Comparison of oxygen exchange kinetics of the IT-SOFC cathode materials La0.5Sr0.5CoO3−δ and La0.6Sr0.4CoO3−δ

The Effect of Precursor Solution Desiccation or Nano-Ceria Pre-Infiltration on Various La0.6Sr0.4FeyCo1-yO3-xInfiltrate Compositions

“…9,[13][14][15]20,21 For electrodes fabricated with a particular infiltration method, Figure 1 shows that the electrode resistance systematically decreases as the infiltrate Co:Fe ratio increases. This behavior is consistent with previous literature studies showing that at typical SOFC operating temperatures the oxygen surface exchange resistance (Rs) of materials within the LSC-LSF solid solution decrease as the Co:Fe ratio increases, 17,18,[22][23][24] and suggests that oxygen surface exchange is a dominant source of resistance in these cathodes at 600…”

Oxygen transport and surface exchange properties of Sr0.5Sm0.5CoO3−δ

“…The value obtained, 900, is high but comparable to that reported for LSCF [22]. Even those perovskites with smaller γ o (~50-200) [23][24][25][26] are relatively invariant in γ o with temperature, which justifies the assumption made in the present work. Converting the D values into D* values by Eq.…”

Pulsed laser deposition of La 0.6 Ca 0.4 Fe 0.8 Ni 0.2 O 3−δ thin films on SrTiO 3 : Preparation, characterization and electrical properties

“…Compared with cobalt-based cathode materials such as Ba 0.5 Sr 0.5 Co 0.8 Fe 0.2 O 3 − δ and Ln 1 −x A x CoO 3 − δ (Ln = lanthanides) typically like La 1 − x Sr x CoO 3 despite having excellent electrochemical performance, suffers from problems such as a very high thermal expansion coefficient and high reactivity with the SOFC electrolyte material (yttria stabilized zirconia (YSZ)), which makes it necessary to apply additional barrier layers or to use alternative solid electrolytes in the cell. On the other hand, chemical instability and high temperature volatility of perovskite iron-based cathodes such as Ln 1 − x A x FeO 3 − δ phases (for example, La 0.3 Sr 0.7 FeO 3 − δ , and La 0.6 Sr 0.4 Fe 0.9 Ni 0.1 O 3 − δ ), show close thermal expansion coefficient with electrolyte, good long-term stability and high Cr-resistance sacrificing partly electrochemical activity [8,9]. In this materials, when the Fe fraction is higher than 0.5 the materials exhibit a high electronic conductivity.…”