Fabrication of BSCF-based mixed oxide ionic-electronic conducting multi-layered membrane by sequential electrophoretic deposition process

The Ba0.5Sr0.5Co0.8Fe0.2O3-delta (BSCF)-based multi-layered oxygen separation membrane was fabricated by the sequential electrophoretic deposition (EPD) process. A thin porous/dense bi-layer of BSCF was formed on a thick porous support of BSCF. The porous support prepared by a sacrificial template method using BSCF powder mixed with wheat starch (30 wt%) as a pore-forming agent, followed by uniaxial pressing and low-temperature sintering, was directly used as an EPD electrode. A thin BSCF layer was first formed on the porous support, and then a thin BSCF + PMMA (polymethyl methacrylate) layer was sequentially formed on the thin BSCF layer using a bimodal suspension of BSCF and PMMA. A 30-mu m thin porous/dense bi-layer of BSCF of which the total thickness was obtained by optimizing the processes of EPD and subsequent co-sintering. The oxygen separation performance of 3.7 ml (STP) min(-1) cm(-2) at 860 degrees C was achieved for the BSCF-based multi-layered oxygen separation membrane.

Automated summary

The multi-layered oxygen separation membrane based on BSCF was fabricated using sequential EPD process, with a structure of thin porous/dense bi-layer of BSCF. By optimizing the processes, a high oxygen separation performance of 3.7 ml (STP) min(-1) cm(-2) at 860 degrees C was achieved for this membrane.