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Ceramist > Volume 21(4); 2018 > Article
Ceramist 2018;21(4):378-387.
DOI: https://doi.org/10.31613/ceramist.2018.21.4.06    Published online December 31, 2018.
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
Jinhyuk Lim, Hwa Young Jung, Hun-Gi Jung, Ho-Il Ji, Jong-Ho Lee
Center for High Temperature Energy Materials Research, Korea Institute of Science and Technology, Seoul 02792, Korea
La0.6Sr0.4Co0.2Fe0.8O3-δ 공기극과 Sc이 도핑된 지르코니아 전해질 사이에 삽입한 Gd0.1Ce0.9O2-δ 중간층이 고체산화물 연료전지의 전기화학적 성능에 미치는 영향
임진혁, 정화영, 정훈기, 지호일, 이종호
고온에너지재료연구센터, 한국과학기술연구원
Correspondence:  Jong-Ho Lee,
Received: 23 November 2018   • Accepted: 17 December 2018
The optimal fabrication conditions for Gd0.1Ce0.9O2-δ(GDC) buffer layer and La0.6Sr0.4Co0.2Fe0.8O3-δ (LSCF) cathode on 1mol% CeO2–10mol% Sc2O3 stabilized ZrO2 (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 x 5cm2 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 6μm GDC interlayer sintered at 1200℃ and LSCF sintered at 1000℃ were applied, showed good interfacial adhesions and effective suppression of Sr, thereby resulting in fairly good performance with power density of 0.71W/cm2 at 800℃ and 0.7V.
Key Words: SOFC, Electrolyte, GDC buffer layer, LSCF cathode

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