Eect of cations on the diusivity of the charge carriers in polyaniline membranes
نویسندگان
چکیده
The bulk and interfacial transport properties of PANI free-standing membranes have been investigated in acidic media with chloride as common counter-ion and with dierent co-ions, using the a.c. impedance technique with a four-electrode cell. The experimental data were compared to a recently proposed theoretical expression, based on use of the Nernst±Planck equation for mass transport and on slow discharge for ionic interfacial transfer. Though the only transport properties addressed in this model are the counter-ion and the polaron mobilities, experiments show an in ̄uence of the co-ion. In the case of multiple charge cations, especially Zn, all mobilities are strongly reduced. # 1999 Elsevier Science Ltd. All rights reserved.
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