燃料電池における効率的な酸素還元反応のためのL10-FePtとPtナノ粒子におけるインターメタリックL10によるFe安定化
Junrui Li1, Zheng Xi1, Yung-Tin Pan2
1Department of Chemistry, Brown University , Providence, Rhode Island 02912, United States.
Journal of the American Chemical Society
|February 8, 2018
まとめ
L10-MPt合金ナノ粒子に 第一列の移行金属を安定させ プラチナ (Pt) 原子層で覆いました このコア/シェル構造は燃料電池の酸素還元反応 (ORR) の触媒を大幅に強化します.
科学分野:
- 材料科学
- 電気化学
- ナノテクノロジー
背景:
- 効率的な電気触媒の開発は 燃料電池の性能に不可欠です
- プラチナ基の触媒は酸素還元反応 (ORR) に不可欠である.
- プラチナナノ構造の中で移行金属を安定させると 触媒活性が向上します
研究 の 目的:
- L10-MPt合金ナノ粒子の第一列移行金属 (M) を安定させるため.
- 酸素還元反応 (ORR) のためのプラチナ (Pt) 触媒を強化する.
- 燃料電池用の効率的なORR触媒を開発する.
主な方法:
- L10-FePt/Ptナノ粒子を薄いPt殻で製造する.
- ナノ粒子の構造と組成の特徴
- 酸性介質と膜電極組 (MEA) でORRの活性と耐久性の電気触媒試験.
主要な成果:
- L10-FePtナノ粒子のFeを効果的に安定させたのは5 Å Ptシェルである.
- FeコアはPtシェルに圧縮ストレスを誘導し,ORR触媒を強化しました.
- L10-FePt/Pt触媒は,0.7A/mgPtの質量活動と優れた耐久性を達成し,DOE 2020の目標を達成しました.
- 同様の有望な結果はL10-CoPt/Ptナノ粒子でも観察されました.
結論:
- コア/シェルL10-MPt/Ptナノ粒子は,非常に効果的なORR電触媒である.
- この戦略は,Pt負荷を削減し,燃料電池の効率を向上させるための道を示しています.
- 開発された触媒は自動車燃料電池の応用の可能性を示しています.
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