PTFE-Based Solid Polymer Electrolyte Membrane for High-Temperature Fuel Cell Applications

摘要: The demand for a solid polymer electrolyte membrane fuel-cell systems, capable of withstanding temperatures above 130°C, has prompted this study. A low-cost, highly conductive, nanoporous proton-conducting membrane, based on polytetrafluoroethylene (PTFE) backbone been developed. It comprises nonconductive nano-size ceramic powder, PTFE matrix, and an aqueous acid. Impregnation the powder into matrix was carried out using sol-gel synthesis. preparation procedures were studied characterized. This demonstrated promising properties high thermal stability (up to 300°C), pressure-retention difference up 2.2 bars, room-temperature conductivity 0.11 S cm -1 (10-15% (w/w) SiO 2 , 3 M H SO 4 ), hydrophilic/hydrophobic pore ratio 1:1 very water flow at low pressure. nonoptimized direct-methanol fuel cell with 137 μm thick assembled tested. produced 133 mW -2 80°C, 0.05 bars (g) dry air, 1.9 stoich (air), 198 110°C, (air).