Ce0.8Gd0.2O2 modification on La0.6Sr0.4Co0.2Fe0.8O3 cathode for improving a cell performance in intermediate temperature solid oxide fuel cells

Jeong Woo Yun, Jonghee Han, Sung Pil Yoon, Sanggyun Park, Hee Su Kim, Suk Woo Nam

Research output: Contribution to journalArticle

10 Citations (Scopus)

Abstract

To increase the cell performance of solid oxide fuel cells operated at intermediate temperature (600-800°C), Ce0.8Gd0.2O2 (GDC) was applied to the La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) cathode in electrode microstructure using sol-gel coating. We employed a GDC as a diffusion barrier layer on the yttria-stabilized zironia (YSZ) electrolyte to prevent the interlayer formation of SrZrO3, which has poor ionic conductivity. This interfacial reaction product was hardly formed at the electrolyte-cathode interlayer after sintering the GDC layer resulting to reduce the cathode polarization resistance. Moreover, we use sol-gel method to coat GDC thin layer through the cathode pore wall surface to extend the triple phase boundary (TPB) area. The cathode polarization resistance also reduced due to the additional TPB area. For the single cell featuring LSCF cathode modified with GDC sol-gel coating, the maximum densities were 0.41W/cm2 and 0.89W/cm2 at 700°C and 800°C.

Original languageEnglish
Pages (from-to)439-444
Number of pages6
JournalJournal of Industrial and Engineering Chemistry
Volume17
Issue number3
DOIs
Publication statusPublished - 2011 May 25

Keywords

  • Diffusion barrier layer CeGdO
  • Intermediate-temperature solid oxide fuel cell
  • LaSrCoFeO

ASJC Scopus subject areas

  • Chemical Engineering(all)

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