An Impedance Study on the sPEEK/ZrO2 Membranes for Direct Methanol Fuel Cell Applications

• Type: Article in International Conference Proceedings Book
• Date: 2008

Authors

Silva, VB (Author) Other; Silva, VS (Author) Other; Luis Madeira (Author) FEUP; Nunes, SP (Author) Other; Adélio Mendes (Author) FEUP

Conference proceedings International

Title: ADVANCED MATERIALS FORUM IV

Pages: 926-930

13th Conference of the Sociedade-Portuguesa-de-Materiais/4th International Materials Symposium

Oporto, PORTUGAL, APR 01-04, 2007

Indexing

ISI Web of Knowledge - 1 Citation

Scopus - 4 Citations

Other information

Authenticus ID: P-004-2AC

Abstract (EN): Electrochemical impedance experiments were carried out in order to study the influence of the ZrO2 inorganic incorporation on the proton conductivity of sulfonated poly(ether ether ketone) (sPEEK) membranes. The impedance data was flitted to an extension of Randles' circuit, within the inorganic content and temperature ranges considered. The model fits quite well for ZrO2 loads up to 10 wt.%. Such a model allows for characterizing the diffusion phenomena (Warburg) of the membrane electrode assembly (MEA); membrane and electrodes resistances, capacitive and inductive behavior. Proton conductivity was obtained from the impedance spectra and it was observed that it increases with temperature and decreases with the inorganic content. As a general trend. the Warburg parameter decreases slightly with the temperature, except for the 5 wt.%, ZrO2 membrane that suffers a more pronounced influence. The Warburg parameter also decreases with the ZrO2 content.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 5