Decoupling ion conductivity and fluid permeation through optimizing hydrophilic channel morphology

Peter Po Jen Chu, Yu Shin Fang, Yu Chen Tseng

研究成果: 書貢獻/報告類型會議論文篇章同行評審

摘要

Approaches to improve membrane ion conductivity usually leads to higher degree of swelling, more serious fuel cross-over and often sacrificed membrane mechanical strength. Preserving all three main membrane properties is a tough challenge in searching high ion conducting fuel cell membrane. The long standing dilemma is resolved by decoupling ion conduction and fluid permeation property by creating optimized channel morphology using external electric field poling. Success of this approach is demonstrated in the proton conducting membrane composed of poly(ether sulfones) (PES) and sulfonated poly(ether ether ketone) (sPEEK, degree of sulfonation=50%) composites prepared under electric field poling condition. The external field enhanced the aromatic chain ordering from both sPEEK and PES and improved the miscibility. This induced interaction is conducive to the formation of more densely packed amorphous domains that eventually leads to preferentially ordered hydrophilic proton conducting channels having a average dimension (3 nm) smaller than that in generic sPEEK or Nafion. The narrower but more ordered channel displayed much lower methanol permeability (3.17×10-7 cm2/s), and lower swelling ratio (31.20%), while the conductivity (∼10-1 S/cm) is higher than that of Nafion, or sPEEK at higher (64%) degree of sulfonation. The composite is chemically stable and highly durable with improved membrane mechanical strength. Nearly 50% increase of DMFC power output is observed using this membrane, and the best power density is recorded at 155 mA/cm2 (80 °C, 1M Methanol).

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主出版物標題VIII International Conference on "Times of Polymers and Composites"
主出版物子標題From Aerospace to Nanotechnology
編輯Alberto D'Amore, Luigi Grassia, Domenico Acierno
發行者American Institute of Physics Inc.
ISBN(電子)9780735413900
DOIs
出版狀態已出版 - 18 5月 2016
事件8th International Conference on Times of Polymers and Composites: From Aerospace to Nanotechnology - Ischia, Naples, Italy
持續時間: 19 6月 201623 6月 2016

出版系列

名字AIP Conference Proceedings
1736
ISSN(列印)0094-243X
ISSN(電子)1551-7616

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???event.eventtypes.event.conference???8th International Conference on Times of Polymers and Composites: From Aerospace to Nanotechnology
國家/地區Italy
城市Ischia, Naples
期間19/06/1623/06/16

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