Sr2FeNi0.4Mo0.6O6−δ Evolution for SOFC and SOEC Applications

Abstract

Solid Oxide Cell electrode engineering is of paramount importance to obtain high performing, versatile and reliable devices. In this work, the structural and morphological evolution of Sr2FeNi0.4Mo0.6O6-δ (SFNM) is investigated and fully characterized over subsequent temperature programmed reductions. Comparison of the results of X-ray diffraction, high transmission electron microscopy and electrochemical impedance spectroscopy analyses confirms how metallic phase exsolution upon reduction endows the perovskite with highly active Ni-Fe-based catalytic sites for applications in hydrogen-fueled SOFCs. As a novelty, this study presents voltage-induced reduction of SFNM at 1.6 V as a fast and reliable way to induce morphological and structural changes of the SFMN-derivate exsolved-perovskite. This enhances its catalytic activity towards CO2 electrolysis in SOEC configuration, providing SFNM with a high versatility in solid oxide cells applications.