Preparation of Dense Thin-Flm Solid Electrolyte on Novel Porous Structure with Parallel Pore Channel

A porous La0.6Sr0.4Co0.2Fe0.8O3-Ce0.9Gd0.1O1.95 (LSCF-CGO) green body was prepared from a water-based slurry by a freeze-drying process. The LSCF-CGO slurry was frozen, controlling the growth direction of ice, and it was sublimated at a reduced pressure. After sintering the green body at 1350°C, the obtained porous substrate has macroscopically aligned open pores parallel to the ice growth direction, and micro pores on their surfaces. It was found that a porous body with such a unique pore structure is the most suitable for integrating a thin film with a porous substrate. A bi-layer consisting of a dense thin-film of CGO on the porous LSCF-CGO substrate has been then fabricated using a slurry-coating process.