16.Ulusal Sıvıhal Fiziği Sempozyumu - Piri Reis Üniversitesi

AC Conduction Mechanism in Nafion
E. Öztürk Yılmaz 1 , D.Değer 1 , K.Ulutaş 1 , H. Deligöz 2
1 Ġstanbul University, Science Faculty, Physics Department, Vezneciler, Istanbul,
Turkey
2 Ġstanbul University, Engineering Faculty, Chemical Engineering Department,
Avcılar, Istanbul, Turkey.
Direct methanol fuel cell (DMFC) is a promising power source for
clean energy and is expected to be used as a portable power source. The
most important part of fuel cell is polymer electrolyte membrane (PEM)
[1–2]. Although Nafion membranes exhibit good performance and
durability during fuel cell operation, it has some absence like low
proton conductivity at high temperature, low mechanical strength and a
low glass transition temperature in a fully hydrated state [1-3]. On the
other side electrical characterizations of Nafion membranes are needed
to provide a general insight on their conductivity mechanism.
In this study, the ac conductivity of Nafion ® 117 (thickness 175µ) have
been determined in 10Hz -20MHz frequency range and -173K - 273K
temperature range. It was found that the ac conductivity of the Nafion
has been occurred proportional with ω s, s