CaV0.5Mo0.5x – xTixO3 – δ as a Promising Anode Material for Solid-Oxide Fuel Cells with LSGM Electrolyte

Resumo

CaV_0.5Mo_{0.5 – x}Ti_xO_{3 – δ} samples with the perovskite structure were studied as a promising anode material for fuel cells with electrolyte based on substituted lanthanum gallate La_0.88Sr_0.12Ga_0.82Mg_0.18O_2.85 (LSGM). According to X-ray diffraction data, the solid-solution homogeneity region lies from х = 0 to х = 0.25. It is shown that CaV_0.5Mo_0.25Ti_0.25O_{3 – δ} is compatible with the LSGM-based electrolytes as regards both its chemistry and the coefficient of thermal expansion. Substitution of titanium leads to a decrease in the total conductivity but extends the p(O₂) range of phase stability of this material. It is demonstrated that in its composite with LSGM this material becomes more resistant to oxidation.