Catalytically active cathode materials are highly desirable for the development of low-temperature solid oxide fuel cells (LT-SOFCs). In the present study, we report the performance of a high-loading Sr0.9Y0.1CoO2.5+delta (SYC10) nanoparticles (NPs) as a catalytic cathode infiltrated in Ce0.8Gd0.2O2-delta (GDC) backbones for LT-SOFCs and the use of a low-loading SYC10 NPs as a catalyst for promoting the performance of a commercial cathode. The loading and calcination temperature of SYC10 NPs were systematically optimized to achieve the lowest area-specific polarization resistance at <= 650 degrees C. A significant reduction in polarization resistance of commercial LSCF cathode by SYC NPs has also been demonstrated at 650 degrees C. (C) 2018 Published by Elsevier Ltd on behalf of Hydrogen Energy Publications LLC.