Abstract
A wet chemistry route to produce barium zirconate BaZrxY1-xO3- d (BZY) and barium cerium zirconate BaCe1-x-zZrxYzO3-d (BCZY) with controlled chemical structure and microstructural properties was optimized. A single phase was obtained at temperatures as low as 1100{degree sign}C for BZY and 1200 {degree sign}C for BCZY. To verify their chemical stability, all the calcined oxides were exposed to CO2 and the phase composition of the resulting specimens was investigated using X-ray diffraction (XRD) analysis. Dense electrolytes were obtained sintering BZY and BCZY pellets at 1600{degree sign}C for 10 hours, as shown from field emission scanning electron microscopy (FE-SEM) images. To compare the cell performance of the different oxides, fuel cell polarization curves on symmetric (Pt/BZY/Pt and Pt/BCZY/Pt) cells were measured at 700{degree sign}C.
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