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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
Published on: August 12, 2013
燃料電池の電解質としての固体酸
S M Haile1, D A Boysen, C R Chisholm
1Materials Science, California Institute of Technology, Pasadena 91125, USA. smhaile@caltech.edu
Nature
|April 20, 2001
まとめ
セシウム硫酸水素のような固体酸の電解質は,現在のポリマー膜の限界を克服し,高温燃料電池の有望性を示しています. これらの材料は,無水質の陽子輸送と湿気条件下での安定した性能を提供します.
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
- エネルギー変換 エネルギー変換
背景:
- ポリマー電解質膜燃料電池 (PEMFCs) は,湿気操作条件と低温操作 (<100°C) によって制限されています.
- PEMFCはメタノールと水素の浸透性に苦しんでおり,燃料効率が低下しています.
- 固体酸は,無水質の陽子輸送と高温安定性 (250°Cまで) を提供しています.
研究 の 目的:
- 燃料電池の電解質として高温で動作する固体酸の活性を調査する.
- 高温での固体酸の水溶性および柔性性の限界に対処するために.
- セシウム硫酸水素 (CsHSO4) の電解質膜の電気化学性能と安定性を評価するために.
主な方法:
- CsHSO4エレクトロライト膜の製造 (約. 厚さ1.5mm) となっている.
- 150~160°CでCsHSO4膜を用いたH2/O2燃料電池の試験
- 湿った大気にさらされた後の電解質の性質の評価.
主要な成果:
- CsHSO4燃料電池は有望な電気化学性能を示した:オープン回路の電圧は1.11V,電流密度は44mAcm-2.
- 固体酸の性質は,湿った大気への曝露によって影響を受けなかった.
- セルは,従来のPEMFCsの限界を大幅に上回る温度で効果的に動作しました.
結論:
- CsHSO4固体酸電解質は,高温燃料電池の応用の可能性を示しています.
- より薄い電解質の製造技術を開発し,硫黄の減少を含む長期的な安定性を評価するためにさらなる研究が必要です.
- 固体酸は,燃料電池技術における現在の限界を克服するための実行可能な代替案です.
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