Synthesis, ionic conductivity, and thermal properties of proton conducting polymer electrolyte for high temperature fuel cell

• Published in: Solid state ionics Vol. 177; no. 1; pp. 185 - 189
• Main Authors: Itoh, Takahito, Hamaguchi, Yohei, Uno, Takahiro, Kubo, Masataka, Aihara, Yuichi, Sonai, Atsuo
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 16.01.2006
• Subjects: Fuel cells; Hyperbranched polymer; Ion exchange; Ionic conduction; Polymer electrolyte membrane; Sulfonic acid groups; Thermal properties; Polymer electrolyte membrane; Ionic conduction; Thermal properties; Hyperbranched polymer; Sulfonic acid groups; Fuel cells; Ion exchange
• ISSN: 0167-2738; 1872-7689
• DOI: 10.1016/j.ssi.2005.10.006

Hyperbranched polymer (poly-1a) with sulfonic acid groups at the end of chains was successfully synthesized. Interpenetration reaction of poly-1a with a hyperbranched polymer with acryloyl groups at the end of chains (poly-1b) as a cross-linker afforded a tough electrolyte membrane. The poly-1a and the resulting electrolyte membrane showed the ionic conductivities of 7 × 10 − 4 and 8 × 10 − 5 S/cm, respectively, at 150 °C under dry condition. The ionic conductivities of the poly-1a and the electrolyte membrane exhibited the VTF type temperature dependence. And also, both poly-1a and the resulting electrolyte membrane were thermally stable up to 200 °C.