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−δ perovskite is introduced, Ba0.95La0.05Co0.8Fe0.12Nb0.08O3−δ (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 (DO = 5.8 × 10−6 cm2 s−1, kO = 1.0 × 10−4 cm s−1, σion = 0.93 S cm−1 at 900 °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 °C. By presenting a material that demonstrates higher performance than Ba0.5Sr0.5Co0.8Fe0.2O3−δ (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.