Optimizing La1-xSrxFeO3-δ electrodes for symmetrical reversible solid oxide cells

The effect of temperature and oxygen partial pressure on the concentration of iron and manganese ions in La1/3Sr2/3Fe1−xMnxO3−δ

“…Although the La 1/3 Sr 2/3 Fe 1Àx Mn x O 3Àd oxides comprise iron and manganese in one sublattice, these elements demonstrate thermodynamic parameters close to those they have in perovskite structured ferrites and manganites, respectively. 23,24 For instance, the absolute value of the enthalpy of manganese oxidation reaction (2) is more than twice higher than that of iron oxidation reaction (1). Thus, the enthalpy and entropy of defect formation reactions have reasonable values that change monotonically with increasing manganese concentration.…”

“…This is an empirical parameter that can reflect steric disturbance, 17 specific oxygen coordination of cations, 18 or an impact of intercrystalline defects. The used model assumes that defects in La 1/3 Sr 2/3 Fe 1Àx Mn x O 3Àd can be formed as a result of four reactions: oxidation of iron and manganese (1,2), and charge disproportionation on iron and manganese ions (3,4):…”

“…These oxides have attracted considerable research activities due to their potential application as electrode materials for solid oxide fuel and electrolysis cells (SOFC and SOEC). [1][2][3][4][5][6] Manganites are the most widely used cathode materials for high-temperature SOFC. 7 These oxides have high electron conductivity (240 S cm À1 at 800 1C for x = 0.3), but negligible oxygen ion conductivity in an ambient atmosphere even at 900 1C.…”

“…These oxides have attracted considerable research activities due to their potential application as electrode materials for solid oxide fuel and electrolysis cells (SOFC and SOEC). 1–6…”