Preparation, Characterization and Intermediate-Temperature Electrochemical Properties of Er3+-Doped Barium Cerate-Sulphate Composite Electrolyte

Materials (Basel). 2019 Aug 27;12(17):2752. doi: 10.3390/ma12172752.

Abstract

In this study, BaCe0.9Er0.1O3-α was synthesized by a microemulsion method. Then, a BaCe0.9Er0.1O3-α-K2SO4-BaSO4 composite electrolyte was obtained by compounding it with a K2SO4-Li2SO4 solid solution. BaCe0.9Er0.1O3-α and BaCe0.9Er0.1O3-α-K2SO4-BaSO4 were characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM) and Raman spectrometry. AC impedance spectroscopy was measured in a nitrogen atmosphere at 400-700 °C. The logσ~log (pO2) curves and fuel cell performances of BaCe0.9Er0.1O3-α and BaCe0.9Er0.1O3-α-K2SO4-BaSO4 were tested at 700 °C. The maximum output power density of BaCe0.9Er0.1O3-α-K2SO4-BaSO4 was 115.9 mW·cm-2 at 700 °C, which is ten times higher than that of BaCe0.9Er0.1O3-α.

Keywords: BaCeO3; composite; conductivity; electrolyte; fuel cell.