BaZr_xY_(1-x)O_(3-δ) and BaCe_(1-x-z)Zr_xY_zO_(3-δ) Proton Conductors For Intermediate Temperature Solid Oxide Fuel Cells (IT-SOFCs)

摘要

A wet chemistry route to produce barium zirconate BaZr_xY_(1-x)O_(3-δ) (BZY) and barium cerium zirconate BaCe_(1-x-z)Zr_xY_zO_(3-δ) (BCZY) with controlled chemical structure and microstructural properties was optimized. A single phase was obtained at temperatures as low as 1100℃ for BZY and 1200℃ for BCZY. To verify their chemical stability, all the calcined oxides were exposed to CO_2 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℃ 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℃.