Ln1?xSrxCoO3 (Ln=Gd, Pr) as a cathode for intermediate-temperature solid oxide fuel cells?

Rossignol, Cécile; Ralph, J. M.; Bae, Joongmyeon; Vaughey, John T.

doi:10.1016/j.ssi.2004.09.021

Cited by 90 publications

(51 citation statements)

References 6 publications

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“…However, there was a significant decrease in the cell voltage for the first 20 h testing, which is ascribed to an increased ASR of the cell, as shown in Figure 8. The decrease was likely attributed to a microstructure rearrangement at the cathode/electrolyte interface, and a similar trend has also been observed with symmetrical Gd 1 -x Sr x CoO 3 or Pr 1 -x Sr x CoO 3 on YSZ electrolyte with GDC layer [18,28]. Though no discernable change was detected by SEM in our study, microstructure and chemical composition related cation diffusion from cathode to interface should also be taken into account.…”

Section: Single Cell Performancesupporting

confidence: 85%

Optimisation and Evaluation of La_0.6Sr_0.4CoO_3 – δ Cathode for Intermediate Temperature Solid Oxide Fuel Cells

et al. 2009

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In this work, La0.6Sr0.4CoO3 – δ/Ce1 – xGdxO2 – δ (LSC/GDC) composite cathodes are investigated for SOFC application at intermediate temperatures, especially below 700 °C. The symmetrical cells are prepared by spraying LSC/GDC composite cathodes on a GDC tape, and the lowest polarisation resistance (Rp) of 0.11 Ω cm2 at 700 °C is obtained for the cathode containing 30 wt.‐% GDC. For the application on YSZ electrolyte, symmetrical LSC cathodes are fabricated on a YSZ tape coated on a GDC interlayer. The impact of the sintering temperature on the microstructure and electrochemical properties is investigated. The optimum temperature is determined to be 950 °C; the corresponding Rp of 0.24 Ω cm2 at 600 °C and 0.06 Ω cm2 at 700 °C are achieved, respectively. An YSZ‐based anode‐supported solid oxide fuel cell is fabricated by employing LSC/GDC composite cathode sintered at 950 °C. The cell with an active electrode area of 4 × 4 cm2 exhibits the maximum power density of 0.42 W cm–2 at 650 °C and 0.54 W cm–2 at 700 °C. More than 300 h operating at 650 °C is carried out for an estimate of performance and degradation of a single cell. Despite a decline at the beginning, the stable performance during the later term suggests a potential application.

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Section: Single Cell Performancesupporting

confidence: 85%

Optimisation and Evaluation of La_0.6Sr_0.4CoO_3 – δ Cathode for Intermediate Temperature Solid Oxide Fuel Cells

et al. 2009

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“…For example, doped ceria can prevent solid state reactions between YSZ and LSCo (La 1Àx Sr x CoO 3 ). 43,[51][52][53] Ceria could also enhance performance through enhanced catalytic activity, since it is known to be a very good oxidation catalyst. 54,55 Another implication of our results is related to low-temperature SOFCs.…”

Section: Discussionmentioning

confidence: 99%

Effect of the Ionic Conductivity of the Electrolyte in Composite SOFC Cathodes

Vohs

Gorte

2011

J. Electrochem. Soc.

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Solid oxide fuel cell (SOFC) cathodes were prepared by infiltration of 35 wt % La0.8Sr0.2FeO3 (LSF) into porous scaffolds of three, zirconia-based electrolytes in order to determine the effect of the ionic conductivity of the electrolyte material on cathode impedances. The electrolyte scaffolds were 10 mol % Sc2O3-stabilized zirconia (ScSZ), 8 mol % Y2O3-stabilized zirconia (YSZ), and 3 mol % Y2O3- 20 mol % Al2O3-doped zirconia (YAZ), prepared by tape casting with graphite pore formers. Each electrolyte scaffold was 65% porous, with identical pore structures as determined by scanning electron microscopy (SEM). Both symmetric cells and fuel cells were prepared and tested between 873 and 1073 K, using LSF composites that had been calcined to 1123 or 1373 K. Literature values for the electrolyte conductivities were confirmed using the ohmic losses from the impedance spectra. The electrode impedances decreased with increasing electrolyte conductivity, with the dependence being between to the power of 0.5 and 1.0, depending on the operating temperature and LSF calcination temperature.

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“…[91] The reason LSCo is not widely applied is that it reacts rapidly with YSZ at 1 000 8C, the minimum sintering temperature for YSZ, to form insulating La 2 Zr 2 O 7 and SrZrO 3 phases. [38,92] There has been some success in stabilizing LSCo cathodes by incorporating layers of doped ceria between LSCo and YSZ in order to avoid these reactions; [93,94] but this approach has not been entirely successful. [95] Even if the reactivity problems could be solved, LSCo has a large CTE mismatch with YSZ that would make its application difficult.…”

Section: Lsco-ysz Electrodesmentioning

confidence: 99%

High‐Performance SOFC Cathodes Prepared by Infiltration

2009

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Improved cathodes are required for low‐temperature operation of solid‐oxide fuel cells (SOFCs). Recent work has shown that electrode fabrication and modification by infiltration of active components into a porous scaffold can result in outstanding electrochemical performance. In this paper we review the literature on this new approach for cathode preparation and discuss the insights that this work has provided for understanding the relationships between the materials properties, electrochemical performance, and electrode stability.

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Ln1?xSrxCoO3 (Ln=Gd, Pr) as a cathode for intermediate-temperature solid oxide fuel cells?

Cited by 90 publications

References 6 publications

Optimisation and Evaluation of La_0.6Sr_0.4CoO_3 – δ Cathode for Intermediate Temperature Solid Oxide Fuel Cells

Optimisation and Evaluation of La_0.6Sr_0.4CoO_3 – δ Cathode for Intermediate Temperature Solid Oxide Fuel Cells

Effect of the Ionic Conductivity of the Electrolyte in Composite SOFC Cathodes

High‐Performance SOFC Cathodes Prepared by Infiltration

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Ln1?xSrxCoO3 (Ln=Gd, Pr) as a cathode for intermediate-temperature solid oxide fuel cells?

Cited by 90 publications

References 6 publications

Optimisation and Evaluation of La0.6Sr0.4CoO3 – δ Cathode for Intermediate Temperature Solid Oxide Fuel Cells

Optimisation and Evaluation of La0.6Sr0.4CoO3 – δ Cathode for Intermediate Temperature Solid Oxide Fuel Cells

Effect of the Ionic Conductivity of the Electrolyte in Composite SOFC Cathodes

High‐Performance SOFC Cathodes Prepared by Infiltration

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Product

Resources

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Optimisation and Evaluation of La_0.6Sr_0.4CoO_3 – δ Cathode for Intermediate Temperature Solid Oxide Fuel Cells

Optimisation and Evaluation of La_0.6Sr_0.4CoO_3 – δ Cathode for Intermediate Temperature Solid Oxide Fuel Cells