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A tunable, meta-linked aryl ether polymer scaffold enables the introduction of various acid groups for a fundamental comparison of their contributions to proton conduction. Sulfonic acid-functionalized polymers offer the best proton conduction at low temperature and high relative humidity, while phosphonic acid-functionalized polymers outperform sulfonic and carboxylic acid-derived polymers at high temperature or low humidity.
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Hudson et al. (2019) studied this question.
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