“…Meanwhile the wellknown drawbacks of Nafion have motivated researchers to develop candidate PEMs to alternate Nafion. PEMs such as sulfonated poly(phenylene)s [2], poly(arylene ether ketone)s [3e5], poly(arylene ether)s [6,7], polymides [8,9], sulfonated PBT [10] and PBI [11], sulfonated poly(-phenylsulfone) (SPPSU) [12e15] have been developed. Although SPPSU have high thermal stability, excellent mechanical strength, and strong resistance to membrane decomposition in acidic water media, the drawbacks such as high water uptake, large dimensional change, and poor proton conductivity at dehumidified conditions are still need to be improved.…”