Development of High Temperature PA/PBI Polymer Electrolyte Membrane Fuel Cells
Technical Report,30 Sep 2016,29 Sep 2017
Curtin University Bentley Australia
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Operation of polymer electrolyte membrane fuel cells PEMFCs at elevated high temperature has significant advantages over the low temperature PEMFCs and allows for a much better fuel impurity tolerance and substantially higher reaction kinetics as well as simplified water management and cooling systems. This is particularly important for the liquid fuels based PEMFCs. Membranes of phosphoric acid PA doped polybenzimidazole PAPBI are among the most mutual and promising electrolyte systems in this connection, showing high proton conductivity at low water activity as well as good thermal and oxidative stability. However, PAPBI membrane based cells are limited at temperatures up to about 160 C. In the higher operating temperatures 180-200 C the PA loss rate increases considerably and becomes unstable, eventually leading to acid depletion and failure of the cell system. It is a grand challenge to develop polymeric materials based membranes for operation at temperatures higher than 200C.
- Electrochemical Energy Storage