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  • 02월 22일 16시 이후 : 초록수정 불가능, 일정확인 및 검색만 가능

Crossover of Methanol and Oxidation Intermediates in DMFCs Observed by 13 C MAS NMR [우수포스터상]

등록일
2008년 2월 13일 15시 18분 50초
접수번호
1125
발표코드
35P241포 이곳을 클릭하시면 발표코드에 대한 설명을 보실 수 있습니다.
발표시간
금 <발표Ⅲ>
발표형식
포스터
발표분야
전기화학
저자 및
공동저자
김성수, 한옥희
한국기초과학지원연구원 대구센터, Afghanistan
Previously we reported a new type of membrane electrode assembly (MEA) for a DMFC single cell from which the polymer electrolyte membrane (PEM) could be extracted free of electrode components such as catalysts, carbon black, and carbon cloth. Solid-state magic-angle spinning (MAS) NMR investigation of this PEM allowed, for the first time, direct detection of not only methanol but also its reaction intermediates travelling through the PEM during the fuel cell operations. Major reaction intermediates of methanol oxidations such as formic acid and methyl formate were detected. The 13C signals at 166 and 163 ppm, consisting of at most only ca. 2 % of the methanol signal intensity, are from the formic group (HCOO) of formic acid and methyl formate, respectively. Spectra were acquired at various reaction conditions such as different current densities but at the same power density or different power densities. There were inverse linear relationships between the peak areas of formic signals and the power densities or the current densities.

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