[O2-2]
우수논문발표상 응모자
Modulation of the Crosslinking Degree in Piperidinium-Based Anion Exchange Membranes for Efficient Water Electrolysis
발표자장현지 (숭실대학교)
연구책임자강범구 (숭실대학교)
공동저자장현지 (숭실대학교), 강범구 (숭실대학교), 박승일 (숭실대학교)
Abstract
A quaternization-based crosslinking strategy was employed using 4,4′-trimethylenebis(1-methylpiperidine), a stable crosslinker under alkaline conditions, to enhance the ion exchange capacity, suppress swelling, and improve alkaline stability. Polystyrene-b-poly(6-bromohexyl acrylate)-b-polystyrene block copolymers with polystyrene contents (30, 44, 50, and 60 wt%) were synthesized, and crosslinked membranes (CPSBHAS30, CPSBHAS44, CPSBHAS50, and CPSBHAS60) were prepared to investigate the correlation between crosslinking degree and membrane properties. CPSBHAS50 demonstrated the most balanced performance. CPSBHAS50 showed a low swelling ratio (22.6% at 80 °C), high tensile strength (17.6 MPa), and excellent alkaline stability, retaining 86.7% of its initial ionic conductivity after 720 h in 1 M KOH at 60 °C. Furthermore, it achieved a high current density of 0.926 A/cm² (1 M KOH, 60 °C, 2.0 V) and maintained stable voltage operation for 100 h at 0.2 A/cm².