Effect of Cathode Microstructure on the Cathode Polarization in the Sintered Strontium-Doped Lanthanum Manganite/Yttria Stabilized Zirconia Solid Oxide Fuel Cells

Chen, A; Smith, Jeffrey D.; DeHoff, R. T.; Wachsman, E. D.; Bourne, Gerald R.; Jones, K.

doi:10.1017/s1431927608085942

Cited by 3 publications

(6 citation statements)

References 99 publications

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“…However, a fraction of the TPBs were not interconnected and could not contribute to the cell's electrochemical processes . Using similar techniques, the microstructural characteristics in the cathode, including the porosity, TPB length, surface area, and tortuosity of each phase, were correlated with cell performance …”

Section: Introductionmentioning

confidence: 99%

“…9,10,14,15 Using similar techniques, the microstructural characteristics in the cathode, including the porosity, TPB length, surface area, and tortuosity of each phase, were correlated with cell performance. 11,[16][17][18]26,27 There are two reasons why the crystallography of SOFC microstructures has not yet been explored. The first reason is application related: there is no clear path to establishing the importance of observed crystallographic features to SOFC performance, even though it is well known that surface properties are strongly coupled to crystallographic features, including oxygen surface exchange for YSZ 12 and LSM.…”

Section: Introductionmentioning

confidence: 99%

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The Orientation Distributions of Lines, Surfaces, and Interfaces around Three‐Phase Boundaries in Solid Oxide Fuel Cell Cathodes

et al. 2011

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Three‐dimensional electron backscatter diffraction was used to measure the crystallographic distribution of the electrochemically relevant triple phase boundary lines and surfaces near them in SOFC cathodes made up of a porous mixture of yttria‐stabilized zirconia and lanthanum strontium manganese oxide, both before and after mild electrochemical loading. All distributions were observed to be nearly isotropic, but non‐random textures above the detection threshold were observed. The distributions differ between the two cells, as do the phase fractions and the electrochemical history. The different distributions are interpreted as evidence that steady‐state distributions vary locally with phase fractions or that they evolve during the initial operation of the fuel cell. The rates at which triple lines, pore surfaces, and interface boundaries in the porous mixture approach a steady‐state value appear to decrease with the average amount of mass transport required to reorient that specific feature. This work provides initial insights into the crystallography of interfaces in a multiphase ceramic material.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The Orientation Distributions of Lines, Surfaces, and Interfaces around Three‐Phase Boundaries in Solid Oxide Fuel Cell Cathodes

et al. 2011

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“…This epitaxial relationship is independent of the YSZ crystal orientation. It does not change as a function of the sintering time (1–25 h at 1473 K) and sintering temperature (1473–1673 K for 1 h sintering) 21 . The inconsistency with Tricker's structural analysis is attributed to a wider range of sintering conditions being studied in this work.…”

Section: Discussionmentioning

confidence: 57%

“…4). 21 The growth constant is determined from the slope. This linear relationship was assumed for each sample sintered between 1373 and 1673 K for 1 h, because the growth constant is constant at a constant sintering temperature.…”

Section: Discussionmentioning

confidence: 99%

Characterization of Lanthanum Zirconate Formation at the A‐Site‐Deficient Strontium‐Doped Lanthanum Manganite Cathode/Yttrium‐Stabilized Zirconia Electrolyte Interface of Solid Oxide Fuel Cells

Chen

Bourne

Siebein

et al. 2008

Journal of the American Ceramic Society

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Lanthanum zirconate (LZO) formation and growth kinetics between 1273-1673 K at the A-site (La, Sr)-deficient Sr-doped lanthanum manganite (LSM)/yttrium-stabilized zirconia (YSZ) interface were studied using high-resolution transmission electron microscopy-energy-dispersive X-ray spectrometry (HRTEM-EDS). A cross-section TEM sample preparation technique was developed using a dual-beam focused ion beam and an in situ Omniprobe manipulator. The LZO pyrochlore phase was identified at the LSM/YSZ interface by TEM. The LZO is epitaxial with respect to the YSZ phase but not to the LSM phase. EDS results coupled with structural analysis suggest that La diffusion is a critical step in LZO formation. This study shows that LZO formation can occur even for A-sitedeficient LSM with a La composition of 78 mol% (o86 mol%). The activation energy for LZO formation was found to be 16878 KJ/mol. T. Gur-contributing editorThe authors would like to thank the United States Department of Energy for funding under project number DOE project DE-AC05-76RL01830 and Nextech for supplying cathode inks for use in this work.

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“…LSM satisfies most requirements for fuel cell electrodes due to its high electrical conductivity and minimum reactivity and interdiffusion [6]. A disadvantage of LSM is the lack of oxide ion conduction at working temperatures [7].…”

Section: Introductionmentioning

confidence: 99%

Thermochemistry of perovskites in the lanthanum–strontium–manganese–iron oxide system

Marinescu

Vradman

Tănăsescu

et al. 2015

Journal of Solid State Chemistry

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of Perovskites in the lanthanumstrontium-manganese-iron oxide system, Journal of Solid State Chemistry, http://dx.Abstract The enthalpies of formation from binary oxides of perovskites (ABO 3 ) based on lanthanum strontium manganite La(Sr)MnO 3 (LSM) and lanthanum strontium ferrite La(Sr)FeO 3 (LSF) and mixed lanthanum strontium manganite ferrite La(Sr)Mn(Fe)O 3 (LSMF) were measured by high temperature oxide melt solution calorimetry. Using iodometric titration, the oxygen content was derived. The perovskites with A-site cation deficiency have greater oxygen deficiency than the corresponding A-site stoichiometric series. Stability of LSMF decreases with increasing iron content. Increasing oxygen deficiency clearly destabilizes the perovskites. The results suggest an enthalpy of oxygen incorporation that is approximately independent of composition.

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Effect of Cathode Microstructure on the Cathode Polarization in the Sintered Strontium-Doped Lanthanum Manganite/Yttria Stabilized Zirconia Solid Oxide Fuel Cells

Abstract: Extended abstract of a paper presented at Microscopy and Microanalysis 2008 in Albuquerque, New Mexico, USA, August 3 – August 7, 2008

Cited by 3 publications

References 99 publications

The Orientation Distributions of Lines, Surfaces, and Interfaces around Three‐Phase Boundaries in Solid Oxide Fuel Cell Cathodes

The Orientation Distributions of Lines, Surfaces, and Interfaces around Three‐Phase Boundaries in Solid Oxide Fuel Cell Cathodes

Characterization of Lanthanum Zirconate Formation at the A‐Site‐Deficient Strontium‐Doped Lanthanum Manganite Cathode/Yttrium‐Stabilized Zirconia Electrolyte Interface of Solid Oxide Fuel Cells

Thermochemistry of perovskites in the lanthanum–strontium–manganese–iron oxide system

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