Sr 2 FeNi 0.4 Mo 0.6 O 6−δ Evolution for SOFC and SOEC Applications

• Published in: Journal of the Electrochemical Society 2023-11, Vol.170 (11), p.114511
• Main Authors: Felli, A., Duranti, L., Marelli, M., Dosa, M., Di Bartolomeo, E., Piumetti, M., Boaro, M.
• Format: Article
• Language: English
• ISSN: 0013-4651; 1945-7111
• DOI: 10.1149/1945-7111/ad06e7

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 Sr 2 FeNi 0.4 Mo 0.6 O 6- 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 CO 2 electrolysis in SOEC configuration, providing SFNM with a high versatility in solid oxide cells applications. Structural evolution of Sr 2 FeMo 0.6 Ni 0.4 O 6 (SFNM) is studied in various reduction conditions. XRD and TPR characterizations provides insights into the redox behavior of SFMN. Metals exsolution and the formation of a Ruddlesden-Popper (RP) are interdependent phenomena. Cathodic polarization causes metal nanoparticles to be covered by the RP phase. This unusual morphology increases the CO 2 electroreduction activity into SOEC.