Journal
JOURNAL OF MEMBRANE SCIENCE
Volume 650, Issue -, Pages -Publisher
ELSEVIER
DOI: 10.1016/j.memsci.2022.120442
Keywords
Alkali-free quaternization; Polybenzimidazole; Phosphoric acid retention; Proton exchange membrane fuel cells; High-temperature
Categories
Funding
- National Key R&D Program of China [2018YFA0702001]
- Natural Science Foundation of China [21878239, 52003139]
- Guangdong Key RD Program [2020B0909040001, 2019B090909003]
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This study fabricates high-temperature proton exchange membranes with high phosphoric acid uptake and retention ability by solvent casting, which exhibit high anhydrous proton conductivity and stability.
Although phosphoric acid doped polybenzimidazole has been proposed as promising high-temperature proton exchange membrane, the poor absorption and immobilization ability of phosphoric acid in the membrane hinders its long-term stability. In this work, high-temperature proton exchange membranes with high phosphoric acid uptake and retention ability are fabricated thorough solvent casting of an alkali-free quaternized poly(4,4'-diphenylether-5,5'-bibenzimidazole) (OPBI), followed by doping of phosphoric acid. The optimized membrane with quaternization degree of 50% possesses a high acid-doping-level of 18.8 and an anhydrous conductivity of 85 mS cm(-1) at 160 degrees C. Stability tests reveal that anhydrous proton conductivity remains unchanged during continuous 100 h treatment at 160 degrees C and it remains 91.7% of its initial value after 100 h treatment at 80 degrees C under 40% RH. The thus-assembled single cell exhibits the maximum power density values of 0.355, 0.495, and 0.584 Wcm(-2) at 160 degrees C under back pressure of 0, 100, and 200 kPa using hydrogen as fuel and air as oxidant gas.
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