SrCo1-xMoxO3-δ (0 ≤ X ≤ 1) electrode materials for Intermediate Temperature Symmetrical Solid Oxide Fuel Cells

S. OROZCO GIL; L. M. TOSCANI; S. A. LARRONDO; D. G. LAMAS

Buenos Aires

Congreso; VIII Symposium on Hydrogen, Fuel Cells and Advanced Batteries - HYCELTEC 2022; 2022

Solid Oxide Fuel Cells (SOFCs) convert the chemical energy of a fuel into electricity via electrochemical reactions. Intermediate-temperature SOFCs (IT-SOFCs) operating between 500 oC and 800 oC, are widely studied in order to improve SOFCs performance. In this regard, mixed ionic-electronic conductors (MIEC) exhibit the highest electrical conductivity and oxygen permeability values to be implemented as materials for IT-SOFCs. Additionally, symmetrical SOFCs (SSOFCs) that use the same material as both cathode and anode, could solve pollution problems, since they can remove sulfur and carbon deposition on the anode side by reversing the gas flow and simplify manufacturing processes of SOFCs.Several MIEC materials have been studied as possible SSOFCs electrodes working at intermediate temperature (ITSSOFCs), principally perovskite and double perovskite-type oxides. Particular crystal structures of SrCo1-xMxO3-𝛿 (M = Sb, Mo, Nb, Ti, V) [1] and SrMo1-xMxO3-𝛿 (M = Fe, Cr, Co) [2] oxides have been reported as high-performance cathode and anode for SOFCs respectively. In this regard, SrCo1-xMoxO3-δ (0 ≤ X ≤ 1) may be a good option for electrode materials of IT-SSOFCs. Thus, it is interesting to study their structural features, strongly related with electrochemical response.In the present work, SrCo1-xMoxO3-δ (0 ≤ X ≤ 1) perovskites were synthesized by gel-combustion method with a non-stoichiometric route. Crystal structure and reducibility of the samples are correlated with their composition on B-site of perovskite to identify those samples that exhibitphase stability at room temperature in both air and reducing atmosphere, which could become potential electrode materials for IT-SSOFCs. Furthermore, electrolyte densification is studied as a function of the pressure and heat treatments during pellet fabrication, as well as possible electrode-electrolyte reactivity.