Exceptional High‐Performance Oxygen Transport Membrane and Comprehensive Study on Mass/Charge Transport Properties

Abstract

This study focuses on mixed-conducting perovskite membranes for efficient oxygen supply, aiming to replace energy-intensive cryogenic distillation with a more practical alternative. A La and Nb co-doped BaCoO3-delta perovskite is introduced, Ba0.95La0.05Co0.8Fe0.12Nb0.08O3-delta (BLCFN) with a record-breaking oxygen permeation flux, surpassing all known single-phase perovskite membranes. To elucidate its superior membrane performance, the mass/charge transport properties and equilibrium bulk properties are investigated and quantitative indicators (D-O = 5.8 x 10(-6) cm(2) s(-1), k(O) = 1.0 x 10(-4) cm s(-1), sigma(ion) = 0.93 S cm(-1) at 900 degrees C) reveal fast diffusion and excellent surface gas-exchange kinetics. The oxygen permeability of 12.4 mL cm(-2) min(-1) and over 200 h of long-term stability is achieved in an air/He atmosphere at 900 degrees C. By presenting a material that demonstrates higher performance than Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF), currently known for its highest permeability, it is believed that this marks a significant step toward innovative performance enhancement of perovskite oxide-based membranes.