Solid oxide fuel cells with zirconia/ceria bilayer electrolytes via roll calendering process

Junseok Kim, Joonhwan Kim, Kyung Joong Yoon, Ji Won Son, Jong Ho Lee, Jong Heun Lee, Hae Weon Lee, Ho Il Ji

Research output: Contribution to journalArticle

Abstract

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 cost-effective 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 μm, relative density above 98%, and enhanced interfacial connectivity of 69% is obtained by co-sintering at reduced temperature of 1250 °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/cm2 at current density of 2 A/cm2 and low ohmic resistance of 0.046 Ω cm2 at 800 °C.

Original languageEnglish
Article number156318
JournalJournal of Alloys and Compounds
Volume846
DOIs
Publication statusPublished - 2020 Dec 15

Keywords

  • Bilayer electrolytes
  • Roll calendering
  • Shear stress
  • Solid oxide fuel cells
  • Tape lamination

ASJC Scopus subject areas

  • Mechanics of Materials
  • Mechanical Engineering
  • Metals and Alloys
  • Materials Chemistry

Fingerprint Dive into the research topics of 'Solid oxide fuel cells with zirconia/ceria bilayer electrolytes via roll calendering process'. Together they form a unique fingerprint.

  • Cite this