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Increased Water Retention in Polymer Electrolyte Membranes at Elevated Temperatures Assisted by Capillary Condensation

등록일
2009년 8월 12일 15시 00분 18초
접수번호
0378
발표코드
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발표시간
금 16시 : 15분
발표형식
심포지엄
발표분야
고분자화학 - Novel Functional Nanostructures: ㅡ Materials, Structures, Properties and Applications Ⅱ
저자 및
공동저자
박문정
포항공과대학교 화학과, 첨단재료학부, Korea
We have created microstructured membranes, composed of hydrophilic and hydrophobic domains that are more effective at extracting water from the surrounding air when the temperature of the air is increased at constant relative humidity up to temperatures as high as 90 °C. This unexpected behavior is seen when the width of the hydrophilic domains is less than 5 nm. The widths of the moist hydrophilic phases were measured by cryogenic electron microscopy experiments performed on humid membranes. Simple calculations suggest that capillary condensation is important at these length scales. The correlation between moisture content and proton conductivity of the membranes is demonstrated. Not surprisingly, the proton conductivity of these membranes also increases with increasing temperature. While this property may enable the construction of more efficient, high-temperature polymer electrolyte fuel cells, our main accomplishment is that we have uncovered a new methodology for systematically controlling the moisture content of microstructured materials.

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