Oxygen Transport in Microtubular Membranes La0.5Sr0.5Fe1 – xNbxO3 – δ

Abstract

Perovskite-like oxides based on lanthanum–strontium ferrites are considered to be promising electrode materials for use in various types of fuel cells, and the strategy of modifying these materials by partial substitution of iron with highly charged ferroactive cations has proved to be an efficient way to increase their chemical stability. In this work, the results of a study of the permeability of microtubular oxygen membranes based on La_0.5Sr_0.5Fe_{1 – x}Nb_xO_{3 – δ} are presented for the first time. The activation energy of oxide bulk diffusion was found (20 ± 4 kJ/mol).