Optimization of Al2O3-glass composite seals for planar intermediate-temperature solid oxide fuel cells

► Al2O3-HGS composite seals were prepared by tape-casting. ► Leakage was tested at various temperatures, N2 pressures and compressive loads. ► Thermal cycle sealing performance of AG50 was evaluated between 200 and 750 °C. ► Single cell was tested at 750 °C with H2 fuel, air oxidant and AG50 seal.