Durable sulfonated partially fluorinated polysulfones as membrane for PEM fuel cell

Maryam Mohammadi and Shahram Mehdipour-Ataei

Renewable Energy, 2020, vol. 158, issue C, 421-430

Abstract: A new structure of sulfonated-partially fluorinated random polysulfone based on a highly fluorinated monomer -decafluorobiphenyl- was developed as the fuel cell membrane. Decafluorobiphenyl was randomly distributed in the structure by applying non-stoichiometric amounts of reactants via a three-step polymerization reaction under mild condition. The random copolymers with sulfonation degrees of 30–60% revealed suitable water uptake and dimensional change with good mechanical stability despite an increased degree of sulfonation. Moreover, higher proton conductivity (71–250 mS/cm at 80 °C and 100% RH) compared to the routine random copolymers (120 mS/cm) was obtained. The optimum sample with 60% sulfonation showed a comparable power density of about 319.5 mW/cm2 with the reported random type polymer. The high current density of 1309 mA/cm2 was remarkable. Notably, with 60% sulfonation, only 4.85% voltage reduction was observed during 100 h OCV hold test under an accelerated ageing condition in fuel cell media.

Keywords: Durability; Fuel cell; Low-temperature coupling; Proton exchange membrane; Sulfonated-partially fluorinated polysulfone (search for similar items in EconPapers)
Date: 2020
References: View references in EconPapers View complete reference list from CitEc
Citations: View citations in EconPapers (2)

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Persistent link: https://EconPapers.repec.org/RePEc:eee:renene:v:158:y:2020:i:c:p:421-430

DOI: 10.1016/j.renene.2020.05.124

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