Filter paper derived cross-linked interconnected BaBi0.2Co0.35Fe0.45O3−δ morphology with an enhanced oxygen permeation property

Abstract

This study aims to investigate the effect of an engineered microstructure on the oxygen permeation property of a BaBi_0.2Co_0.35Fe_0.45O_3−δ (BBCF) type perovskite membrane. The interconnected multi-level cross-linked structure of the BBCF membrane has been synthesized by mimicking a common laboratory grade filter paper. The controlled calcination of the cellulose matrix results in a single phase BBCF structure when calcined at 950 °C in air. The average diameter of the interconnected BBCF fiber is about 1 μm as confirmed by FESEM. The electrical conductivity is measured to be ∼20 S cm⁻¹ at 800 °C, higher than that of other conventionally prepared BBCF based membranes. The perovskite membrane derived by exo-templating of the filter paper's cellulose fiber reveals an enhanced oxygen permeation flux of 0.98 ml min⁻¹ cm⁻² at 900 °C.