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Issue 47, 2018
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Sulfonated aromatic polymers containing hexafluoroisopropylidene groups: a simple but effective structure for fuel cell membranes

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Abstract

Partially fluorinated and sulfonated aromatic copolymers (SBAFs) were designed and synthesized as chemically stable, highly proton conductive membranes for fuel cell applications. The effect of hexafluoroisopropylidene groups on the membrane properties was investigated in detail by comparing with those of our previous sulfonated polyphenylene ionomer (SPP-QP) membranes. SBAFs were obtained by a Ni(0)-promoted coupling reaction with high molecular weight (Mw > 158 kDa and Mn > 42 kDa) to provide thin membranes with three different ion exchange capacities (IECs), 1.5, 2.5, and 3.0 mequiv. g−1. SBAF membranes showed higher water uptake and proton conductivity than those of SPP-QP membranes with comparable IEC values. The stress/strain curves and DMAs revealed that SBAF and SPP-QP membranes were similarly mechanically stable. The chemical stability evaluated by Fenton's test suggested that isopropylidene groups were intact under harsh oxidative conditions. In an H2/O2 fuel cell, SBAF membranes exhibited better performance (in particular, at low humidity) and durability than those of SPP-QP membranes. During an open circuit voltage (OCV) hold test, the SBAF fuel cell retained a high OCV value over 0.9 V with minor loss up to 1000 h (the average decay was −40 μV h−1).

Graphical abstract: Sulfonated aromatic polymers containing hexafluoroisopropylidene groups: a simple but effective structure for fuel cell membranes

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Publication details

The article was received on 04 Oct 2018, accepted on 15 Nov 2018 and first published on 15 Nov 2018


Article type: Paper
DOI: 10.1039/C8TA09587F
Citation: J. Mater. Chem. A, 2018,6, 24625-24632

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    Sulfonated aromatic polymers containing hexafluoroisopropylidene groups: a simple but effective structure for fuel cell membranes

    J. Ahn, R. Shimizu and K. Miyatake, J. Mater. Chem. A, 2018, 6, 24625
    DOI: 10.1039/C8TA09587F

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