Dopants to enhance SOFC cathodes based on Sr-doped LaFeO3 and LaMnO3

Bidrawn, Fred; Kim, Guntae; Aramrueang, N.; Vohs, John M.; Gorte, Raymond J.

doi:10.1016/j.jpowsour.2009.08.034

Cited by 107 publications

(127 citation statements)

References 40 publications

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“…Because the performance of infiltrated electrodes depends on the calcination temperature, 43,49,50 symmetric cells were also prepared with the LSF calcined to 1373 K for 4 h. Impedance spectra were again obtained in air from 873 to 973 K, with the spectra at 973 K shown in Fig. 7.…”

Section: Resultsmentioning

confidence: 99%

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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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Section: Resultsmentioning

confidence: 99%

“…Obviously, the structure of the composite is still important and one can only take advantage of a materials ionic conductivity if it is possible for that material to transport ions to the electrolyte. 49 …”

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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“…Based on an earlier work, the porous layers were ϳ65% porous. 25 The cathodes of the fuel cells were synthesized by adding LSM ͑La 0.8 Sr 0.2 MnO 3 ͒ to one of the porous layers by either aqueous infiltration or electrodeposition. With aqueous infiltration, a solution with the correct stoichiometric mixture of La, Sr, and Mn nitrate salts was added to the porous YSZ scaffold and then heated to 723 K to remove the water and decompose the nitrates.…”

Section: Methodsmentioning

confidence: 99%

“…25 The final calcination temperature for the anode was 973 K. Cells were then mounted onto an alumina tube and tested at 973 K with the anode in flowing, humidified ͑3% H 2 O͒ H 2 and the cathode simply exposed to the laboratory air. Impedance spectra and voltage-current density ͑V-i͒ polarization curves were measured using a Gamry Instruments potentiostat.…”

Section: Methodsmentioning

confidence: 99%

Fabrication of LSM–YSZ Composite Electrodes by Electrodeposition

Bidrawn¹,

Vohs²,

Gorte³

2010

J. Electrochem. Soc.

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Composites of Sr-doped LaMnO 3 ͑LSM͒ and yttria-stabilized zirconia ͑YSZ͒ were prepared by sequential electrodeposition of La and Mn species from nitrate salts in Dimethyl Sulfoxide ͑DMSO͒ into a porous, carbon-coated YSZ substrate, followed by the infiltration of Sr͑NO 3 ͒ 2 . The La and Mn species were uniformly deposited throughout the depth of a 50 m porous layer to the interface with a dense YSZ electrolyte. The LSM perovskite phase was formed after heating to 1373 K. Solid oxide fuel cell cathodes prepared by single-step electrodeposition showed similar performance to LSM-YSZ electrodes prepared by wet impregnation using many steps.

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“…The La 0.8 Sr 0.2 Mn0 3 gives a good combination of electronic conductivity and expansion coefficient matching, and is now available commercially for SOFC applications. Higher conductivity can be obtained at higher dopant levels, but the expansion coefficient then becomes too high [12][13][14][15][16][17][18][19][20] . There are several routes to synthesize perovskite structured materials.…”

Section: Introductionmentioning

confidence: 99%

Synthesis and characterization of La1-xSr xMnO3±δ powders obtained by the polymeric precursor route

et al. 2011

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Polycrystalline strontium-doped lanthanum manganite (LSM) powders with 0.15, 0.22, and 0.30 mol % Sr were synthesized by the polymeric precursor route using a molar ratio of 3:1 citric acid and metal cations. The powders were characterized by Fourier transform infrared spectroscopy, thermal analysis, high-temperature X-ray diffraction to determine the crystalline perovskite phase and crystallite sizes, scanning electron microscopy for the morphological analysis, nitrogen adsorption to determine the specific surface area, and laser scattering to evaluate the particle size distribution. The LSM perovskite-type oxides containing intermediate 0.22 mol % Sr were found to exhibit a tendency to decrease in crystallite size and increase in specific surface area and, when calcined at 700-900 °C exhibited a pure phase of perovskite, had a crystallite size of about 17-20 nm and a specific surface area for 900 °C of 34.3 m 2 .g -1.

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Dopants to enhance SOFC cathodes based on Sr-doped LaFeO3 and LaMnO3

Cited by 107 publications

References 40 publications

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

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

Fabrication of LSM–YSZ Composite Electrodes by Electrodeposition

Synthesis and characterization of La1-xSr xMnO3±δ powders obtained by the polymeric precursor route

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