Structural, Electrical, and Electrochemical Characteristics of LnBa(0.5)Sr(0.5)Co(1.5)Fe(0.5)O(5+delta) (Ln=Pr, Sm, Gd) as Cathode Materials in Intermediate-Temperature Solid Oxide Fuel Cells
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- Structural, Electrical, and Electrochemical Characteristics of LnBa(0.5)Sr(0.5)Co(1.5)Fe(0.5)O(5+delta) (Ln=Pr, Sm, Gd) as Cathode Materials in Intermediate-Temperature Solid Oxide Fuel Cells
- Jeong, Donghwi; Jun, Areum; Ju, Young-Wan; Hyodo. Junji; Shin, Jeeyoung; Ishihara, Tatsumi; Lim, Tak-Hyoung; Kim, Guntae
- Issue Date
- WILEY-V C H VERLAG GMBH
- ENERGY TECHNOLOGY, v.5, no.8, pp.1337 - 1343
- Layered perovskite oxides have received great attention as prospective cathode materials for intermediate-temperature solid oxide fuel cells (IT-SOFCs) because of their high electrical conductivities and fast oxygen kinetics. Herein, we focus on the structural, electrical, and electrochemical properties of layered perovskites LnBa0.5Sr0.5Co1.5Fe0.5O5+δ (LnBSCF, Ln=Pr, Sm, and Gd) as a cathode material for IT-SOFCs. Among the evaluated perovskites, PrBa0.5Sr0.5Co1.5Fe0.5O5+δ (PBSCF) showed the highest electrical conductivity, the highest oxygen content, and the highest values of the oxygen bulk diffusion coefficient (D*) and surface exchange coefficient (k) measured by using isotope oxygen exchange. The composite cathode of PBSCF and gadolinium-doped ceria is the most suitable cathode material for IT-SOFCs among the materials investigated because of its excellent electrochemical properties and fast oxygen kinetics.
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