Proton transport in radiation-grafted membranes for fuel cells as detected by SECM
2003; Elsevier BV; Volume: 5; Issue: 7 Linguagem: Inglês
10.1016/s1388-2481(03)00117-6
ISSN1873-1902
AutoresTanja Kallio, Christopher J. Slevin, Göran Sundholm, Peter Holmlund, Kyösti Kontturi,
Tópico(s)Analytical Chemistry and Sensors
ResumoScanning electrochemical microscopy (SECM) has been applied to investigate counter ion transport through four different proton conducting membranes with poly(styrene sulfonic acid) side chains. These membranes, intended for the polymer electrolyte fuel cell, are based on PVDF and PVDF-co-HFP matrix materials and have been prepared by an irradiation grafting method. SECM is found to be suitable for mapping variations in proton diffusion coefficient and concentration in these inhomogeneous membranes. It was found that the variations in these parameters are most considerable in a membrane with a high degree of grafting. Ionic conductivities measured with impedance spectroscopy were in agreement with calculated values obtained on the basis of the SECM measurements.
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