Perovskite SrFeO3−δ decorated with Ni nanoparticles for high temperature carbon dioxide electrolysis

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−δ 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−δ substrate create sufficient and active triple-phase boundary (TPB) for electrochemical carbon dioxide splitting. Electrochemical measurements show that this tailored SrFeO3−δ cathode demonstrates better performance, and then exhibits long-term stability after 100 h operation and 8 redox cycles.