トングステン・ナトリド媒介の電子調節により,Ptの優れた酸化水素とCO中毒抵抗を解き放つ
1Key Laboratory of Functional Inorganic Materials Chemistry, Ministry of Education of the People's Republic of China, Heilongjiang University, Harbin 150080, China.
Journal of the American Chemical Society
|October 28, 2024
まとめ
トングステンニトリド (WN) は,陽子交換膜燃料電池のプラチナ (Pt) 触媒を強化し,水素酸化反応 (HOR) の活性とCO毒性耐性を高める. この新しいPt@WN/rGO触媒は優れた性能と耐久性を示しています.
科学分野:
- 電気化学
- 材料科学
- カタリシス
背景:
- 陽子交換膜燃料電池 (PEMFC) は,水素酸化反応 (HOR) のための効率的な触媒を必要とします.
- プラチナ (Pt) 基の触媒は,活性とCO中毒に対する耐性で課題に直面しています.
- 水素燃料に含まれるCOの不純物はPt触媒を無効にすることができます.
研究 の 目的:
- Pt電子構造のモジュレーターとしてのボルンガムニトリド (WN) を調査する.
- 高活性でCO耐性のPtベースのHORの触媒を開発する.
- Pt触媒に対するWNの作用のメカニズムを理解する.
主な方法:
- Ptに対するWNの影響を予測する理論的計算
- WN/減少グラフィット酸化物 (Pt@WN/rGO) を支持した最小Pt含有量の触媒の合成
- 電気化学試験 (HOR活性,CO剥離電圧測定) と オペランドシンクロトロン放射線分析.
主要な成果:
- WNは水素吸収を大幅に最適化し,PtのCO吸収を弱める.
- Pt@WN/rGO (1.4 wt% Pt) は,商用Pt/Cの11.8倍以上のHOR質量活性を示しています.
- 触媒は1000ppmのCOで98.2%の活性を維持し,特異的な毒性耐性を示しています.
結論:
- WNはPtの電子構造を効果的に調節し,HORの活性とCO耐性を高めます.
- WNとPtの相乗効果はHORを加速し,触媒の耐久性を改善する.
- 開発された触媒は,CO耐性PEMFCに対して有望である.
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