化活動と,{100} 面よりも高いCO中毒抵抗性を表しています.
結論:
- PtRu {111} ファセットは,{100} ファセットと比較してメタノールの酸化反応に優れている電気触媒特性を持っています.
- 開発された合成方法は,明確に定義されたPtRuナノ結晶を提供し,基本的な燃料電池研究のための理想的なモデル電気触媒として機能します.
- この研究は,エネルギー用途のPtRu合金における面依存触媒の理解を進める.
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