3-Methyltrimethylammonium poly(2,6-dimethyl-1,4-phenylene oxide)\ud based anion exchange membrane for alkaline polymer electrolyte\ud fuel cells

摘要

Hydroxyl ion (OH–) conducting anion exchange membranes based on modified poly (phenylene\udoxide) are fabricated for their application in alkaline polymer electrolyte fuel cells (APEFCs). In the present\udstudy, chloromethylation of poly(phenylene oxide) (PPO) is performed by aryl substitution rather than benzyl\udsubstitution and homogeneously quaternized to form an anion exchange membrane (AEM). 1H NMR and FT–\udIR studies reveal successful incorporation of the above groups in the polymer backbone. The membrane is\udcharacterized for its ion exchange capacity and water uptake. The membrane formed by these processes show\udgood ionic conductivity and when used in fuel cell exhibited an enhanced performance in comparison with the\udstate-of-the-art commercial AHA membrane. A peak power density of 111 mW/cm2 at a load current density\udof 250 mA/cm2 is obtained for PPO based membrane in APEFCs at 30 °C.