A polytetrafluoroethylene/quaternized polysulfone membrane for high temperature polymer electrolyte membrane fuel cells |
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| Authors: | Mingqiang Li Keith Scott |
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| Affiliation: | a School of Energy and Power Engineering, Dalian University of Technology, 116023 China
b Chemical Engineering and Advanced Materials, University of Newcastle, NE1 7RU UK |
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| 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 immobilizing 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 °C gives voltages >0.4 V at current densities of 1.0 A cm−2 using oxygen. |
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| Keywords: | Porous polytetrafluoroethylene composite membrane Quaternized polysulfone Phosphoric acid High temperature Proton conductivity Fuel cell |
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