Dresden 2003 – wissenschaftliches Programm

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CPP: Chemische Physik und Polymerphysik

CPP 20: POSTER A

CPP 20.3: Poster

Montag, 24. März 2003, 19:00–21:00, ZEU/250

Radiotracer Diffusion of Sodium and Iodine in a PEO-NaI Polymer Electrolyte — •Shahmahmood Obeidi, Bouchaib Zazoum und Nicolaas A. Stolwijk — Institut für Materialphysik, Universität Münster, Wilhelm-Klemm-Str. 10, 48149 Münster

We investigated ion motion in an amorphous electrolyte consisting of poly(ethylene oxide) and sodium iodide by using the radioactive isotopes ²²Na and ¹²⁵I. Radiotracer penetration profiles were measured by means of microtome sectioning after isothermal diffusion annealing in a temperature range from 67 to 180^∘C. Self-diffusion coefficients determined from the observed (near-)Gaussian or (near-)erfc-type profile shapes can be described by Arrhenius equations with activation energies of 0.37eV for sodium and 0.30eV for iodine. It is observed that iodine is about a factor of 3 faster than sodium, in agreement with earlier reports on the mobility of cations and anions in polymer electrolytes.