(156e) Studies of Ba0.5Sr0.5Co0.8Fe0.2Ox Asymmetric Membranes

Mixed ionic-electronic conductive (O-MIEC) membranes are receiving an increasing attention as a promising material for the pure oxygen production and catalytic reactor due to their infinite theoretical oxygen separation factor and staged addition of oxygen at higher temperatures. However, many O-MIEC membranes are still suffering low fluxes. Compared to other O-MIEC materials, Ba0.5Sr0.5Co0.8Fe0.2Ox (BSCF) exhibits a promising oxygen permeability. Our previous study has showed that bulk diffusion is the dominant step for the oxygen transportation through thick BSCF membrane. According to this conclusion, a BSCF asymmetric membrane containing a thin dense layer supported on a porous substrate was successfully prepared using a simple pressing method. The oxygen permeation testing showed that the asymmetric geometry enhanced the oxygen transportation through BSCF membrane. The stability of BSCF asymmetric membranes have been studied under reaction conditions. In addition, the hollow fiber BSCF membranes prepared by a phase inversion spinning and sintering method have been investigated. Specifically, the effect of a dissociation catalyst on the oxygen flux has been explored.