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

Small Structures Pub Date : 2024-06-03 DOI:10.1002/sstr.202400095

Hohan Bae, Gyeong Duk Nam, Yeon Namgung, Kwangho Park, Jun-Young Park, José M. Serra, Jong Hoon Joo, Sun-Ju Song

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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 BaCoO_3−δ perovskite is introduced, Ba_0.95La_0.05Co_0.8Fe_0.12Nb_0.08O_3−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 (D_O = 5.8 × 10⁻⁶ cm² s⁻¹, k_O = 1.0 × 10⁻⁴ cm s⁻¹, σ_ion = 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 Ba_0.5Sr_0.5Co_0.8Fe_0.2O_3−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.

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卓越的高性能氧气传输膜和有关质量/电荷传输特性的综合研究

本研究的重点是用于高效供氧的混合导电包晶膜，旨在用一种更实用的替代品取代高能耗的低温蒸馏。本文介绍了一种镧和铌共掺杂的 BaCoO3-δ 包晶石--Ba0.95La0.05Co0.8Fe0.12Nb0.08O3-δ（BLCFN），其氧气渗透通量打破了记录，超过了所有已知的单相包晶石膜。为了阐明其卓越的膜性能，我们对其质量/电荷传输特性和平衡体积特性进行了研究，定量指标（DO = 5.8 × 10-6 cm2 s-1，kO = 1.0 × 10-4 cm s-1，σion = 0.93 S cm-1，900 °C）显示了快速扩散和出色的表面气体交换动力学。在 900 °C 的空气/He 环境中，氧气渗透率达到 12.4 mL cm-2 min-1，长期稳定性超过 200 小时。通过展示一种比目前以最高渗透性著称的 Ba0.5Sr0.5Co0.8Fe0.2O3-δ (BSCF) 性能更高的材料，相信这标志着向创新性地提高基于过氧化物的膜的性能迈出了重要一步。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Small Structures

CiteScore

17.30

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