Sulfonated graphene oxide/sulfonated poly (2,6‐ dimethyl – 1,4‐phenylene oxide) as a potential proton exchange membrane for iron air flow battery application

A series of proton exchange membranes (PEMs) sulfonated poly(2,6-dimethyl-1,4-phenylene oxide) (SPPO) with different graphene oxide (SGO) (0, 0.25, 0.5, 0.75, 1.0, 1.5%) were prepared for possible application in Iron-air/flow battery. The presence SGO the membrane improved water uptake all and decreased swelling ratio. SPPO/1% w/w showed good properties higher 44.1%, retention 42.48% ratio 21.4% at 25°C. However, 0.75% exhibited highest conductivity 0.98 S/cm better dispersion, elemental distribution, morphology. In addition, thermal stability composite membranes. chemical remained after 7 days a 1 M HCL solution. SPPO/0.75%w/w increased when degradation evaluated. Compared to Nafion 117, composites lower iron crossover. had high permeability 3.03 × 10−7 cm−2/s, which is 75% than 7.6 10−8 cm−2/s SPPO/SGO-1.5% 52% 1.46 SPPO/SGO-0.75%. results indicate that inorganic filler stable enough an iron-air/flow