Investigation of novel solid oxide fuel cell cathodes based on impregnation of SrTixFe1-xO3-δ into ceria-based backbones

Mathias Brinch-Larsen, Martin Søgaard, Johan Hjelm, Henrik Lund Frandsen

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

Abstract

Solid oxide fuel cell (SOFC) cathodes were prepared by impregnating the nitrates corresponding to SrTixFe1-xO3-δ (STF), x= 0; 0.1; 0.2; 0.3; 0.4 and 0.5, into a porous backbone of Ce 0.9Gd0.1O2-δ (CGO). STF was chosen as very high oxygen surface exchange rate, high ionic conductivity and electrochemical stability as a thin film electrode have been reported for these materials. XRD measurements showed a high degree of secondary phase formation in the infiltrate as well as reaction with the CGO backbone. Microstructural analysis showed that the STF infiltrate had formed a coating on the CGO backbone. All prepared electrodes were characterized as symmetric cells using impedance spectroscopy. Within the investigated series the infiltrate with x = 0.1 (STF10) showed the best performance with an area specific resistance (ASR) of ASR ≈ 6.4 Ω cm2 (STF10) at 600°C in air. The relatively poor performance is believed to originate from poor electronic conduction in the electrodes and possibly also reactions between Sr-containing compounds and CGO. To circumvent the low electronic conductivity, backbones of a composite cathode containing LaCo0.4Ni0.6O 3-δ (LCN60) and CGO were also tried infiltrated with STF. The ASR of the backbone was 8.7 Ω cm2 prior to infiltration and this decreased to 0.34 Ω cm2 after infiltration with STF10.
Original languageEnglish
Title of host publicationAdvances in Solid Oxide Fuel Cells VIII - 36th International Conference on Advanced Ceramics and Composites, ICACC 2012
PublisherAmerican Ceramic Society
Publication date2013
Pages1-12
ISBN (Print)9781118205945
Publication statusPublished - 2013
Event36th International Conference on Advanced Ceramics and Composites - Daytona Beach, FL, United States
Duration: 22 Jan 201227 Jan 2012
Conference number: 36

Conference

Conference36th International Conference on Advanced Ceramics and Composites
Number36
CountryUnited States
CityDaytona Beach, FL
Period22/01/201227/01/2012
SeriesCeramic Engineering and Science Proceedings
Number4
Volume33
ISSN0196-6219

Keywords

  • Ceramic materials
  • Electric conductivity
  • Film preparation
  • Impregnation
  • Iron compounds
  • Solid oxide fuel cells (SOFC)
  • Cathodes

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