Xu Z, Yu J, Wang W. Zirconium and Yttrium Co-Doped BaCo
0.8Zr
0.1Y
0.1O
3-δ: A New Mixed-Conducting Perovskite Oxide-Based Membrane for Efficient and Stable Oxygen Permeation.
MEMBRANES 2022;
12:831. [PMID:
36135850 PMCID:
PMC9501606 DOI:
10.3390/membranes12090831]
[Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 08/12/2022] [Revised: 08/21/2022] [Accepted: 08/23/2022] [Indexed: 06/16/2023]
Abstract
Oxygen permeation membranes (OPMs) are regarded as promising technology for pure oxygen production. Among various materials for OPMs, perovskite oxides with mixed electron and oxygen-ion (e-/O2-) conducting capability have attracted particular interest because of the high O2- conductivity and structural/compositional flexibility. However, BaCoO3-δ-based perovskites as one of the most investigated OPMs suffer from low oxygen permeation rate and inferior structural stability in CO2-containing atmospheres. Herein, zirconium and yttrium co-doped BaCoO3-δ (BaCo1-2xZrxYxO3-δ, x = 0, 0.05, 0.1 and 0.15) are designed and developed for efficient and stable OPMs by stabilizing the crystal structure of BaCoO3-δ. With the increased Zr/Y co-doping content, the crystal structural stability of doped BaCoO3-δ is much improved although the oxygen permeation flux is slightly reduced. After optimizing the co-doping amount, BaCo0.8Zr0.1Y0.1O3-δ displays both a high rate and superior durability for oxygen permeation due to the well-balanced grain size, oxygen-ion mobility, crystal structural stability, oxygen vacancy concentration and surface exchange/bulk diffusion capability. Consequently, the BaCo0.8Zr0.1Y0.1O3-δ membrane delivers a high oxygen permeation rate of 1.3 mL min-1 cm-2 and relatively stable operation at 800 ∘C for 100 h. This work presents a promising co-doping strategy to boost the performance of perovskite-based OPMs, which can promote the industrial application of OPM technology.
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