Abstract
Abstract The electrochemical properties of La 0.8 Sr 0.2 Mn 1 − x Cu x O 3 (0 ≤ x ≤ 0.2)–Gd 0.2 Ce 0.8 O 2 − δ (GDC) composite cathodes are determined in the intermediate-temperature range (600–850 °C), and their cathode performance is analyzed in the context of their phase transition behavior at elevated temperatures. The addition of Cu to LSM forces Mn 3 + to Mn 4 + , thereby increasing the Mn 4 + concentration with increasing Cu doping. The increased Mn 4 + concentration increases the cubic phase fraction, and thus enhances the low-temperature performance of the LSM cathode. The La 0.8 Sr 0.2 Mn 0.8 Cu 0.2 O 3 –GDC yields the greatest low-temperature cubic phase fraction and shows the smallest area specific resistance (0.49 Ω cm 2 at 750 °C) of the compositions tested.
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