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Klumpen, Christoph ; Gödrich, Sebastian ; Papastavrou, Georg ; Senker, Jürgen:
Water mediated proton conduction in a sulfonated microporous organic polymer.
In: Chemical Communications.
Bd. 53
(2017)
Heft 54
.
- S. 7592-7595.
ISSN 1364-548X
DOI: https://doi.org/10.1039/C7CC02117H
Abstract
Polymer membranes (PEMs) within fuel cells (FCs) act as separators and efficient proton conducting electrolytes. Established systems tend to microphase separation into hydrophilic and hydrophobic regions{,} making these materials prone to water loss at elevated temperatures. Therefore{,} recent approaches utilize porous materials{,} which promise stronger interactions between water molecules and the framework{,} while still providing efficient conductive pathways. Here we show{,} that the microporous polymer PAF-1 exhibits proton conductivities up to 10-1 S cm-1 under hydrous conditions{,} after post-synthetic sulfonation. Gas phase sulfonation turned out to be the essential step for introducing a sufficiently large amount of -SO3H groups and thus a high charge carrier concentration upon hydration. While the absolute conductivity of the sulfonated frameworks strongly depends on the water uptake{,} we found similar activation barriers for all relative humidities. Since water is homogeneously stored in micro- and mesoporous voids{,} the activation barrier of the interpore conductivity is decisive for the macroscopic properties.