[3PS-016]
Design of ether-free poly(biphenyl alkylene piperidinium) anion exchange membrane with alkyl spacer for efficient water electrolysis
발표자TO THI CAM THACH (Sungkyunkwan University)
연구책임자김덕준 (성균관대학교)
Abstract
A series of ether-free anion exchange membranes (PBAPip-n-OH) was synthesized by quaternizing poly(biphenyl alkylene) backbones with piperidinium groups tethered via linear alkyl spacers. The flexible spacers promote nanoscale phase separation, forming continuous ion transport pathways within a mechanically stable hydrophobic matrix. Localized mobility of piperidinium end groups enhances hydroxide conductivity while suppressing chemical degradation. Among them, PBAPip-6-OH showed the best performance, with 65.14 mS cm⁻¹ conductivity and 67.6 MPa tensile strength at 30 °C. The membrane retained over 95% of its weight after 720 h in 1 M KOH. In water electrolysis, it reached 2.8 A cm⁻² at 2.0 V and 60 °C. These results demonstrate that side-chain engineering on ether-free backbones is a promising strategy for durable and high-performance AEMs in electrochemical applications.