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Research Papers

La0.5Sr0.2TiO3-δ Perovskite as Anode Material for Solid Oxide Fuel Cells

[+] Author and Article Information
S. Roudeau, J. C. Grenier, J. M. Bassat

Centre Nationale de la
Recherche Scientifique,
Université de Bordeaux,
Institute of Condensed Matter
Chemistry of Bordeaux,
87 Av. du Dr. A. Schweitzer,
Pessac-Cedex 33608, France

1Corresponding author.

Contributed by the Advanced Energy Systems Division of ASME for publication in the JOURNAL OF FUEL CELL SCIENCE AND TECHNOLOGY. Manuscript received June 3, 2013; final manuscript received February 7, 2014; published online March 21, 2014. Editor: Nigel M. Sammes.

J. Fuel Cell Sci. Technol 11(4), 041006 (Mar 21, 2014) (6 pages) Paper No: FC-13-1060; doi: 10.1115/1.4026933 History: Received June 03, 2013; Revised February 07, 2014; Accepted February 18, 2014

Thermal, electrical, and electrocatalytical properties of the oxygen deficient La0.5Sr0.2TiO2.95 perovskite are studied in relation to their possible use as solid oxide fuel cell (SOFC) anode material. La0.5Sr0.2TiO2.95 is chemically stable under air and reduced atmosphere. Its thermal expansion coefficient is close to that of yttrium-stabilized zirconia (YSZ) under air and Ar/H2 (5%). No significant chemical expansion or contraction of La0.5Sr0.2TiO2.95 are observed between air and reduced atmosphere. La0.5Sr0.2TiO2.95 material has an electrical conductivity at 800 °C of 1 S cm−1 under moist hydrogen (H2/H2O (3%)), reaching 10 S cm−1 when LSTO is prereduced under Ar/H2(5%). The polarization resistance of La0.5Sr0.2TiO2.95 at 800 °C under moist hydrogen is about 1.5 Ω cm2, a value which has been obtained when including a thin CGO buffer layer between the dense YSZ electrolyte and the porous electrode.

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Figures

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Fig. 1

XRD patterns of La0.5Sr0.2TiO2.95 recorded at room temperature after the thermal cycles performed under air (a) and low oxygen partial pressure (b) and (c)

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Fig. 2

XRD spectra on LSTO (black spectrum) and LSTO/8YSZ mixing after the thermal treatments performed under air (1300 °C) and then under Ar/H2 flow (red spectrum)

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Fig. 3

Sintering shrinkage of La0.5Sr0.2TiO2.95 under air

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Fig. 4

Thermal expansion of La0.5Sr0.2TiO2.95 under air

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Fig. 5

Arrhenius plot of the dc conductivity of La0.5SrTiO3-δ recorded under wet H2 (H2/H2O; 97%:3%) (1) after sintering under air (red curve), (2) after an initial prereduction step performed at 800 °C for 12 h under pure H2 (black curve)

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Fig. 6

SEM photograph of a half-cell with La0.5Sr0.2TiO2.95 as an anode, CGO as an interlayer, and 8YSZ as an electrolyte

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Fig. 7

Arrhenius plots of ASR measured on symmetrical LSTO/CGO/8YSZ/CGO/LSTO cells under wet (•) and dry hydrogen (▪)

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