Electrical Impedance Studies of Acid-Form NAFION Membranes
Interim technical rept. Apr 1993-May 1994
NAVAL ACADEMY ANNAPOLIS MD DEPT OF PHYSICS
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Electrical conductivitydielectric relaxation studies of acid form Nafion-1 17 have been carried out at frequencies from 10 to 10exp 8 Hz. By direct measurement, it is shown that when standard two terminal measurements are made across the thickness of a 0.18 mm film, it is necessary to use frequencies in excess of 10exp 7 Hz in order to observe the bulk conductivity of the sample. As a consequence, previous reports of a power law dependence for the electrical conductivity are not associated with the bulk electrical conductivity but rather are due to electrode effects and space charge. As confirmation, it is shown that by changing the geometry of the electrodes, the low frequency electrical response of the material is significantly changed. Nafion, Complex impedance, Electrical conductivity ion-exchange membrane, Dielectric relaxation.
- Physical Chemistry
- Electricity and Magnetism
- Radiofrequency Wave Propagation