膜科学与技术

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Preparation and properties of B-site praseodymium doped mixed
conductor oxygen permeable membranes

Authors： LIANG Bilin, YU Qian, JIA Siqi, LI Fang, LI Qiming

Units： School of petrochemical Engineering，Liaoning Petrochemical University

KeyWords： oxygen permeable membrane; praseodymium doping; perovskite; oxygen permeability; crystal phase structure

ClassificationCode：TQ028.8

year,volume(issue):pagination： 2025,45(1):101-107

Abstract：

A series of BaPrxFe1-xO3-δ perovskite oxygen-permeable membranes with Pr doping into B-site were synthesized using a combined complexation method, which effectively optimizes the crystal structure of BaFeO3-δ parent material and demonstrates the enhanced oxygen permeability. Experimental results indicate that BaFeO3-δ parent material can transition from a hexagonal crystal structure to a cubic perovskite structure with minimal praseodymium doping, and the crystal cell volume of BaPrxFe1-xO3-δ series increases progressively with higher Pr doping content. The crystal structure, surface morphologies, oxygen permeability, and the rate-determining step of BaPrxFe1-xO3-δ were systematically compared. It can be observed that the oxygen flux of BaFeO3-δ membrane is very low at medium-low temperature, and its oxygen flux could increase rapidly to about 0.4 mL/(cm2·min) only at 950 ℃. In contrast, the medium-low oxygen permeation flux of BaPr0.05Fe0.95O3-δ can be significantly improved. For instance, its oxygen permeation flux is 0.42 mL/(cm2·min) at 850 ℃, and reach as high as 0.60 mL/(cm2·min) at 950 ℃. The oxygen permeability of BaPrxFe1-xO3-δ series exhibits a trend of increasing first and then decreasing with increasing Pr content, reaching its maximum value at x=0.1. The oxygen permeation kinetics of BaPr0.05Fe0.95O3-δ membrane (thickness of 1.0 mm) was systematically analyzed by Wagner equation, and it was found that it is controlled by bulk phase diffusion. This study provides an effective method for tuning the crystal structure and oxygen permeation performance of BaFeO3-δ by doping Pr ions.

Funds：

国家自然科学基金项目（21201096，21703091）; 辽宁省教育厅资助项目(LJKMZ20220724，JYTMS20231442)；辽宁科技厅计划指导项目（2019-ZD-0058）

AuthorIntro：

梁碧麟（2000-），女，广东湛江人，硕士生，主要从事新型无机膜材料的研究

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