Thermal properties of Nafion-TiO2 composite electrolytes for PEM fuel cell

Thermal analysis has been used to evaluate the stability, glass transition, and water retention of Nafion based polymer-ceramic electrolytes. These electrolytes are envisioned as promising replacement of Nafion in fuel cells operating above 100 A degrees C. The polymeric matrix prepared by casting exhibits lower crystallinity than the extruded Nafion, a feature that affects the water absorption properties. The addition of titania-based nanotubes and nanoparticles to the polymer has enhanced the water retention at high temperatures (similar to 130 A degrees C) and the glass transition temperature, respectively. Such results are important for the design of composite electrolytes for the operation of fuel cells at high temperatures.