title: Nanostructured Double Perovskite Cathode With Low Sintering Temperature For Intermediate Temperature Solid Oxide Fuel Cells.
abstract: This study focuses on reducing the cathode polarization resistance through the use of mixed ionic electronic conductors and the optimization of cathode microstructure to increase the number of electrochemically active sites. Among the available mixed ionic electronic conductors (MIECs), the layered perovskite GdBa0.5 Sr0.5 CoFeO5+δ (GBSCF) was chosen as a cathode material for intermediate temperature solid oxide fuel cells owing to its excellent electrochemical performance and structural stability. The optimized microstructure of a GBSCF-yttria-stabilized zirconia (YSZ) composite cathode was prepared through an infiltration method with careful control of the sintering temperature to achieve high surface area, adequate porosity, and well-organized connection between nanosized particles to transfer electrons. A symmetric cell shows outstanding results, with the cathode exhibiting an area-specific resistance of 0.006 Ω cm(2) at 700 °C. The maximum power density of a single cell using Ce-Pd anode with a thickness of ∼80 μm electrolyte was ∼0.6 W cm(-2) at 700 °C.
authors.affiliation: Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 698-798 (South Korea), Fax: (+82) 52-217-2909.
authors.forename: Seona
authors.initials: S
authors.lastname: Kim
authors.affiliation: Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 698-798 (South Korea), Fax: (+82) 52-217-2909.
authors.forename: Areum
authors.initials: A
authors.lastname: Jun
authors.affiliation: Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 698-798 (South Korea), Fax: (+82) 52-217-2909.
authors.forename: Ohhun
authors.initials: O
authors.lastname: Kwon
authors.affiliation: Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 698-798 (South Korea), Fax: (+82) 52-217-2909.
authors.forename: Junyoung
authors.initials: J
authors.lastname: Kim
authors.affiliation: Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 698-798 (South Korea), Fax: (+82) 52-217-2909.
authors.forename: Seonyoung
authors.initials: S
authors.lastname: Yoo
authors.affiliation: UNIST Central Research Facilities, Ulsan National Institute of Science and Technology (UNIST), Ulsan 698-798 (South Korea).
authors.forename: Hu Young
authors.initials: HY
authors.lastname: Jeong
authors.affiliation: Department of Mechanical Engineering, Dong-Eui University, Busan 614-714 (South Korea), Fax: (+82) 505-182-6891. jyshin@deu.ac.kr.
authors.forename: Jeeyoung
authors.initials: J
authors.lastname: Shin
authors.affiliation: Department of Energy Engineering, Ulsan National Institute of Science and Technology (UNIST), Ulsan 698-798 (South Korea), Fax: (+82) 52-217-2909. gtkim@unist.ac.kr.
authors.forename: Guntae
authors.initials: G
authors.lastname: Kim
keywords: energy conversion; fuel cells; nanoparticles; nanostructures; perovskite phases