塩基媒介における水素酸化反応の優れた性能に向けた3nm以下のPt@Ru
Fei Yang1,2,3, Yian Wang2, Yingdan Cui2
1Eastern Institute for Advanced Study, Eastern Institute of Technology, Ningbo 315200, Zhejiang, China.
Journal of the American Chemical Society
|December 6, 2023
まとめ
研究者らは,シンプルな浸潤法を使用して,3nm以下のPt@Ruコアシェルナノ粒子を開発した. これらの高度な電気触媒は,アニオン交換膜燃料電池 (AEMFC) の水素酸化反応運動を大幅に高めます.
科学分野:
- 材料科学
- 電気化学
- ナノテクノロジー
背景:
- アニオン交換膜燃料電池 (AEMFC) は水素変換に有望であるが,アルカリ的環境における水素酸化反応の速度が遅いため,課題に直面している.
- 効率的な電気触媒の開発は,AEMFC技術の進歩に不可欠です.
研究 の 目的:
- 高活性で安定した3nm以下のPt@Ruコアシェルナノ粒子を合成する.
- AEMFCにおける水素酸化反応の運動性を改善する.
- 先進的なナノ触媒の 簡単な合成方法を示すために
主な方法:
- プラチナ (Pt) とルテニウム (Ru) を異なる冷却温度で連続的に減少させ,Pt@Ruコアシェルナノ粒子を生成するために単純な浸漬プロセスを利用しました.
- 合成されたナノ粒子のサイズ,構造,および電気化学的表面積 (ECSA) を特徴付けました.
- 回転円盤電極 (RDE) 測定と膜電極組立 (MEA) 試験を用いた電触媒性能の評価
主要な成果:
- 合成された超小型のPt@Ruコアシェルナノ粒子は,平均サイズは ~2.5 nm,高 ECSA は 166.66 m2 gPt+Ru-1である.
- 交換電流密度 (j0) は,商用Pt/Cの8.0倍と5.8倍で,質量標準化されたj0は,これまでに報告されている最高です.
- MEA試験でピーク電力密度1.78W cm-2を証明し,商用PtRu/Cを上回っている.
結論:
- 単純な浸漬方法は,細かいPt@Ruコアシェルナノ触媒を合成するのに有効です.
- 強化された活動は,RuからPtへの電子移転と超細粒子のサイズに起因する.
- この研究は,AEMFCの性能と原子構造制御の重要性を改善するためのコアシェルナノ構造の可能性を強調しています.
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