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Cross-linked sulfonated aromatic ionomers via SO 2 bridges: Conductivity properties

descriptionPublicationkeyboard_double_arrow_right Article , Journal 01 Dec 2013 Italy Publisher:Elsevier BVJournal:Journal of Power Sources, volume 243, pages 488-493 (issn: 0378-7753,

Authors: Riccardo Narducci; Riccardo Narducci; Anna Donnadio; M.L. Di Vona; K. Pelzer; Philippe Knauth; Luca Pasquini; +2 Authors

doi: 10.1016/j.jpowsour.2013.05.127

handle: 2108/102696 , 11391/1176682

Cross-linked sulfonated aromatic ionomers via SO 2 bridges: Conductivity properties

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Abstract

Abstract The proton conductivity of SPEEK membranes in situ cross-linked by thermal treatment at 180 °C for various times was investigated by impedance spectroscopy. The conductivity measurements were made on fully humidified membranes between 25 and 65 °C and on membranes exposed to different relative humidity between 80 and 140 °C. The Ionic Exchange Capacity (IEC) was determined by acid-base titration and the water uptake by gravimetry. The proton conductivity was determined as function of temperature, IEC, degree of cross-linking and hydration number. A curve of proton conductivity vs. hydration number allows predicting that in order to reach a value of 0.1 S/cm at 100 °C a hydration number above 20 is necessary. The measured conductivity at this temperature is 0.16 S/cm for a hydration number of 60.

Country

Italy

Related Organizations

Keywords

Mobility, SPEEK, Proton conductivity, Fuel cell, Fuel cells; Mobility; Polymers; Proton conductivity; SPEEK, Settore CHIM/03 - CHIMICA GENERALE E INORGANICA, sulfonated ionomers; crosslinking; aromatic ionomers; sulfone bridge, [CHIM] Chemical Sciences, Settore CHIM/07 - FONDAMENTI CHIMICI DELLE TECNOLOGIE, Polymer

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