Newly developed aromatic electrolytic membrane delivers improved hydrogen ion conductivity even at extremely low temperatures

Whereas conventional fuel cells use fluorine electrolytic membranes, the Honda FC Stack employs a newly developed aromatic electrolytic membrane. This electrolytic membrane has been redesigned down to its molecular structure, combining main chains containing a highly stable aromatic structure with an ion exchange substrate (SO3¯). This permits a major increase in ion-conducting substrate over that of a conventional fluorine electrolytic membrane, while exhibiting lower depletion. By increasing the ion exchange substrate, low-temperature hydrogen ion conductivity is increased twofold over that of a fluorine electrolytic membrane. As a result, membrane resistance can be reduced by around half and outstanding conductivity obtained even at sub-zero temperatures, to achieve operation at temperatures as low as –20°C.

Comparison of electrolytic membrane structures


The aromatic electrolytic membrane contains more of the ion exchange substrate than the fluorine
electrolytic membrane, resulting in lower membrane resistance over a broad temperature range.

*Honda stack installed in FCX-V3


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