High temperature carbon dioxide electrolyzers are expected to play a key role on carbon neutral energy cycle. Here we report a novel composite, namely perovskite SrFeO3-delta with impregnated Ni nanoparticles, as an advanced cathode materials for solid oxide electrolysis cells (SOECs). The XRD, SEM and TEM together indicate that the homogeneously distributed Ni nanoparticles on SrFeO3-delta substrate create sufficient and active triple-phase boundary (TPB) for electrochemical carbon dioxide splitting. Electrochemical measurements show that this tailored SrFeO3-delta cathode demonstrates better performance, and then exhibits long-term stability after 100 h operation and 8 redox cycles. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.