LSM-Infiltrated Solid Oxide Fuel Cell Cathodes

Sholklapper, Tal Z.; Lu, Chun; Jacobson, Craig P.; Visco, Steven J.; Jonghe, Lutgard C. De

doi:10.1149/1.2206011

Cited by 136 publications

(112 citation statements)

References 17 publications

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“…The microstructure that the infiltration method produces 5 , and its relation to the stability of the cathode is first characterized by scanning electron microscope. From the FIB cross-sectional SEM image, Figure 1, it is evident that the infiltration method produces a well-connected network and rafts of nanoparticulate LSM, confined nearly exclusively to the pore walls of the SSZ cathode backbone, providing a sufficient percolation path for electrons to the majority of the oxygen reduction reaction (ORR) sites.…”

Section: Resultsmentioning

confidence: 99%

“…Nanoparticulate catalysts may be infiltrated into already formed SOFC electrodes to enhance electrode performance [1][2][3][4] , and new electrode designs have been devised utilizing continuous nanoparticulate networks or connected nanoparticle rafts [4][5][6][7][8][9] . In these electrode designs, the nanoparticulates not only serve as reaction sites, but also provide an electron pathway from the current collector to the individual reaction sites.…”

Section: Introductionmentioning

confidence: 99%

“…Nanoparticle-infiltrated porous ZrO 2 -based electrodes were prepared in a single processing step 5 ; the cells showed an adequate initial performance at 650°C, but their extended stability was not examined. Further evaluation of similar nanoparticulate-LSM infiltrated, porous SSZ (scandiastabilized zirconia) electrodes proved, for the first time, their functional stability for over 500 hours of operation at 650°C.…”

Section: Introductionmentioning

confidence: 99%

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Synthesis and Stability of a Nanoparticle-Infiltrated Solid Oxide Fuel Cell Electrode

Sholklapper

Radmilović

Jacobson

et al. 2007

Electrochem. Solid-State Lett.

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120

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Synthesis and Stability of a Nanoparticle-Infiltrated Solid Oxide Fuel Cell Electrode

Sholklapper

Radmilović

Jacobson

et al. 2007

Electrochem. Solid-State Lett.

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120

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“…[27][28][29][30][31] Figure 11. SEM image of FIB corss-sectioned nanoparticulate LSM-infiltrated cathode.…”

Section: Stabilitymentioning

confidence: 99%

Nanostructured Solid Oxide Fuel Cell Electrodes

2007

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The ability of Solid Oxide Fuel Cells (SOFC) to directly and efficiently convert the chemical energy in hydrocarbon fuels to electricity places the technology in a unique and exciting position to play a significant role in the clean energy revolution. In order to make SOFC technology cost competitive with existing technologies, the operating temperatures have been decreased to the range where costly ceramic components may be substituted with inexpensive metal components within the cell and stack design.However, a number of issues have arisen due to this decrease in temperature: decreased electrolyte ionic conductivity, cathode reaction rate limitations, and a decrease in anode contaminant tolerance.While the decrease in electrolyte ionic conductivities has been countered by decreasing the electrolyte thickness, the electrode limitations have remained a more difficult problem. Nanostructuring SOFC electrodes addresses the major electrode issues.The infiltration method used in this dissertation to produce nanostructure SOFC 2 electrodes creates a connected network of nanoparticles; since the method allows for the incorporation of the nanoparticles after electrode backbone formation, previously incompatible advanced electrocatalysts can be infiltrated providing electronic conductivity and electrocatalysis within well-formed electrolyte backbones. Furthermore, the method is used to significantly enhance the conventional electrode design by adding secondary electrocatalysts. Performance enhancement and improved anode contamination tolerance are demonstrated in each of the electrodes. Additionally, cell processing and the infiltration method developed in conjunction with this dissertation are reviewed.

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“…The objective of this project is to determine if the stability and/or catalytic properties (or the performance) of porous LSCF cathodes can be further enhanced by infiltration of other catalytically active materials, to investigate the effect of surface modification of porous LSCF (by infiltration of another catalyst) on the area-specific polarization resistance, and to evaluate stability of infiltrated cathodes under typical SOFC testing conditions [8].…”

Section: Executive Summarymentioning

confidence: 99%

Functionally Graded Cathodes for Solid Oxide Fuel Cells

Yang¹,

Liu²,

Wang³

et al. 2008

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The main objective of this DOE project is to demonstrate that the performance and long-term stability of the state-of-the-art LSCF cathode can be enhanced by a catalytically active coating (e.g., LSM or SSC).We have successfully developed a methodology for reliably evaluating the intrinsic surface catalytic properties of cathode materials. One of the key components of the test cell is a dense LSCF film, which will function as the current collector for the electrode material under evaluation to eliminate the effect of ionic and electronic transport. Since it is dense, the effect of geometry would be eliminated as well.From the dependence of the electrode polarization resistance on the thickness of a dense LSCF electrode and on partial pressure of oxygen, we have confirmed that the surface catalytic activity of LSCF limits the performances of LSCF-based cathodes. Further, we have demonstrated, using test cells of different configurations, that the performance of LSCF-based electrodes can be significantly enhanced by infiltration of a thin film of LSM or SSC. In addition, the stability of LSCF-based cathodes was also improved by infiltration of LSM or SSC.While the concept feasibility of the electrode architecture is demonstrated, many details are yet to be determined. For example, it is not clear how the surface morphology, composition, and thickness of the coatings change under operating conditions over time, how these changes influence the electrochemical behavior of the cathodes, and how to control the microscopic details of the coatings in order to optimize the performance. The selection of the catalytic materials as well as the detailed microstructures of the porous LSCF and the catalyst layer may critically impact the performance of the proposed cathodes.Further, other fundamental questions still remain; it is not clear why the degradation rates of LSCF cathodes are relatively high, why a LSM coating improves the stability of LSCF cathodes, which catalysts would be most effective for LSCF, and how to achieve further enhancement of the performance and stability of SOFC cathodes.4

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LSM-Infiltrated Solid Oxide Fuel Cell Cathodes

Cited by 136 publications

References 17 publications

Synthesis and Stability of a Nanoparticle-Infiltrated Solid Oxide Fuel Cell Electrode

Synthesis and Stability of a Nanoparticle-Infiltrated Solid Oxide Fuel Cell Electrode

Nanostructured Solid Oxide Fuel Cell Electrodes

Functionally Graded Cathodes for Solid Oxide Fuel Cells

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