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- W2034299313 abstract "Abstract Here a new membrane design concept to improve proton conductivity and to maintain a constant acid doping level for an extended period of time for medium-temperature and low-humidity polymer electrolyte fuel cells (MT/LH-PEFC) is presented. A polymer electrolyte membrane is prepared via thermal rearrangement of hydroxyl-containing polyimide (HPI) precursor membranes over 350 °C, followed by subsequent acid-impregnation. The thermal treatment for 1 h converts HPI into a thermally rearranged polybenzoxazole (TR-PBO) membrane with high surface area, similar to zeolites. The microporous structure and the basic sites (–C N–) in benzoxazole moieties contribute to the stable impregnation of small acidic molecules (e.g., HCl, HNO 3 , H 3 PO 4 , and HPF 6 ) in large quantities within the polymer matrix. The acid-doping level decreases with the increasing size of acidic dopants. TR-PBO impregnated using HCl with the smallest radius has a much higher doping level and excellent proton conductivity (1.60 × 10 −1 S cm −1 at 130 °C and RH 28%) when compared with PBI (6.59 × 10 −2 S cm −1 at the same conditions). Different from a common acid-doped PBI system, the acid-doped TR-PBO membranes do not exhibit a severe acid leaching even in repeated heating and cooling cycles between 90 and 130 °C." @default.
- W2034299313 created "2016-06-24" @default.
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- W2034299313 date "2014-02-01" @default.
- W2034299313 modified "2023-09-24" @default.
- W2034299313 title "Highly proton-conductive thermally rearranged polybenzoxazole for medium-temperature and low-humidity polymer electrolyte fuel cells" @default.
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- W2034299313 doi "https://doi.org/10.1016/j.jpowsour.2013.08.111" @default.
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