三角三核金属-N4複合体は,酸素還元のための高い電解活性を持つ.
Ruili Liu1, Christian von Malotki, Lena Arnold
1Max-Planck-Institut für Polymerforschung, Ackermannweg 10, 55128 Mainz, Germany.
Journal of the American Chemical Society
|June 16, 2011
まとめ
コバルトと鉄を含む新しい三角形のマクロサイクル金属複合体は,酸素還元反応において高い活性を示している. これらの非貴金属触媒は,燃料電池のプラチナの有望な代替品を提供します.
科学分野:
- 電気化学 電気化学について
- マテリアルサイエンス 材料科学
- カタリシス カタリシス カタリシス
背景:
- 酸素還元反応 (ORR) は燃料電池の性能にとって極めて重要です.
- 効率的で安定した非貴金属触媒 (NPMC) の開発は,重要な課題です.
- 既存の触媒は,活動,安定性,またはコストの制限にしばしば直面する.
研究 の 目的:
- マクロサイクルメタル-N(4) 複合体の新種を設計・合成する.
- ORRのための構造的性質と触媒的活動を調査する.
- 燃料電池アプリケーションのNPMCとしての潜在能力を評価する.
主な方法:
- 三角形のマクロサイクリック金属-N(4) 複合体の合成 ([MN(4) ](n),M = Co,Fe).
- 合成された複合体の構造的特徴.
- 塩基性環境におけるORRの触媒活性と安定性の電気化学的評価.
主要な成果:
- アクティブサイトの密度が高いユニークな三角三核構造が達成されました.
- [CoN(4) ](3) / C触媒は,ORRに対する高い触媒活性を示した.
- コバルト基の触媒は,商用Pt/Cと比較して優れた長期安定性を示した.
- 反応は,有利な4電子の経路を経由して進みます.
結論:
- 構造的に明確に定義されたマクロサイクル金属複合体は,NPMCにとって有望なプラットフォームを提供します.
- 開発された[CoN(4) ](3) /C触媒は,ORRの優れた性能を示しています.
- これらの発見は,効率的かつ費用対効果の高い新世代の燃料電池触媒の道を開く.
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