TY - GEN
T1 - SPEEK-based composite membranes for direct methanol fuel cells
AU - D'Epifanio, A.
AU - Mecheri, B.
AU - Weise, F. C.
AU - Greenbaum, S.
AU - Traversa, E.
AU - Licoceia, S.
PY - 2009
Y1 - 2009
N2 - Sulfonated polyether ether ketone (SPEEK)-based composite membranes doped with 23 and 50 wt% of hydrated tin oxide (Sn02nH2O) were prepared and characterized for Direct Methanol Fuel Cell (DMFC) applications . The composite membranes were characterized in terms of ion exchange capacity (IEC), tensile tests, water uptake measurements, electrochemical impedance spectroscopy (EIS), and Pulsed-field-gradient spin-echo nuclear magnetic resonance (PFGSE NMR) spectroscopy. The body of results indicated the involvement of hydrated tin oxide in the proton conduction mechanism, the inorganic phase providing additional paths between the water clusters for proton transport. NMR measurements evidenced that Sn02 nH2O particles not only facilitate the proton transport but also hinder water diffUsion. Therefore, due to the selectivity of Sn02nH2O for proton diffUsion, the filler effect was found to be also beneficial for the reduction of methanol crossover through the SPEEK membrane and for improving the perfonnance of the SPEEK membrane when used as electrolyte in a DMFC test station.
AB - Sulfonated polyether ether ketone (SPEEK)-based composite membranes doped with 23 and 50 wt% of hydrated tin oxide (Sn02nH2O) were prepared and characterized for Direct Methanol Fuel Cell (DMFC) applications . The composite membranes were characterized in terms of ion exchange capacity (IEC), tensile tests, water uptake measurements, electrochemical impedance spectroscopy (EIS), and Pulsed-field-gradient spin-echo nuclear magnetic resonance (PFGSE NMR) spectroscopy. The body of results indicated the involvement of hydrated tin oxide in the proton conduction mechanism, the inorganic phase providing additional paths between the water clusters for proton transport. NMR measurements evidenced that Sn02 nH2O particles not only facilitate the proton transport but also hinder water diffUsion. Therefore, due to the selectivity of Sn02nH2O for proton diffUsion, the filler effect was found to be also beneficial for the reduction of methanol crossover through the SPEEK membrane and for improving the perfonnance of the SPEEK membrane when used as electrolyte in a DMFC test station.
UR - http://www.scopus.com/inward/record.url?scp=70349273780&partnerID=8YFLogxK
M3 - Conference contribution
AN - SCOPUS:70349273780
SN - 9781605110981
SN - 9781605110981
T3 - Materials Research Society Symposium Proceedings
SP - 93
EP - 98
BT - Materials Research Society Symposium Proceedings - Solid-State Ionics - 2008
T2 - Solid-State Ionics 2008 - 2008 MRS Fall Meeting
Y2 - 1 December 2008 through 5 December 2008
ER -