期刊
ELECTROCHIMICA ACTA
卷 302, 期 -, 页码 428-440出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2019.01.112
关键词
Block copolymer; Sulfonation; Polysulfone; PEMFC; Proton exchange membranes
资金
- mobility grant of IAAB from Universidad Carlos III de Madrid
- regional government [Comunidad de Madrid] [MATERYENER3CM S2013/MIT-2753, S2013/MAE-2975 PILCONAER]
- European Social Fund (ESF)
- Spanish Government, MINECO [MAT2016-78362-C4-3R, ENE2017-86711-C3-1-R]
Sulfonated multiblock copolymers composed of Polysulfone (PSU) and Polyphenylsulfone (PPSU) poly(ether sulfone) segments (SPSU/SPPSU) are synthesized for the first time by polycondensation in a one-pot two-step synthesis of commercial monomers, followed by sulfonation reaction with trimethylsilyl chlorosulfonate (TMSCS). Both segments are responsible for proton conductivity, although the PSU block has greater affinity to be sulfonated. Even though no microphase separation is detected, the resulting ionomers exhibit good mechanical properties due to the non-sulfonated blocks remaining and to the high molecular weights of the ionomers. The chemical structure is confirmed by H-1-NMR, F-19-NMR and FTIR analysis. The degree of sulfonation (0.93-1.58) is determined from the IEC values and H-1-NMR spectra. In situ through-plane proton conductivity measured on the MEAs is 34.1 mS cm(-1) at 70 degrees C. A maximum power density of 400 mW cm(-2), a current density of 1100 mA cm(-2) and outstanding thermo-mechanical stability, these proton-conducting membranes can therefore be implemented in PEMFC. (C) 2019 Elsevier Ltd. All rights reserved.
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