| 학회 | 한국고분자학회 |
| 학술대회 | 2005년 봄 (04/14 ~ 04/15, 전경련회관) |
| 권호 | 30권 1호, p.431 |
| 발표분야 | 기능성 고분자 |
| 제목 | The Measurement of Transport Properties of Nafion based Nanocomposite Membrane for Direct Methanol Fuel Cells |
| 초록 | Methanol crossover is the major technical limitation for direct methanol fuel cells (DMFCs) to be commercialized as the portable and electric vehicle power sources. It results in depolarization losses at the cathode and fuel loss. Methanol crossover is accrued by two mechanisms; one is self-diffusion of methanol and the other is electro-osmotic drag. In order to investigate methanol permeability, electro-osmotic drag coefficient and ion-conductivity, we prepared Nafion-based composite membranes using conducting inorganic particles such as zirconium sulphophenyl phosphonate(ZrSPP) and non-conducting particles as montmorillonite(MMT). These inorganic particles have sheet layered structures and will exhibited excellent barrier properties due to tortuous paths for methanol molecules in the membrane. It would be expected that hydrophobic MMT is dispersed homogenously into Nafion, but hydrophilic ZrSPP is mainly located in hydrophilic region of Nafion. Thus, we tried to figure out the effect of the microstructure of composite membranes to methanol permeability, electro-osmotic drag coefficient and ion-conductivity. The methanol permeability was measured using a differential refractive index detection method and electro-osmotic drag measurements were carried out using special cell, which was utilized by Zawodizinski. The current interrupt method was employed for ion-conductivity measurement. The measured transport properties for Nafion117 have 2.3 cm2/s , 3 H20/H+and 0.05 S/cm , respectively, which agreed with those in other papers. |
| 저자 | 김민성, 김영택, 이희우 |
| 소속 | 서강대 |
| 키워드 | fuel cell; nafion; methanol crossover |
