• R. Thermal and Water Management

• Investigate a new class of inorganic sulfide-based proton conducting membranes for hydrogen fuel cell applications. • Produce anhydrous solid membranes having minimal fuel crossover capability and address many of the problems associated with current hydrogen fuel cell technologies. • Optimize membrane materials to yield high proton conductivities (10-3 to 10-1 S/cm) in the intermediate temperature range of 125oC to 300oC. • Demonstrate performance, thermally stability, and chemical stablility to H2O and O2 in a typical fuel cell setup at operating temperatures