Preparation and characterization of high temperature Sr(Ce0.6Zr0.4)0.9Y0.1O3-δ/YBaCo2O5+δ mixed proton-electron composite membrane

In this study, the various Sr(Ce0.6Zr0.4)(0.9)Y0.1O3-delta/YBaCo2O5+delta (SCZY/YBCO) composite ceramic membranes were prepared by sintering at different temperatures and used as proton membranes for hydrogen permeation. SCZY and YBCO powders were prepared by the citrate-ethylenediaminetetraacetic acid sol-gel process and solid-state reaction method, respectively. The chemical reaction, structure, morphology, thermal expansion, and electrical conductivity of SCZY/YBCO were investigated through X-ray powder diffraction (XRD), scanning electron microscopy (SEM), thermal mechanical analyzer (TMA) and direct current four-probe method. The relative sintered density of SCZY/YBCO membrane sintered at 1250 degrees C was as high as 99.5%. The conductivity of the SCZY/YBCO increased with the sintering temperature. The SCZY/YBCO sample sintered at 1250 degrees C exhibited the highest conductivity of 13.44 S/cm at 800 degrees C. The H-2 permeability of the SCZY/YBCO membrane was 3.83 mL min(-1) cm(-2), much higher than that of SCZY at 800 degrees C (1.37 mL min(-1) cm(-2)). (C) 2019 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.