Development of polymer alkaline electrolyte membrane fuel cell (PAEMFC) based on alkali-doped Polybenzimidazole (PBI)

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This project is based on the results we have published, for the first time, in Electrochemistry Communications (in 2000, pages 697-702) which have shown that hydrogen/oxygen polymer electrolyte membrane fuel cells (PEMFCs) based on alkaline-doped polybenzimidazole (PBI) is feasible. These non speculative results have been slightly improved (  optimization of the membrane modification conditions) by the applicant this last year. Accordingly the aim of this project, in close collaboration of the industrial partner (Astris Energi Inc.), is to use this concept we introduced and to develop new optimized hydrogen/oxygen Polymer Alkaline Electrolyte Membrane Fuel Cell (PAEMFC) based on alkaline-doped PBI. Thin films of PBI will be cast by solvent evaporation from the dissolution of commercial PBI powder in an appropriate solvent. The optimized experimental conditions of the films preparation will be determined. The type and concentration of the doping alkaline agent, the casting temperature and time, etc. will be identified. Their conductivity will be measured as functions of temperature, and their value will be correlated to the casting conditions. Ways to get very conductive alkaline-doped PBI which can be operated in a PAEMFC cell in a range of temperatures compatible with the membrane stability will be determined. Their thermal stability under fuel cell operating conditions will also be assessed. Anode electrodes based on Raney-nickel catalyst and cathode electrodes based on silver catalyst dispersed onto carbon will be prepared on carbon cloth gas diffusion electrode. These electrodes will be developed in close collaboration with supporting organization (Astris Energi Inc.) which scientists are experts in the electrode structures in alkaline fuel cell. Strategies to develop membrane electrode assembly (MEA) based on these alkaline doped-PBI membranes and these anode and cathode electrodes will be determined. The best MEAs will be characterised and tested in hydrogen /oxygen Polymer Alkaline Electrolyte Membrane fuel Cells.