Optimized Lanthanum Ferrite-Based Cathodes for Anode-Supported SOFCs

Simner, Steven P.; Bonnett, Jeff F.; Canfield, Nathan L.; Meinhardt, Kerry D.; Sprenkle, Vince L.; Stevenson, Jeffry W.

doi:10.1149/1.1483156

Cited by 179 publications

(112 citation statements)

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“…This increased ohmic loss is likely due to insufficient weight loading of the perovskite within the electrode. The most prominent effect of shorting was on the nonohmic impedances, which decreased from 2.1 to ϳ0.6 ⍀ cm 2 , with most of this coming from the LSM cathodes. 35 To demonstrate that it was not simply the silver paste that was acting as the cathode, we also tested a cell that was identical to the ones for which data are shown in Fig.…”

Section: Resultsmentioning

confidence: 97%

“…6 and 7, except that no LSM was added on the cathode side. At 973 K, this cell exhibited an ohmic loss of 2.5 ⍀ cm 2 and an impedance that was independent of current density. Assuming 2 ⍀ cm 2 of the ohmic losses come from the empty YSZ scaffold, the conductivity of the 50 m porous YSZ is calculated to be 0.0025 S/cm.…”

Section: Resultsmentioning

confidence: 99%

“…[1][2][3][4][5][6] The primary reasons for using LSM are that LSM has a similar coefficient of thermal expansion as YSZ and that LSM and YSZ are relatively unreactive, so mixed powders can be fired to 1473 K without causing a significant level of solid-state reaction. 7 The ability to calcine the mixed powders to high temperatures is particularly important because it greatly simplifies the fabrication of LSM-YSZ electrodes.…”

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confidence: 99%

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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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Section: Resultsmentioning

confidence: 97%

Section: Resultsmentioning

confidence: 99%

mentioning

confidence: 99%

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Fabrication of LSM–YSZ Composite Electrodes by Electrodeposition

Bidrawn¹,

Vohs²,

Gorte³

2010

J. Electrochem. Soc.

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“…[6][7][8][9][10][11][12] The primary reason for using LSM-based cathodes is that LSM-YSZ electrodes are relatively easy to fabricate and have excellent, long-term stability. LSM-YSZ electrodes can be prepared by simply sintering the mixed powders together on YSZ electrolytes, because formation of insulating layers of La 2 Zr 2 O 7 and SrZrO 3 occurs only at very high temperatures.…”

mentioning

confidence: 99%

The Stability of LSF-YSZ Electrodes Prepared by Infiltration

Wang

Gross

Vohs

et al. 2007

J. Electrochem. Soc.

165

184

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Composite electrodes were prepared by adding 40 wt % La 0.8 Sr 0.2 FeO 3 ͑LSF͒ into porous yttria-stabilized zirconia ͑YSZ͒ and their performance was studied as a function of time and calcination temperature. X-ray diffraction ͑XRD͒ patterns of the LSF-YSZ composites indicated an expanded lattice parameter after calcination above 1523 K, suggesting that Zr reacted with the LSF to form a Zr-doped perovskite; but XRD provided no evidence for reaction between LSF and YSZ after calcination at 1373 K or after operation for 1000 h at 973 K and 700 h at 1073 K. A composite of 40 wt % La 0.8 Sr 0.2 Fe 0.9 Zr 0.1 O 3 in YSZ showed reasonable performance at 973 K, with an area-specific resistance ͑ASR͒ of 0.22 ⍀ cm 2 . Based on symmetric-cell measurements, electrodes calcined at 1123 K showed an initial ASR of 0.13 ⍀ cm 2 at 973 K but this increased linearly with time to 0.55 ⍀ cm 2 after 2500 h at 973 K. However, the ASR depended strongly on current density, decreasing dramatically under both anodic and cathodic polarization. Electrodes calcined at 1373 K showed an ASR of 2.5 ⍀ cm 2 at 973 K but this value also decreased dramatically under polarization. Scanning electron microcopy images demonstrate that aging at 973 K and calcination at 1373 K cause significant sintering of the LSF. It is therefore suggested that deactivation is caused by morphological changes, rather than solid-state reactions, with a dense layer of LSF forming over the YSZ substrate.

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“…La 1−x Sr x FeO 3 (LSFx) are a group of perovskites, which are perspective cathode materials for solid oxide fuel cells (SOFCs). In comparison to lanthanum manganites they exhibit superior performance as SOFC cathode [5,6]. Many attempts have already been made to investigate electrochemical properties and synthesis routes involving both solid state and preferred "soft chemistry" methods [7,8].…”

Section: Introductionmentioning

confidence: 99%