Preparation And Property Of Functional Graphene/SPPEK Composite Proton Exchange Membranes

Proton exchange membranes fuel cell（PEMFC）is the most proven fuel cell technique and has been applied in many fields nowadays.However,due to its expensive cost,PEMFC is limited for being widely used.Hence,it is the tendency for this domain to substitute the novel low-cost heat resisting sulfonated polyaryletherketone proton exchange membrane material for expensive,poor heat resisting and low fuel barrier property perfluorosulfonate membrane such as Nafion.What’s more,the inorganic mixed sulfonated polyaryletherketone proton exchange membrane material with unique nano-structure,which improved proton conductivity and oxidative stability,has arouse much more concern.In this work,sulfonated graphene oxide（SSiGO）and Quaternary ammoniated graphene oxide（QGO）were prepared to be mixed in sulfonated Poly（phthalazinone ether ketone）（PPEK）.The SSiGO-SPPEK,QGO-SPPEK and bi-component SSiGO/QGO-SPPEK composite proton exchange membranes with different content were prepared and tested.The proton conductivity of 10% SSiGO content composite membranes was 0.094S/cm at 30℃,and 0.220S/cm at 80℃,and the membranes,without any quality loss at 170℃,processed the favourable thermal stability.The ionic crosslinking 10%QGO-SPPEK composite membranes were immersed in Feton’s reagent（4ppm FeSO₄,3% H₂O₂）at 60℃ for over 12 hours without any fragmentation,which proved the membranes excellent oxidative stability.However,the crosslinking between the sulfonic acid groups in SPPEK and quaternary ammonium groups in QGO limited the proton conductivity of the membranes partly.In order to improved the comprehensive performance of the membranes,bi-component SSiGO/QGO-SPPEK composite proton exchange membranes were prepared.The proton conductivity of 8% SSiGO/QGO-SPPEK was 0.046S/cm at 30℃,and 0.080S/cm at 80℃ and in the meanwhile,the endurance time of the membranes in in Feton’s reagent at 60℃ were over 11.5 hours,which indicated the bi-component SSiGO/QGO-SPPEK membranes process the excellent oxidative stability and superior proton conductivity at the same time.It indicates the high-performance of SSiGO/QGO-SPPEK composite membranes for proton exchange membranes fuel cells.