Protonic and Electronic Conductivities and Hydrogen Permeation of SrCe0.95-xZrxTm0.05O3-δ(0≤x≤0.40) Membrane

Zr-substituted, Tm-doped SrCeO3 (SrCe0.95-xZrxTm0.05O3-delta, 0 <= x <= 0.40) were synthesized via citrate complexing method, and the membranes of SrCe0.95-xZrxTm0.05O3-delta were prepared by pressing followed by sintering. X-ray diffraction (XRD) was used to characterize the phase structure of sintered membrane. The microstructure of the sintered membranes was studied by scanning electron microscopy (SEM). Protonic and electronic conductivities were measured under different circumstance. Hydrogen permeation through the SrCe0.75Zr0.20Tm0.05O3-delta membranes was carried out using gas permeation setup. Hydrogen permeation fluxes (J(H2)) of the SrCe0.75Zr0.20Tm0.05O3-delta membrane reach up to 0.042 ml.min(-1).cm(-2) at H-2 partial pressure of 0.4 x 10(5) Pa at 900 degrees C. The hydrogen permeation fluxes (J(H2)) obtained in this paper are slightly lower than that of SrCe0.95Tm0.05O3-delta on the same orders, and Zr doping can increase chemical stability of the SrCe0.75Zr0.20Tm0.05O3-delta membranes.