Development of LSCF-GDC composite cathodes for low-temperature solid oxide fuel cells with thin film GDC electrolyte

Yongjun Leng, Siew Hwa Chan, Qinglin Liu

Research output: Contribution to journalArticle

252 Scopus citations

Abstract

La0.6Sr0.4Co0.2Fe0.8O3 (LSCF) powder was prepared by glycine-nitrate combustion method. The electrochemical properties of porous LSCF cathodes and LSCF-Gd0.1Ce0.9O1.95 (GDC) composite cathodes were evaluated at intermediate/low temperatures of 500-700 °C. The polarization resistance of pure LSCF cathode sintered at 975 °C for 2 h was 1.20 Ω cm2 at 600 °C. The good performance of pure LSCF cathode is attributed to its unique microstructure-small grain size, high porosity and large surface area. The addition of GDC to LSCF cathode further reduced the polarization resistance. The lowest polarization resistance of 0.17 Ω cm2 was achieved at 600 °C for LSCF-GDC (40:60 wt%) composite cathode. An anode-supported solid oxide fuel cell (SOFC) was prepared using LSCF-GDC (40:60 wt%) composite as cathode, GDC film (49-μm-thick) as electrolyte, and Ni-GDC (65:35 wt%) as anode. The total electrode polarization resistance was 0.27 Ω cm2 at 600 °C, which implies that LSCF-GDC (40:60 wt%) composite cathode used in the anode-supported SOFC had a polarization resistance lower than 0.27 Ω cm2 at 600 °C. The cell generated good performance with the maximum power density of 562, 422, 257 and 139 mW/cm2 at 650, 600, 550 and 500 °C, respectively.

Original languageEnglish (US)
Pages (from-to)3808-3817
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume33
Issue number14
DOIs
StatePublished - Jul 1 2008

All Science Journal Classification (ASJC) codes

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

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