Abstract
Sulfonated Diels Alder poly(phenylene) (SDAPP) was examined for vanadium redox flow battery (VRFB) use. The ion exchange capacity (IEC) was varied from 1.4, 1.6 and 2.0meq/g in order to tune the proton conductivity and vanadium permeability. Coulombic efficiencies between 92 to 99% were observed, depending on IEC (lower IEC, higher coulombic efficiencies). In all cases the SDAPP displayed comparable energy efficiencies (88–90%) to Nafion 117 (88%) at 50mA/cm2. Membrane durability also was dependent on IEC; SDAPP with the highest IEC lasted slightly over 50cycles while SDAPP with the lowest IEC lasted over 400cycles and testing was discontinued only due to time constraints. Durability screening tests were initialed with SDAPP, by soaking films in a 0.1MV5+ and 5.0M total SO4−2 solution. The rate of degradation was also proportional with IEC; the 2meq/g sample dissolved within 376h, the 1.6meq/g sample dissolved after 860h, while the 1.4meq/g sample broke apart after 1527h.
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