Abstract
Bicontinuous hydrophilic/hydrophobic nanochannels is extremely important for efficient ions transportation and mechanical robustness for anion exchange membranes (AEMs), whereas precise regulation over micromorphology remains a big challenge. Herein, we designed and prepared fluorinated block AEMs via visible-light induced reversible addition-fragmentation chain transfer polymerization (Vis-RAFT) catalyzed by ppm amount of photocatalyst at room temperature. By controlled installation of hydrophobic fluorine within rigid segments and hydrophilic charged groups within flexible segments, the discrimination between two segments increases, yielding a distinguished microphase separated morphology with bicontinuous nanochannels. Consequently, higher hydroxide conductivity (σOH), stronger alkaline stability, as well as largely depressed linear swelling ratio (LSR) of membrane PPiMA-b-PFSt-0.63 (σOH = 62.77 mS cm−1, LSR = 13.39 % at 80 °C) compared with the non-fluorinated counterpart PSt-b-PPiMA-0.66 (σOH = 47.04 mS cm−1, LSR = 48.35 % at 80 °C) was achieved. A H2/O2 anion exchange membrane fuel cell assembled with membrane PPiMA-b-PFSt-1.32 displayed a maximum power density of 629.6 mW cm−2 at 80 °C. Overall, we demonstrates an effective strategy in precise control over micromorphology, and provides meaningful insights into the structure-morphology-property relationship for high-performance AEMs.
Published Version
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