Investigation of Co–doped Ce_0.8Sm_0.2O_2–δ–Ba_0.95La_0.05Zr_0.1Fe_0.9–xCo_xO_3–δ Dual–phase Oxygen Transport Membranes

¹ School of Materials Science and Engineering, Shanghai University, Shanghai 200072 China
² State Key Laboratory of Advanced Special Steel, Shanghai University, Shanghai 200072, China

^a pengfeiwang.sh@foxmail.com
^b hwcheng@shu.edu.cn
^c luxg@shu.edu.cn
^* Corresponding author: Hongwei Cheng, Xionggang Lu

Abstract

In this study, 60 wt% Ce_0.8Sm_0.2O_2–δ–Ba_0.95La_0.05Zr_0.1Fe_0.9–xCo_xO_3–δ (SDC–BLZFC, x = 0–0.4) dual–phase oxygen transport membranes were prepared by a combined EDTA–citrate complexing sol–gol method. The effects of partial substitution of iron by cobalt on the crystal structure, phase structural stability, oxygen permeation flux and CO₂–tolerance were systematically investigated by XRD, TG and oxygen permeation experiment. The sample with x = 0.4 had the highest oxygen permeation flux of 0.42 ml min^-1 cm^-2 in He, while decreased most sharply after switching into pure CO₂. The result of sample with x = 0 was opposite. From all results, it could indicate that Co–doping contributes to oxygen permeation flux in inert gases and phase structural stability, but would reduce the CO₂–tolerance of SDC–BLZFC dual–phase membranes.