Abstract
Imidazole rings were grafted on alkoxysilane with a simple nucleophilic substitute reaction to form hybrid inorganic–organic polymers with imidazole rings. Proton exchange membranes (PEM) based on these hybrid inorganic–organic polymers and H 3PO 4 exhibit high proton conductivity and high thermal stability in an atmosphere of low relative humidity. The grafted imidazole rings improved the proton conductivity of the membranes in the high temperature range. It is found that the proton conductivities increase with H 3PO 4 content and temperature, reaching 3.2 × 10 −3 S/cm at 110 °C in a dry atmosphere for a membrane with 1 mole of imidazole ring and 7 moles of H 3PO 4. The proton conductivity increases with relative humidity (RH) as well, reaching 4.3 × 10 −2 S/cm at 110 °C when the RH is increased to about 20%. Thermogravimetric analysis (TGA) indicates that these membranes are thermally stable up to 250 °C in dry air, implying that they have a good potential to be used as the membranes for high-temperature PEM fuel cells.
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