Superior electrochemical performance and oxygen reduction kinetics of layered perovskite PrBa x Co 2 O 5+δ ( x  = 0.90–1.0) oxides as cathode materials for intermediate-temperature solid oxide fuel cells

Evaluation of (Bi0.4Sr0.6) Co0.3Fe0.7O3−δ (x = 0.7, 0.8, 0.9, 1.0, 1.1) perovskite-type oxide as potential cathode for intermediate-temperature solid oxide fuel cells

“…4d and e, respectively) in the impedance analysis. It is confirmed that the large oxygen vacancy concentration can supply more active sites for ORR and improve the oxide ionic conductivity [36,37]. As a result, further promoting the cathode performance over the x ¼ 1.1 excess than that the stoichiometry is shown.…”

EuBaCo2O5+δ-Ce0.9Gd0.1O2−δ composite cathodes for intermediate-temperature solid oxide fuel cells: high electrochemical performance and oxygen reduction kinetics

“…This structural feature leads to the fast oxygen diffusion, surface exchange kinetics, and high electrical conductivity, which are confirmed to facilitate the electrocatalytic activity for the ORR. Some studies reported that NdBaCo 2 O 6Àd , SmBaCo 2 O 6Àd and PrBaCo 2 O 6Àd are the promising cathodes due to their low cathodic polarization losses at intermediate temperatures, as proved by the polarization resistances measured to be 0.11, 0.13 and 0.04, V cm 2 [19,20,24], respectively. However, these cathode materials possess the higher thermal expansion coefficients (TECs) of $20Â10 À6 K À1 [25], compared to the normally used intermediate-temperature electrolyte materials.…”

Enhanced Electrochemical Properties of Non-stoichiometric Layered Perovskites, Sm1−xBaCo2O5+d, for IT-SOFC Cathodes

“…Strategies to develop not only excellent cathode materials for IT-SOFCs by substituting various materials into layered perovskite, but also non-stoichiometric cathode materials synthesized by removing individual elements of layered perovskite are being pursued (Kostogloudis and Ftikos, 1999;Wang et al, 2014;Sun et al, 2016;Yi et al, 2016). Based on the composition PrBaCo 2 O 5+d , PrBa 0.92 Co 2 O 5+d , in which 0.08 mol% of Ba was removed from the A // -site, showed better electrochemical properties than the composition PrBaCo 2 O 5+d .…”