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

DI VONA, M.l., Pasquini, L., Narducci, R., Pelzer, K., Donnadio, A., Casciola, M., et al. (2013). Cross-linked sulfonated aromatic ionomers via SO2 bridges: Conductivity properties. JOURNAL OF POWER SOURCES, 243, 488-493 [10.1016/j.jpowsour.2013.05.127].

Cross-linked sulfonated aromatic ionomers via SO2 bridges: Conductivity properties

DI VONA, MARIA LUISA;Narducci, R;
2013-01-01

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
2013
Pubblicato
Rilevanza internazionale
Articolo
Esperti anonimi
Settore CHIM/07 - FONDAMENTI CHIMICI DELLE TECNOLOGIE
Settore CHIM/03 - CHIMICA GENERALE E INORGANICA
English
Con Impact Factor ISI
Fuel cells; Mobility; Polymers; Proton conductivity; SPEEK
DI VONA, M.l., Pasquini, L., Narducci, R., Pelzer, K., Donnadio, A., Casciola, M., et al. (2013). Cross-linked sulfonated aromatic ionomers via SO2 bridges: Conductivity properties. JOURNAL OF POWER SOURCES, 243, 488-493 [10.1016/j.jpowsour.2013.05.127].
DI VONA, Ml; Pasquini, L; Narducci, R; Pelzer, K; Donnadio, A; Casciola, M; Knauth, K
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2108/102696
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