Polybenzimidazole composite membranes containing imidazole functionalized graphene oxide showing high proton conductivity and improved physicochemical properties
발표자
()
초록
내용
Thermally cross-linked membranes were created for applications in vanadium redox flow batteries (VRFB) by employing sulfonated poly(ether ether ketone) (SPEEK) as the polymer matrix and poly(2,5-benzimidazole)-grafted graphene oxide (ABPBI-GO) as a reinforcing agent. The resultant thermally cross-linked composite membranes exhibited significantly enhanced chemical and mechanical stability, attributed to the cross-linked structures and the acid-base interactions established between the benzimidazole groups in the filler and the sulfonic acid groups in the polymer chain. The incorporation of ABPBI-GO within the polymer matrix concurrently decreased the permeability of vanadium ions while retaining high proton conductivity, yielding a high-performance membrane for VRFBs. Remarkably, the TC-SPEEK/0.5 membrane (containing 0.5 wt% of ABPBI-GO) showcased an ionic selectivity eight times higher than Nafion 212, consequently leading to improved coulombic efficiencies, voltage efficiencies, and energy efficiencies.