アルカリ水素酸化のための高効率でCO耐性な触媒としてルイナノ粒子を搭載したV-O種のドーピングされた炭素フレームワーク
Pengcheng Wang1, Yang Yang1, Wei Zheng1
1Hefei National Research Center for Physical Sciences at the Microscale and Department of Materials Science and Engineering, University of Science and Technology of China, Hefei 230026, China.
Journal of the American Chemical Society
|December 11, 2023
まとめ
研究者は,アニオン交換膜燃料電池のための新しいルテニウム触媒 (Ru/VOC) を開発した. この触媒は水素酸化反応とCO耐性を大幅に改善し,より効率的な燃料電池技術への道を開く.
科学分野:
- カタリシス
- 電気化学
- 材料科学
背景:
- アニオン交換膜燃料電池 (AEMFC) は,アルカリ水素酸化 (HOR) のための効率的でCO耐性のある触媒を必要とします.
- ルテニウムベースの触媒は有望ですが,活動と安定性には多くの課題があります.
研究 の 目的:
- AEMFCにおけるアルカリ性HORのための新しい,高度に活性でCO耐性のルテニウム触媒を開発する.
- 触媒性能の強化のメカニズムを解明する.
主な方法:
- 原子的に分散したV-O種 (Ru/VOC) を含む炭素フレームワーク上の超小型のRuナノ粒子の合成
- アルカリのHOR性能とCO耐性に対するRu/VOCの電気化学試験
- 触媒メカニズムを理解するための密度関数理論 (DFT) の計算.
主要な成果:
- Ru/VOCは,Ru/Cの31.3倍,Pt/Cの4.7倍以上の質量活性を示した.
- Ru/CおよびPt/Cアノドよりも高いピーク電力密度1.194Wcm−2を達成した.
- 卓越した安定性と CO耐性を証明した.
- DFT計算では,V-O種が最適のOH−吸収部位であり,Ru活性とCO耐性を高めることが明らかになった.
結論:
- 炭素のフレームワークに原子的に分散したV-O種は,アルカリのHORを刺激する効果的なOH−吸収部として作用する.
- Ruから炭素基板への電子転送は,H2とCOの結合エネルギーを減少させ,Ruの電子構造を最適化します.
- この研究は,アルカリ性HORのための高性能触媒の設計のための新しい戦略を提供します.
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