Current trends in the description of lanthanum strontium manganite oxygen electrode reaction mechanism in a high-temperature solid oxide cell

Abstract

This review summarizes recent progress in understanding the oxygen reduction and evolution reactions at the lanthanum strontium manganite electrode of a high-temperature solid oxide cell. Information provided here is put into the perspective of the defect chemistry of lanthanum strontium manganite and its impact on the electrode reaction mechanisms itself. After summarizing recent views on the oxygen reduction reaction mechanism, the focus turns to the oxygen evolution reaction, which is significantly less treated in the literature. A combination of the information in the literature on both reactions was the basis for modified reaction mechanism of the oxygen evolution reaction to be proposed under consideration of recent experimental observations and theoretical findings. • Oxygen evolution and reduction reactions mechanism in solid oxide cells analysed. • LSM defect chemistry considered in the reaction mechanism discussion. • LSM electrode polarisation history role introduced. • Modification of LSM electrode state may result in reaction mechanism alternation. • Switching between two and three phase boundary mechanism considered.