Synthesis and properties of Sm3+-deficient Sm1−xBaCo2O5+δ perovskite oxides as cathode materials

Cobalt based layered perovskites as cathode material for intermediate temperature Solid Oxide Fuel Cells: A brief review

“…Although the highest total electrical conductivity is met at a Ba deficiency equal to 5% (750 S cm À1 at 700 C), ASR investigation revealed that the optimal electrocatalytic activity in the oxygen reduction process was realized by the compound with 10% Ba understoichiometry, where the ASR (0.1 U cm 2 at 700 C) was tenfold reduced with respect to the stoichiometric compound. The same trends have been observed in the circumstance of an A site deficiency series of double perovskites (Sm 1Àx BaCo 2 O 5þd with x ¼ 0e0.08 [63]). These materials present a decrease in both conductivity and ASR values with increasing deficiency up to x ¼ 0.05; this change in performance is accompanied by a growth in the size of the orthorhombic cell.…”

“…The lowest reported ASR values are 0.10 U cm 2 at 700 C for SmBaCo 2 O 5þd ( Table 7, Ref. [63]) and 0.07 U cm 2 in SmSrCo 2 O 5þd (Ref. [64]).…”

Computational study of the mixed B-site perovskite SmBxCo1−xO3−d(B = Mn, Fe, Ni, Cu) for next generation solid oxide fuel cell cathodes

“…7 In view of the above, new cathode materials are sought, which has led to interest in cobalt-based cathodes. 8 These materials have shown excellent SOFC cathode properties at intermediate temperatures, with high s O and s e . 8 A promising material is SmCoO 3 , which is in itself a semiconductor, but by doping this perovskite on the Co-site with manganese, nickel, iron, or copper, s e can be increased through modification of its electronic structure.…”

“…8 These materials have shown excellent SOFC cathode properties at intermediate temperatures, with high s O and s e . 8 A promising material is SmCoO 3 , which is in itself a semiconductor, but by doping this perovskite on the Co-site with manganese, nickel, iron, or copper, s e can be increased through modification of its electronic structure. [9][10][11][12] Such doping makes SmCoO 3 a p-type semiconductor, and samarium oxide perovskites doped with transition metals on the B sites, show excellent promise as intermediate temperature (IT-SOFC) cathodes.…”

A computational study of the electronic properties, ionic conduction, and thermal expansion of Sm1−xAxCoO3and Sm1−xAxCoO3−x/2(A = Ba2+, Ca2+, Sr2+, and x = 0.25, 0.5) as intermediate temperature SOFC cathodes

“…[6][7][8][9][10][11][12][13] Upon doping, the overall charge of the system can be compensated via two different charge compensation schemes. On the one hand, oxygen vacancies (V O ) can be generated, as described in eqn (1), according to the Kröger-Vink notation:…”