Abstract
A polytetrafluoroethylene (PTFE)/quaternized polysulfone (QNPSU) composite membrane has been fabricated for use in proton exchange membrane fuel cells (PEMFCs). The composite membrane is made by immobilising a QNPSU solution into a hydrophobic porous PTFE membrane. The structure of the composite membrane is examined by SEM and EDX. The ionic conductivity of the PTFE/QNPSU membrane, at a relative humidity lower than 0.5% and a temperature of 180 °C, is greater than 0.3 S cm-1, when loaded with 400% H3PO4. A hydrogen fuel cell with this membrane operating at 2.0 atmosphere absolute (atma) pressure and 175 oC gives voltages > 0.4 V at current densities of 1.0 A cm-2 using oxygen.
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