Abstract
A CO2-stable, easily sintered proton-conducting oxide electrolytes based on solid solution Ba7In6Al2–xZnxO19-0.5x with hexagonal structure has been synthesized for the first time. Within the homogeneity region (0 ≤ x ≤ 0.10), there is an increase in unit cell parameters, cell volumes and free cell volumes. The addition of Zn2+ markedly improved the sinterability of the material. The relative density of the ceramics of the doped samples reached 95 % at lower sintering temperatures than the parent phase. The electrical conductivity was studied using electrochemical impedance spectroscopy. Upon doping the oxygen-ion conductivity increased by 0.25 orders of magnitude at 800 °C. Proton transport was predominant below 500 °C for a wet atmosphere (pH2O = 1.92·10−2 atm). The investigated phases Ba7In6Al2–xZnxO19-0.5x are capable of hydration and incorporate up to 1.45 mol H2O vs 0.41 mol H2O for the parent phase. The studied phases exhibit chemical resistance to CO2 under heat treatment at 600 °C. It was shown that solid solution Ba7In6Al2–xZnxO19-0.5x is a promising electrolyte material for intermediate-temperature fuel cells.
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