Details

Autor(en) / Beteiligte

• Ponce, M.L
• Prado, L
• Ruffmann, B
• Richau, K
• Mohr, R
• Nunes, S.P

Titel

Reduction of methanol permeability in polyetherketone–heteropolyacid membranes

Ist Teil von

• Journal of membrane science, 2003-06, Vol.217 (1), p.5-15

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

2003

Quelle

Alma/SFX Local Collection

Beschreibungen/Notizen

• Organic–inorganic membranes for direct methanol fuel cell (DMFC) application were prepared, using an organic matrix of sulfonated polyetherketone (s-PEK), different heteropolyacids and an inorganic network of ZrO 2 or RSiO 3/2. The membranes were characterized concerning their methanol and water permeability by pervaporation and ionic conductivity by impedance spectrometry. The bleeding out of the heteropolyacid from the membrane was quantified. The presence of the ZrO 2 decreases the methanol and water permeability and reduces the bleeding out of the heteropolyacid. Molybdophosphoric acid (MoPA) was also investigated, showing a more pronounced bleeding out effect, which could be reduced by modifying the anion structure with the inclusion of Ni or Si. High conductivity values were obtained with membranes containing tungstophosphoric acid (TPA).