Proton-conducting SrCe0.9Ho0.1O3-α ceramics was prepared by high-temperature solid state reaction. X-ray powder diffraction patterns show that the ceramics is of a single orthorhombic phase of perovskite-type SrCe03....Proton-conducting SrCe0.9Ho0.1O3-α ceramics was prepared by high-temperature solid state reaction. X-ray powder diffraction patterns show that the ceramics is of a single orthorhombic phase of perovskite-type SrCe03. Using the ceramics as solid electrolyte and porous platinum as electrodes, the protonic conduction in the ceramics was investigated by using ac impedance spectroscopy and gas concentration cell methods in the temperature range of 600 ~ 1000 ℃.展开更多
The carbonate precursors with different shapes and sizes were prepared by means of coprecipitation with cerium nitrate as the starting salts, ammonium carbonate as the precipitator and citric acid as the complexing ag...The carbonate precursors with different shapes and sizes were prepared by means of coprecipitation with cerium nitrate as the starting salts, ammonium carbonate as the precipitator and citric acid as the complexing agent and dispersant. Precursors and calcined powders were characterized using TEM, TGA and XRD. The results indicate that the morphology of precursors changes from nanowires to spherical particles with the increase of citric acid. The calcined CeO2 nanoparticle inherits obviously the morphology of precursors. The as-prepared CeO2 has the cubic crystal structure of fluorite, and the crystalline degree of samples increases with the roasting temperature.展开更多
文摘Proton-conducting SrCe0.9Ho0.1O3-α ceramics was prepared by high-temperature solid state reaction. X-ray powder diffraction patterns show that the ceramics is of a single orthorhombic phase of perovskite-type SrCe03. Using the ceramics as solid electrolyte and porous platinum as electrodes, the protonic conduction in the ceramics was investigated by using ac impedance spectroscopy and gas concentration cell methods in the temperature range of 600 ~ 1000 ℃.
文摘The carbonate precursors with different shapes and sizes were prepared by means of coprecipitation with cerium nitrate as the starting salts, ammonium carbonate as the precipitator and citric acid as the complexing agent and dispersant. Precursors and calcined powders were characterized using TEM, TGA and XRD. The results indicate that the morphology of precursors changes from nanowires to spherical particles with the increase of citric acid. The calcined CeO2 nanoparticle inherits obviously the morphology of precursors. The as-prepared CeO2 has the cubic crystal structure of fluorite, and the crystalline degree of samples increases with the roasting temperature.
