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- Title
Novel Proton Conducting Membranes from the Combination of Sulfonated Polymers of Polyetheretherketones and Polyphosphazenes Doped with Sulfonated Single-Walled Carbon Nanotubes.
- Authors
Luo, Tianwei; Xu, Hulin; Li, Zhong; Gao, Shuitao; Ouadah, Amina; Zhang, Zeyu; Zhang, Yanxia; Wang, Fang; Jing, Chaojun; Zhu, Changjin
- Abstract
Intent on developing efficient proton exchange membranes used for direct methanol fuel cells as well as hydrogen fuel cells, a series of membranes based on sulfonated polyetheretherketone and sulfonated polyphosphazene-graft copolymers is prepared by cross-linking reaction because the former material has good enough mechanical property, while the latter is excellent in the proton transfer. The cross-linked membranes combine the advantages of the two kinds of polymers. Among them, the membrane poly[(4-trifluoromethylphenoxy)(4-methylphenoxy)phosphazene]-g-poly {(styrene)11-r-[4-(4-sulfobutyloxy)styrene]33-sulfonated poly(ether ether ketone)75 (CF3-PS11-PSBOS33-SPEEK75) shows a proton conductivity at 0.143 S cm−1 under fully hydrated conditions at 80 °C and performs tensile strength about five times as much as did the sulfonated polyphosphazene membrane CF3-PS11-PSBOS33. Further doping of sulfonated single-walled carbon nanotubes (S-SWCNTs) into the cross-linked membranes on the screening of additives gives composite membrane CF3-PS11-PSBOS33-SPEEK75-SWCNT possessing proton conductivity of 0.196 S cm−1, even higher than that of Nafion 117 and a tensile strength comparable to that of Nafion 117. However, this significance of the composite membrane in the proton conduction is not observed in the test with a H2/air fuel cell when it shows a maximal power density of 280 mW cm−2 at 80 °C, whereas 294 mW cm−2 is observed for CF3-PS11-PSBOS33-SPEEK75.
- Subjects
PROTON conductivity; PROTON exchange membrane fuel cells; SULFONATES; POLYPHOSPHAZENES; SINGLE walled carbon nanotubes
- Publication
Macromolecular Materials & Engineering, 2017, Vol 302, Issue 7, pn/a
- ISSN
1438-7492
- Publication type
Article
- DOI
10.1002/mame.201700095