Sandwiched ultra-thin yttria-stabilized zirconia layer to effectively and reliably block reduction of thin-film gadolinia-doped ceria electrolyte

Ho Sung Noh, Jongsup Hong, Hyoungchul Kim, Kyung Joong Yoon, Jong Ho Lee, Byung Kook Kim, Ji Won Son

Research output: Contribution to journalArticlepeer-review

4 Citations (Scopus)

Abstract

To investigate the possibility of reducing the thickness of the yttria-stabilized zirconia (YSZ) blocking layer of the gadolinia-doped ceria (GDC) electrolyte of the thin-film solid oxide fuel cell (TF-SOFC), a sandwich electrolyte configuration consisting of GDC/ YSZ/GDC tri-layers is constructed. With only a 100 nm-thick YSZ layer, the TF-SOFC yielded high open circuit voltage (OCV) values (1.05Vat 650°C), which indicates that the ultra-thin YSZ layer is deposited without massive defects and functions properly as a reduction blocking layer of the GDC electrolyte. The peak power density reaches approximately 2.1Wcm-2 at 650°C, which is at the ultimate performance level of the TF-SOFC. In electrochemical impedance spectra (EIS) analyses, an exaggerated lowfrequency (LF) impedance at OCV is observed, which is considered to be originated from the chemical capacitance of the bottom GDC layer acting as an anode. In some cases, certain defects at the bottom GDC layer are identified, which are postulated to be caused by the chemical expansion and mechanical frailty of GDC exposed to the reducing atmosphere. Therefore, both the advantage and the disadvantage should be considered for reliably employing the sandwich electrolyte configuration.

Original languageEnglish
Pages (from-to)263-267
Number of pages5
JournalJournal of the Ceramic Society of Japan
Volume123
Issue number1436
DOIs
Publication statusPublished - 2015 Apr 1

Bibliographical note

Publisher Copyright:
© 2015 The Ceramic Society of Japan.

All Science Journal Classification (ASJC) codes

  • Ceramics and Composites
  • Chemistry(all)
  • Condensed Matter Physics
  • Materials Chemistry

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