Asymmetrical thin membranes of SrCe0.95Y0.05O3−δ were prepared by a

conventional and cost-effective dry pressing method. The substrate consisted of

SrCe0.95Y0.05O3−δ, NiO and soluble starch, and the top layer was the

SrCe0.95Y0.05O3−δ. The NiO was used as a pore former and soluble starch was used

to control the shrinkage of the substrate to match that of the top layer. Crack-free

asymmetrical thin membranes with thicknesses of about 50μm and grain sizes of

5–10μm were successfully pressed on to the substrates. Hydrogen permeation

fluxes (JH2) of these thin membranes were measured under different operating

conditions. At 950C, JH2 of the 50μm SrCe0.95Y0.05O3−δ asymmetrical membrane

towards a mixture of 80% H2/He was as high as 7.6 x 10−8mol/cm2s, which was

about 7 times higher than that of the symmetrical membranes with a thickness of

about 620μm. The hydrogen permeation properties of SrCe0.95Y0.05O3−δ

asymmetrical membranes were investigated and activation energies for hydrogen

permeation fluxes were calculated. The slope of the relationship between the

hydrogen permeation fluxes and the thickness of the membranes was −0.72,

indicating that permeation in SrCe0.95Y0.05O3−δ asymmetric membranes was

controlled by both bulk diffusion and surface reaction in the range investigated.

Preparation and Hydrogen Permeation of SrCe0.95Y0.05O3−δ Asymmetrical

Membranes. S.Zhan, X.Zhu, B.Ji, W.Wang, X.Zhang, J.Wang, W.Yang, L.Lin:

Journal of Membrane Science, 2009, 340[1-2], 241-8