ASSESSING THE ELECTRICAL CONDUCTIVITY OF BENZENE SOLFUNICAS AN ELECTROLYTE FOR FUEL CELLS MEMBRANES` IN HIGH AND LOW OPERATING TEMPERATURES
Nafion and PA doped PBI membranes have been considered to be the most promising membranes for low and high temperatures PEMFC, respectively. However, there have been some limitations for them. Nafion’s membranes could suffer catalyst deactivation and water flooding at the cathode side. On the other hand, PA doped PBI struggle low oxygen solubility; strong phosphate anion adsorption on the catalyst surface. This research was to test the electrical conductivity of BSA doped PBI membrane in low and high operating temperatures for fuel cells.
The electrical conductivity tests were conducted by the two Pt probe technique. The electrical conductivity of BSA doped PBI membranes were very weak (0.0005S.cm-1) at high temperatures > 100oC compared to PA doped PBI membrane. In contrast, BSA doped PBI membrane performed higher electrical conductivity than H3PO4 doped PBI membrane and Nafion’s membranes at low temperatures (40-80oC). This was proved with 0.28372 S.cm-1at 40oC for BSA doped PBI higher than 0.05681S.cm-1at 80oC for Nafion’s membranes and 0.038S.cm-1 at 140oC for PA. The promising high electrical conductivity of BSA doped PBI membranes at low temperatures in comparison of PA and Nafion’s membranes encourages conducting further future studies to test oxygen reduction reactions and to perform I-V polarizations in order to evaluate its electrical power output.