Kim, Junseok Kim, Joonhwan Yoon, Kyung Joong Son, Ji-Won Lee, Jong-Ho Lee, Jong-Heun Lee, Hae-Weon Ji, Ho-Il 2024-01-19T16:00:55Z 2024-01-19T16:00:55Z 2021-09-02 2020-12-15 0925-8388 https://pubs.kist.re.kr/handle/201004/117678 Solid oxide fuel cell (SOFC) with yttria-stabilized zirconia (YSZ)/gadolinium-doped ceria (GDC) bilayer electrolytes has been considered one of representative types of high-performance intermediate-temperature SOFCs, because it enables to apply highly active cathode materials. However, the processing of fully dense bilayer electrolytes with good interfacial structure, which are essential for high-performance and secure operation, has not yet been successfully achieved. Here, we present a simple and costeffective roll calendering process for fabrication of SOFCs with YSZ/GDC bilayer electrolytes. From understanding on the correlation between processing conditions of roll calendering and microstructure of bilayer electrolytes, the roll calendering process is optimized, and in turn, the bilayer electrolytes with overall thickness of 8.0 mm, relative density above 98%, and enhanced interfacial connectivity of 69% is obtained by co-sintering at reduced temperature of 1250 degrees C. This excellent structural enhancement in comparison with conventional uniaxial pressing process is explained by a shear force applied during roll calendering process, which presumably facilitates particle rearrangement within bilayer electrolytes. The optimized cell yields promising electrochemical performance of 1.45 W/cm(2) at current density of 2 A/cm(2) and low ohmic resistance of 0.046 U cm(2) at 800 degrees C. (C) 2020 Elsevier B.V. All rights reserved. English ELSEVIER SCIENCE SA TEMPERATURE PERFORMANCE DEGRADATION FABRICATION COMPACTION STABILITY STRATEGY Solid oxide fuel cells with zirconia/ceria bilayer electrolytes via roll calendering process Article 10.1016/j.jallcom.2020.156318 1 JOURNAL OF ALLOYS AND COMPOUNDS, v.846 JOURNAL OF ALLOYS AND COMPOUNDS 846 scie scopus 000568826500011 2-s2.0-85088819550 Chemistry, Physical Materials Science, Multidisciplinary Metallurgy & Metallurgical Engineering Chemistry Materials Science Metallurgy & Metallurgical Engineering Article TEMPERATURE PERFORMANCE DEGRADATION FABRICATION COMPACTION STABILITY STRATEGY Roll calendering Bilayer electrolytes Shear stress Solid oxide fuel cells Tape lamination