Modifying the cathodes of intermediate-temperature solid oxide fuel cells with a Ce0.8Sm0.2O2 sol-gel coating

Jeong Woo Yun, Sung Pil Yoon, Sanggyun Park, Jonghee Han, Suk Woo Nam, Tae Hoon Lim, Jin Soo Kim

Research output: Contribution to journalArticle

19 Citations (Scopus)

Abstract

To increase the performance of solid oxide fuel cells operated at intermediate temperatures (<700 °C), we used the electronic conductor La0.8Sr0.2MnO3 (LSM) and the mixed conductor La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) to modify the cathode in the electrode microstructure. For both cathode materials, we employed a Sm0.2Ce0.8O2 (SDC) buffer layer as a diffusion barrier on the yttria-stabilized zirconia (YSZ) electrolyte to prevent the interlayer formation of SrZrO3 and La2Zr2O7, which have a poor ionic conductivity. These interfacial reaction products were formed only minimally at the electrolyte-cathode interlayer after sintering the SDC layer at high temperature; in addition, the degree of cathode polarization also decreased. Moreover to extend the triple phase boundary and improve cell performance at intermediate temperatures, we used sol-gel methods to coat an SDC layer on the cathode pore walls. The cathode resistance of the LSCF cathode cell featuring SDC modification reached as low as 0.11 Ω cm2 in air when measured at 700 °C. The maximum power densities of the cells featuring the modified LSCF and LSM cathodes were 369 and 271 mW/cm2, respectively, when using O2 as the oxidant and H2 as the fuel.

Original languageEnglish
Pages (from-to)9213-9219
Number of pages7
JournalInternational Journal of Hydrogen Energy
Volume34
Issue number22
DOIs
Publication statusPublished - 2009 Nov

Keywords

  • Ceria coating
  • Diffusion barrier layer
  • Intermediate-temperature solid oxide fuel cell
  • LaSrCoFeO
  • LaSrMnO

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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