TY - GEN
T1 - An impedance study on the sPEEK/ZrO2 membranes for direct methanol fuel cell applications
AU - Silva, V. B.
AU - Silva, V. S.
AU - Madeira, L. M.
AU - Nunes, S. P.
AU - Mendes, A.
PY - 2008
Y1 - 2008
N2 - 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 fitted 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.
AB - 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 fitted 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.
KW - Analogue circuit
KW - Electrochemical impedance spectroscopy (EIS)
KW - Proton conductivity
KW - sPEEK/ZrO membranes
UR - http://www.scopus.com/inward/record.url?scp=60349104182&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:60349104182
SN - 9780878493739
T3 - Materials Science Forum
SP - 926
EP - 930
BT - Advanced Materials Forum IV - Selected, peer reviewed papers from the IV International Materials Symposium Materiais 2007 and XIII Encontro da Sociedade Portuguesa de Materiais - SPM
A2 - Marques, Antonio Torres
A2 - Marques, Antonio Torres
A2 - Baptista, Antonio Paulo Monteiro
A2 - Silva, Antonio Fernando
A2 - Alves, Fernando Jorge Lino
A2 - Sa, Carlos
A2 - Malheiros, Luis Filipe
A2 - Vieira, Manuel
A2 - Vieira, Manuel
PB - Trans Tech Publications Ltd
T2 - Advanced Materials Forum IV - Selected, peer reviewed papers from the 4th International Materials Symposium Materiais 2007 and 8th Encontro da Sociedade Portuguesa de Materiais - SPM
Y2 - 1 April 2007 through 4 April 2007
ER -