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http://dx.doi.org/10.31613/ceramist.2018.21.4.06

Influence of Gd0.1Ce0.9O2-δ Interlayer between La0.6Sr0.4Co0.2Fe0.8O3-δ Cathode and Sc-doped Zirconia Electrolyte on the Electrochemical Performance of Solid Oxide Fuel Cells  

Lim, Jinhyuk (Center for High Temperature Energy Materials Research, Korea Institute of Science and Technology)
Jung, Hwa Young (Center for High Temperature Energy Materials Research, Korea Institute of Science and Technology)
Jung, Hun-Gi (Center for High Temperature Energy Materials Research, Korea Institute of Science and Technology)
Ji, Ho-Il (Center for High Temperature Energy Materials Research, Korea Institute of Science and Technology)
Lee, Jong-Ho (Center for High Temperature Energy Materials Research, Korea Institute of Science and Technology)
Publication Information
Ceramist / v.21, no.4, 2018 , pp. 378-387 More about this Journal
Abstract
The optimal fabrication conditions for $Gd_{0.1}Ce_{0.9}O_{2-{\delta}}$(GDC) buffer layer and $La_{0.6}Sr_{0.4}Co_{0.2}Fe_{0.8}O_{3-{\delta}}$ (LSCF) cathode on 1mol% $CeO_2-10mol%\;Sc_2O_3$ stabilized $ZrO_2$ (CeScSZ) electrolyte were investigated for application of IT-SOFCs. GDC buffer layer was used in order to prevent undesired chemical reactions between LSCF and CeScSZ. These experiments were carried out with $5{\times}5cm^2$ anode supported unit cells to investigate the tendencies of electrochemical performance, Microstructure development and interface reaction between LSCF/GDC/CeScSZ along with the variations of GDC buffer layer thickness, sintering temperatures of GDC and LSCF were checked, respectively. Electrochemical performance was analyzed by DC current-voltage measurement and AC impedance spectroscopy. Microstructure and interface reaction were investigated by scanning electron microscopy (SEM) and energy dispersive spectroscopy (EDS). Although the interfacial reaction between these materials could not be perfectly inhibited, We found that the cell, in which $6{\mu}m$ GDC interlayer sintered at $1200^{\circ}C$ and LSCF sintered at $1000^{\circ}C$ were applied, showed good interfacial adhesions and effective suppression of Sr, thereby resulting in fairly good performance with power density of $0.71W/cm^2$ at $800^{\circ}C$ and 0.7V.
Keywords
SOFC; Electrolyte; GDC buffer layer; LSCF cathode;
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