Intermediate temperature electrochemical properties of Yb3+ doped SrCeO3- carbonate and chloride composite electrolytes

Abstract

In this work, novel SrCe0.9Yb0.1O3-α-(Li/Na)2CO3 (SCYb-LN) and SrCe0.9Yb0.1O3-α-LiCl-SrCl2 (SCYb-LS) electrolyte composites were successfully fabricated at low temperature. The SEM image results show that the composites possess sufficient density. The highest conductivity is observed to be 3.5×10-2 and 1.2 × 10-1 S·cm-1 for SCYb-LS, SCYb-LN at 600 °C, respectively. In a hydrogen-containing atmosphere, the composites are almost pure ionic conductors, according to the log σ ~ log (pO2) plots results. Using SCYb-LN and SCYb-LS as electrolytes, the H2/O2 fuel cells produce the maximum power densities of 294 and 147 mW·cm-2 at 600 °C, correspondingly.