Jump to main content
Jump to site search


Poly(phenylene sulfide sulfone) based membranes with improved stability for vanadium redox flow batteries

Abstract

The use of sulfonated poly(phenylene sulfide sulfone) (sPSS) membranes as a possible solution to the stability issue of polyaromatic membranes in vanadium redox flow batteries is here proposed. sPSS has been synthesized and compared with Nafion and sulfonated poly(ether ether ketone) (sPEEK) of comparable degree of sulfonation. The membranes, prepared by solution casting, have been tested in terms of vanadium crossover and proton conductivity. The different diffusion profiles have been explained by thermoporometry, which shed light on the microstructure of the membranes under study. sPSS displayed the best combination of proton conductivity and permeability that resulted in a selectivity ratio about 3.5 times higher than sPEEK and Nafion. Degradation test in V+5, performed for 30 days under accelerated conditions, demonstrated a higher stability of sPSS with respect to sPEEK. Oxidation of the sulphide bonds to sulphone occurred, but the molecular weight of the polymeric backbone was unaffected. On the contrary, a significant decrease of sPEEK molecular weight was detected at the end of the experiment. Finally, electrochemical tests exhibited lower capacity loss after 50 cycles for sPSS as compared to Nafion and sPEEK, while coulombic efficiencies of VRFB around 95% did not undergo significant variations during the battery cycling.

Back to tab navigation

Supplementary files

Publication details

The article was received on 07 Apr 2017, accepted on 11 Aug 2017 and first published on 11 Aug 2017


Article type: Paper
DOI: 10.1039/C7TA03046K
Citation: J. Mater. Chem. A, 2017, Accepted Manuscript
  •   Request permissions

    Poly(phenylene sulfide sulfone) based membranes with improved stability for vanadium redox flow batteries

    M. Branchi, M. Gigli, B. Mecheri, D. De Porcellinis, S. Licoccia and A. D'Epifanio, J. Mater. Chem. A, 2017, Accepted Manuscript , DOI: 10.1039/C7TA03046K

Search articles by author

Spotlight

Advertisements