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ITS » Master Theses » Luar ITS Posted by email@example.com at 01/09/2016 15:10:07 • 1630 Views
SYNTHESIS AND CHARACTERIZATION OF SULFONATED ZIRCONIUM PHOSPHATEPERFLUOROSULFONATED COMPOSITE MEMBRANE FOR FUEL CELL APPLICATIONS
Author : HIKMATUN NIMAH ( 198410102009122006 )
A new class of nanocomposite membrane has been developed by incorporating cross-linked polysiloxane-bearing zirconium-phosphate nanoplates into Nafion matrix via sol-gel process followed by solution casting and sulfonating. The chemical structures of the composite membranes were confirmed by FT-IR 31P-MAS NMR and XPS spectra. SEM characterization was used to observe the morphology of the composite membranes. All the composite membranes were characterized in terms of IEC water uptake methanol permeability proton conductivity state of water and oxidative stability. Best results were obtained on the C composite membrane recast from polysiloxane-zirconium phosphateNafion 20wt solid content with a polysiloxane zirconium phosphate molar ratio of 11. The methanol permeability of the C composite membranes is 5.5x10-7 cm2s-1 at 30oC. Its proton conductivity is 0.050 Scm at 30oC 0.164 Scm at 95oC in 95RH and 1.110-2 Scm at 80oC in 30RH which outperformed the pure Nafion 117 membrane whose conductivity is 0.026 Scm at 30oC 0.071 Scm at 95oC in 95RH and 5.110-3 Scm at 80oC in 30RH under the same condition. The C composite membrane also shows acceptable oxidative stability in Fentons reagent at 80oC for 1 h which retains 98.81 of its original weight after testing and only declines of 11 after testing for 125 hours. The PEM fuel cells assembled with C composite membrane shows good performance at 100oC of 499.9mWcm2. This work demonstrates the promising potential of the modified polysiloxane-zirconium phosphateNafion composite membranes for the development of high-performance and high-stability PEM fuel cells at high temperatures.
Zirconium-phosphate nanoplates; Nafion; Polysiloxanes; Fuel cells; Composite membrane; Sol-gel process