Electrochemical Performance and Chemical Stability of Architecturally Designed La_(2-x) Pr_xNiO_(4+δ) IT-SOFC Cathodes

摘要

In this work, La_(2-x)Pr_xNiO_(4+δ) (with x=0.0, 0.5, 1 and 2) films have been prepared and studied with the aim of determining the best compromise between stability and electrochemical properties. Indeed La_2NiO_(4+δ) is known to exhibit a higher chemical stability while Pr_2NiO_(4+δ) presents better electrochemical properties. The properties of mixed phases were found intermediate between those of Pr_2NiO_(4+δ) and La_2NiO_(4+δ). The chemical stability decreases by increasing the Pr content. Furthermore, novel double layer La_(2-x)Pr_xNiO_(4+δ) cathodes were designed by electrostatic spray deposition followed by screen-printing. The polarization resistance (R_(pol)) of a double layer LaPrNiO_(4+δ) cathode was found equal to 0.11 Ω cm~2 at 600 °C, which is the lowest value available in the literature for this composition.