Thin film yttria-stabilized zirconia electrolyte for intermediate-temperature solid oxide fuel cells (IT-SOFCs) by chemical solution deposition

Eun Ok Oh, Chin Myung Whang, Yu Ri Lee, Jong Heun Lee, Kyung Joong Yoon, Byung Kook Kim, Ji Won Son, Jong Ho Lee, Hae Weon Lee

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

A 500nm thick thin film YSZ (yttria-stabilized zirconia) electrolyte was successfully fabricated on a conventionally processed anode substrate by spin coating of chemical solution containing slow-sintering YSZ nanoparticles with the particle size of 20nm and subsequent sintering at 1100°C. Incorporation of YSZ nanoparticles was effective for suppressing the differential densification of ultrafine precursor powder by mitigating the prevailing bi-axial constraining stress of the rigid substrate with numerous local multi-axial stress fields around them. In particular, adding 5vol% YSZ nanoparticles resulted in a dense and uniform thin film electrolyte with narrow grain size distribution, and fine residual pores in isolated state. The thin film YSZ electrolyte placed on a rigid anode substrate with the GDC (gadolinia-doped ceria) and LSC (La 0.6Sr 0.4CoO 3-δ) layers deposited by PLD (pulsed laser deposition) processes revealed that it had fairly good gas tightness relevant to a SOFC (solid oxide fuel cell) electrolyte and maintained its structural integrity during fabrication and operation processes. In fact, the open circuit voltage was 1.07V and maximum power density was 425mW/cm 2 at 600°C, which demonstrates that the chemical solution route can be a viable means for reducing electrolyte thickness for low- to intermediate-temperature SOFCs.

Original languageEnglish
Pages (from-to)1733-1741
Number of pages9
JournalJournal of the European Ceramic Society
Volume32
Issue number8
DOIs
Publication statusPublished - 2012 Jul

Keywords

  • Constrain sintering
  • Fuel cells
  • Microstructure
  • Sol-gel processes
  • Y O -ZrO

ASJC Scopus subject areas

  • Ceramics and Composites
  • Materials Chemistry

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