Abstract
Novel and highly durable alkaline anion-exchange membranes, PVA/PDDA–OH−, are synthesized using a combined thermal and chemical cross-linking method. In the synthesis, poly(vinyl alcohol) (PVA) is used as polymer matrix and poly(diallyldimethylammonium chloride) (PDDA) as anion charge carriers. The resulting membrane exhibits a high hydroxide conductivity of 0.025 S cm−1 at a polymer composition PVA/PDDA being 1:0.5 by mass. A promising H2/O2 fuel cell peak power density of 32.7 mW cm−2 is reached for MEA fabricated with this PVA/PDDA–OH− at 25 °C. The membrane also shows a strong alkaline stability in 8 M KOH at 80 °C for 360 h. This is considered a new record for the fully cation-free hydrocarbon membranes for the use in alkaline fuel cell, seeing that PVA/PDDA–OH− is made simply of aliphatic skeletons.
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