高電流密度のナフィオンサンドウィッチ構造を通して選択的なプロトン/デュテロン輸送
Saheed Bukola1, Ying Liang2, Carol Korzeniewski2
1Department of Chemistry, Clemson University , Clemson, South Carolina 29634, United States.
Journal of the American Chemical Society
|January 20, 2018
まとめ
単層グラフェンは,ポリエレクトロライト膜水素ポンプで高いイオン電流密度を可能にします. このグラフェンベースのシステムは 陽子とデュテロン輸送を大幅に改善し 効率的な水素燃料技術への道を開いています
科学分野:
- 材料科学
- 電気化学
- ナノテクノロジー
背景:
- ポリエレクトロライト膜 (PEM) 燃料電池は水素エネルギーにとって不可欠です.
- 効率的なイオン輸送は 燃料電池の性能の鍵です
- グラフェンの独特な特性により 膜の新たな応用が可能です
研究 の 目的:
- PEM型の水素ポンプセルで単層グラフェンを通した陽子とデュテロン輸送を調査する.
- 水素同位体に対するグラフェンのイオン伝導性と選択性を定量化する.
- 選択的なイオン伝導層としてのグラフェンの可能性を探求する.
主な方法:
- 水素ポンプのセル内のナフィオン膜の間に挟まれた単層グラフェンの製造.
- グラフェンの品質と整合性を確認するためにラマン光譜を用いる.
- 適度なバイアス電圧下でのイオン電流密度と伝導度を測定する.
主要な成果:
- 陽子とデュートロンの伝達のために1Acm-2近くのイオン電流密度を達成した.
- 取得した高面積正規化されたイオン伝導度は,陽子では ~29 S cm-2 と,デウテロンでは ~2.1 S cm-2 である.
- 大量の陽子輸送を許容しながら,カリウムイオン移転の有意な衰弱を証明した.
結論:
- 単層グラフェンは,PEM型の装置で高効率な陽子とデュテロン輸送を促進します.
- グラフェンは重いイオンを 陽子よりもはるかに弱体化させることで 驚くべき選択性を示しています
- この発見は,電子化学の応用における高度なイオン選択層としてのグラフェンの可能性を示唆しています.
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