Study on the Electrolyte material BaCe_(1-x)Y_xO_(3-σ)'s Raman Spectra and Electrical Properties for Intermediate-temperature Solid Oxide Fuel Cells

摘要

In this paper we used sol-gel method for synthesizing Y~(3+)-doped BaCe03 solid electrolyte BaCe_(1-x)Y_xO_(3-σ)(x=0.10, 0.15, 0.20, 0.25, 0.30). The samples crystallized in a single perovskite phase by X-ray diffraction analysis after sintering at 1450°C in air for 10h; Raman spectrum measurements indicated that the increasing of Y~(3+) doped content increased the crystal symmetry and increased the oxygen vacancy content for the samples, all Y~(3+) ions were doped into the Ce-sites; The electric conductivities of the samples increased with Y content and reach a maximum at x=0.25, then decreased. The relationship between proton conductivity and Y dopant was closely related with oxygen vacancy content, crystal symmetry and the forming of defect association.