%0 journal article
%@ 0376-7388
%A Silva, V., Ruffmann, B., Silva, H., Mendes, A., Madeira, L., Pereira Nunes, S.

%D 2006
%J Journal of Membrane Science
%N 1-2
%P 137-144 
%R doi:10.1016/j.memsci.2006.07.027
%T Zirconium oxide hybrid membranes for direct methanol fuel cells- Evaluation of transport properties
%U https://doi.org/10.1016/j.memsci.2006.07.027
1-2 
%X that proton conductivity decreases when thickness increases for the sPEEK composite membrane with SD of 87%; the same effect is observed for Nafion®. In contrast, it was found that the membrane thickness has almost no effect on the proton conductivity for sPEEK with SD = 71%. In terms of water uptake, it was found that it slightly increases with the thickness for all the sPEEK membranes tested, while the effect on Nafion® is far more evident. For most of the studied membranes, methanol and water permeation fluxes, as well as selectivity towards water/methanol, decrease with the membrane thickness. Finally, it was found that the zirconium oxide incorporation in the sPEEK polymer leads to membranes with decreased proton conductivity, water swelling and water and methanol permeation fluxes. However, it increases the composite membranes selectivity towards water/methanol.