Pr- and Sm-Substituted Layered Perovskite Oxide Systems for IT-SOFC Cathodes

Abstract

In this study, the phase synthesis and electrochemical properties of A/A//A///B2O5+d (A/: Lanthanide, A//: Ba, and A//: Sr) layered perovskites in which Pr and Sm were substituted at the A/-site were investigated for cathode materials of Intermediate Temperature-Operating Solid Oxide Fuel cells (IT-SOFC). In the PrxSm1-xBa0.5Sr0.5Co2O5+d (x = 0.1–0.9) systems, tetragonal (x < 0.4) and orthorhombic (x ≥ 0.5) crystalline structures were confirmed according to the substitution amount of Pr, which has a relatively large ionic radius, and Sm, which has a small ionic radius. All of the layered perovskite oxide systems utilized in this study presented typical metallic conductivity behavior, with decreasing electrical conductivity as temperature increased. In addition, Pr0.5Sm0.5Ba0.5Sr0.5Co2O5+d (PSBSCO55), showing a tetragonal crystalline structure, had the lowest conductivity values. However, the Area-Specific Resistance (ASR) of PSBSCO55 was found to be 0.10 Ωcm2 at 700 °C, which is lower than those of the other compositions.

Enhanced Cathode Performance in Pr0.5Sr0.5FeO3−δ of Perovskite Catalytic Materials via Doping with VB Subgroup Elements (V, Nb, and Ta)

“…Solid oxide fuel cells (SOFCs) perform coordinated work using various components [1][2][3][4][5][6][7][8][9]. The basic components of a battery include three parts.…”

Structural, particle size distribution, and electrochemical behavior of double perovskite oxide doped Ce0.8Sm0.2O1.9 for intermediate temperature solid oxide fuel cells

“…Mixed ionic and electronic conductor cathode (MIEC) materials generally show effectiveness in medium operating temperatures. The double perovskite LnBaCo2O5+δ (Ln-selected lanthanide) has been extensively investigated over the past ten years [8][9][10][11].…”

Generation of nanoflowers and nanoneedles on Co-based layered perovskite of IT-SOFC cathode affecting electrical conductivities

“…In particular, many types of research are currently underway to increase the diffusion of oxygen ions and enhance the surface properties by changing the structure of the cathode from an ABO3-type complex perovskite structure to an AA / B2O5+d type layered perovskite structure. In particular, the layered perovskite structure, which has the order of [CoO2]-[BaO]-[CoO2]-[LnO6] and is aligned along the c-axis, can improve oxygen ion diffusion through the distribution of oxygen vacancies [17][18][19][20].…”