Performance assessment of partially sulfonated PVdF-co-HFP as polymer electrolyte membranes in single chambered microbial fuel cells
By Vikash Kumar and Arpita Nandy and Suparna Das and M. Salahuddin and Patit P. Kundu
Published in Applied Energy
2015
Abstract
In the present study, PVdF-co-HFP copolymer and its sulfonated derivatives have been analyzed as polymer electrolyte membrane in single chamber MFCs. The sulfonation of PVdF-co-HFP copolymer was performed by treating with chlorosulfonic acid for 5, 7 and 9 h, resulting in 23%, 30%, and 18% of degree of sulfonation (DS) in the respective SP-5, SP-7, and SP-9 membranes. On observing the membranes under field emission scanning electron microscope fitted with EDAX, porosity was found to be increasing with increase in the duration of sulfonation except for 9 h duration. The elemental analysis of the membranes indicated the presence of higher sulfur and oxygen content with the increasing sulfonation duration except for 9 h duration, for which crosslinks were formed via sulfone linkages. The membranes were characterized for their ion exchange capacity (IEC) and proton conductivity; \IEC\ value of 0.21 meq g?1, 0.42 meq g?1, and 0.12 meq g?1 and proton conductivity of 0.0012 S cm?1, 0.00363 S cm?1, and 0.0006 S cm?1 were observed for SP-5, SP-7, and SP-9 membranes. Open air cathode \MFCs\ with membrane electrode assemblies (MEA) containing sulfonated and non-sulfonated PVdF-co-HFP membranes have been analyzed for their overall \MFC\ performance. It was observed that amongst these membranes, \MFC\ with SP-7 membrane showed the maximum power and current density of 290.176