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

[EN] 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. H.B. and G.D.N. contributed equally to this work. This work was supported by Korea Electric Power Corporation (grant no. R18XA06-77), National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (grant no. 2018R1A5A1025224), and National Research Foundation of Korea (NRF) grant funded by the Korea government (MSIT) (grant no. 2022R1A2B5B02001873). Bae, H.; Nam, GD.; Namgung, Y.; Park, K.; Park, J.; Serra Alfaro, JM.; Joo, JH... (2024). Exceptional High-Performance Oxygen Transport Membrane and Comprehensive Study on Mass/Charge Transport Properties. SMALL STRUCTURES. https://doi.org/10.1002/sstr.202400095