High performance Ca-containing La2-xCaxNiO4+δ (0≤x≤0.75) cathode for proton-conducting solid oxide fuel cells

In order to optimize the performance of La2NiO4+delta materials as H-SOFC cathodes, different Ca doping amounts (x = 0, 0.25, 0.5, 0.75) is adopted to find the best solution. Doping with Ca in La2NiO4+delta can effectively improve the electrical conductivity and the ORR activity of the cathode surface, which have good chemical stability and compatible TEC with the electrolyte. Electrochemical studies reveal that La1.5Ca0.5NiO4+delta cathode shows the best electrochemical performance in single cell tests outputing the maximum power density (MPD) of 923 mW cm(-2) and the polarization resistance (R-p) of 0.053 Omega cm(2) at 700 degrees C. This work indicates that the single-phase R-P layered material La1.5Ca0.5NiO4+delta could be a promising cathode for H-SOFC. (C) 2020 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.