Development of a Cathodic Material Based on Doped Strontium Cobaltite for Medium Temperature SOFC

Abstract

The partial substitution of tantalum for cobalt in the SrCoO_{3 – δ} structure is shown to result in suppression of the hexagonal phase formation and stabilization of the high-temperature cubic perovskite phase. Using ex situ high-temperature diffraction method, it is shown that perovskite SrCo_0.9Ta_0.1O_{3 – δ} (SCT10) does not interact with the Ce_0.8Gd_0.2O_{2 – δ} electrolyte commonly used in medium-temperature solid-oxide fuel cells. The SrCo_0.9Ta_0.1O_{3 – δ} perovskite is found to exhibit transport characteristics necessary for being used as the cathodic material in medium-temperature solid-oxide fuel cells. A voltammetric characteristic of microtubular fuel cell with the SCT cathode is shown.