Abstract
We present novel acid–base blend membranes with improved chemical stability and competitive fuel cell performance compared to conventional PBI membranes.
Highlights
phosphoric acid (PA)-doped PBI for use in HT-PEMFCs (100–220 C) can be traced back to the work of Savinell et al.[1]
A further disadvantage of PA-doped PBI is the chemical degradation of the polymer in the fuel cell,[6] which is mainly relevant in the temperature range 150–200 C, which is required for minimizing of carbon monoxide (CO) poisoning of the anode catalyst
The blend membranes showed good thermal stability and drastically improved chemical stability compared to pure PBI and AB-PBI by means of weight loss during Fenton's test (FT)
Summary
PA-doped PBI for use in HT-PEMFCs (100–220 C) can be traced back to the work of Savinell et al.[1]. Strategies include the preparation of base–excess acid–base blend membranes of PBI with acidic polymers in which the acidic blend component acts as macromolecular ionic cross-linker for the blend membrane by proton transfer from the acidic group onto the basic imidazole sites of the PBI. Such membranes have been a research and development topic in the group of one of the authors of this study for more than a decade.[7]. PCS14 a Additive: diiododecane. b Base–base blend membrane. c Poly(4-vinylpyridine), basic polymer
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