抄録
The proton conductivity of the reinforced perfluorinated membrane was measured under various conditions of humidity and temperature using a four-electrode impedance method. The conductivity of the membrane was over 8×10−2 S cm−1 with 70% relative humidity at 70°C; it varied strongly with both humidity and temperature. A stable conductivity condition was observed when the relative humidity was over 20%. From the results, the activation energy was calculated to be less than 20 kJ mol−1 at any humidity. These results suggested that the Grothuss-type proton conduction might be dominant for the proton migration inside the reinforced membrane at a wide range of humidity.
