Abstract
The La0.4K0.1Ca0.5MnO3-δ (LKCM) material has been successfully prepared by partially replacing La cations with K cations in La0.5Ca0.5MnO3-δ (LCM). The relatively low calcination temperature retained K cations in the lattice. Doping K triggered the cathode activity of the material, and LKCM showed more oxygen vacancies and improved catalytic activity than LCM. Therefore, a proton-conducting solid oxide fuel cell(H–SOFC) using an LKCM cathode exhibited better performance than the LCM cell. Despite the high basicity of K, the incorporation of 10 mol.% K into LCM did not significantly change the chemical stability of the material. LKCM still presented good stability against CO2. First-principles calculations revealed the mechanism for good stability. Further optimizations of the cell structure led to an impressively high fuel cell performance of 1317 mW cm−2 at 700 °C for the LKCM cell, which was larger than most H–SOFCs using Mn-based cathodes in literature reports.
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