High oxide-ion conductivity through the interstitial oxygen site in Ba₇Nb₄MoO₂₀-based hexagonal perovskite related oxides.

ABSTRACT: Oxide-ion conductors are important in various applications such as solid-oxide fuel cells. Although zirconia-based materials are widely utilized, there remains a strong motivation to discover electrolyte materials with higher conductivity that lowers the working temperature of fuel cells, reducing cost. Oxide-ion conductors with hexagonal perovskite related structures are rare. Herein, we report oxide-ion conductors based on a hexagonal perovskite-related oxide Ba₇Nb₄MoO₂₀. Ba₇Nb_3.9Mo_1.1O_20.05 shows a wide stability range and predominantly oxide-ion conduction in an oxygen partial pressure range from 2 × 10^-26 to 1 atm at 600 °C. Surprisingly, bulk conductivity of Ba₇Nb_3.9Mo_1.

SUBMITTER: Yashima M 

PROVIDER: S-EPMC7835212 | biostudies-literature | 2021 Jan

REPOSITORIES: biostudies-literature