Properties of BaCe1-xTixO3 materials for hydrogen electrochemical separators

BaCe1-xTixO3 (x = 0-0.3) powders were synthesised by solid state reaction and sintered at 1200 C. The materials were then ground, isostatically pressed and sintered in air at 1500 C for 24 h. Ti enhanced the sinterability and densification. The solubility limit was approximately 20 at%. Total and partial electrical conductivity was determined by DC four-probe measurements and EMF measurements of solid state electrochemical cells in controlled atmospheres (H2, O2 and H2O) at 500-800 C. Doping decreased the electrical conductivity by about an order of magnitude, and promoted a change from ionic to electronic conductivity. The doped material was considered a candidate material for the manufacture of membranes to separate H2 and CO2 in the production of hydrogen. 14 refs.