Nonstoichiometry and transport properties of strontium-substituted lanthanum cobaltites

Partial reduction and re-oxidation of iron-and cobalt-containing perovskites using catalyst characterisation measurements

“…8 As listed in Table 1 the measured d-values are slightly lower than the values reported by Mantzavinos et al [7] and significantly lower than the values reported by Ref. [13], which is probably due to the above-mentioned oxygen uptake during cooling down and initialisation. No values could be found for comparison for the activation energies no values could be found for comparison.…”

“…One reason for this lack of data is that most of the measurement procedures include an increase of the oxygen vacancy concentration with increasing temperature leading to faster kinetics. In the last row the oxygen stoichiometry changes previously measured with solid electrolyte coulometry are listed [7,13]. a Due to the shape of the peak, the value was determined from the three-quarter width.…”

Sr2Fe1.5Mo0.5O6 as Cathodes for Intermediate-Temperature Solid Oxide Fuel Cells with La0.8Sr0.2Ga0.87Mg0.13O3 Electrolyte

“…Figure 2 shows the time variations of the conductivity of SFMO at 700 and 750 C when the oxygen partial pressure is suddenly changed from 0.21 to 0.1 atm. The D chem and k ex listed in Table I are obtained by fitting these experimental data to the theoretical equations (1) 22,23 suggesting that the SFMO may have similar electrochemical activity for oxygen reduction to that of Co-based cathode materials.…”

Effect of dopant addition on oxygen sorption properties of La-Sr-Co-Fe-O perovskite type oxide

“…Perovskite type metal oxides may transform from the disordered perovskite structure to an ordered brownmillerite structure with decreasing oxygen partial pressure at lower temperature range (Yang and Lin, 2005). For perovskite type metal oxides without the disorder to order phase transition, the oxygen nonstoichiometry increases with increasing temperature in both He and Schematic description of the difference in oxygen storage capacity between materials with and without a phase transition air, with the degree of increase in He higher than in air (Mizusaki et al, 1985(Mizusaki et al, , 1989Sitte et al, 2002). These are shown by the two solid curves in Fig.…”