Spinel and Perovskite Functional Layers Between Plansee Metallic Interconnect (Cr-5 wt % Fe-1 wt % Y[sub 2]O[sub 3]) and Ceramic (La[sub 0.85]Sr[sub 0.15])[sub 0.91]MnO[sub 3] Cathode Materials for Solid Oxide Fuel Cells

Larring, Yngve; Norby, Truls

doi:10.1149/1.1393891

Cited by 201 publications

(114 citation statements)

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“…De entre todas las espinelas libres de Cr, se considera que el material de revestimiento (Mn,Co) 3 O 4 , es el candidato más prometedor para utilizarse como interconector en una SOFC. En trabajos previos, se ha realizado un estudio sobre la aleación Plansee Ducrolloy (Cr-5 %Fe-1 %Y 2 O 3 ), aplicando una capa de la espinela (Mn,Co) 3 O 4 , obteniéndose como resultado la significativa reducción de la migración de Cr, así como la reducción de la ASR en 10000 h tan baja como 0.024 mΩ.cm 2 , utilizando como pasta de contacto LSM y LSC 53 . Algunos investigadores han utilizado el revestimiento MnCo 2 O 4 sobre acero ferrítico AISI 430, mediante compactación mecánica y calentamiento 54 .…”

Section: Avances En El Desarrollo De Interconectores Metálicos De Celunclassified

Avances en el desarrollo de interconectores metálicos de celdas SOFC

Alvarado-Flores¹

2013

Bol. Soc. Esp. Ceram. Vidr.

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INTRODUCCIÓNLas celdas de combustible son dispositivos de conversión de energía que producen electricidad de forma directa a partir de un combustible gaseoso por combinación electroquímica del combustible con un oxidante. La tecnología de las celdas de combustible de óxido sólido (SOFC), se ha convertido en un método cada vez más atractivo para la generación de energía, debido a sus bajas emisiones, flexibilidad en el combustible y alta eficiencia en comparación con los sistemas tradicionales de conversión de energía. Las principales aplicaciones de las celdas SOFC son: sistema estacionario de generación de energía, servir como unidad de potencia auxiliar (APU) y aplicaciones militares. La alta temperatura de funcionamiento en este tipo de celda, comparada a otros tipos de celdas de combustible (PEM, AFC, PAFC), las hace ideales para aplicarse en ciclos combinados SOFC/turbina de gas (GT), y así obtener una eficiencia entre 70-80 % 1 . El mecanismo fundamental del funcionamiento en una celda SOFC, es la oxidación de hidrógeno y otros combustibles en el ánodo, y la reducción de oxígeno en el cátodo, para crear una diferencia de potencial entre los dos electrodos. En función del combustible empleado, los productos de reacción pueden ser agua y CO 2 . La energía química se libera tanto en energía eléctrica, como en forma de calor a causa de las polarizaciones y pérdidas óhmicas 2 . Una celda SOFC, está compuesta de un electrolito, un ánodo y un cátodo. El electrolito, es un sólido cerámico no poroso, generalmente de ZrO 2 estabilizada con Y 2 O 3 (YSZ). La celda SOFC, opera a una temperatura entre 600 y1000 ºC, donde el electrolito cerámico es un conductor de iones de oxígeno, O 2-, pero no un conductor de electrones. La alta temperatura de operación, presenta algunas ventajas como minimizar las pérdidas de polarización y tolerancia del catalizador al envenenamiento por las impurezas en el combustible 3,4 . Generalmente, el ánodo está fabricado del cermet níquel-circona estabilizada con itria (Ni-YSZ) y el cátodo es un conductor electrónico tipo perovskita de Sr dopado con el cermet LaMnO 3 (LSM), además de otros materiales con estructura perovskita. EL INTERCONECTOR EN UNA CELDA SOFCIndividualmente, una celda SOFC, puede producir un voltaje o potencial alrededor de 1 V en circuito abierto El interés en las celdas de combustible de óxido sólido (SOFC), se deriva de su alta eficiencia y la capacidad de tener un bajo nivel de emisiones contaminantes, en comparación con los métodos tradicionales de producción de energía. Los interconectores, son parte crítica del ordenamiento de una celda SOFC, debido a que conecta en serie las celdas y además, separa el aire u oxígeno (cátodo) del combustible (ánodo). Por lo tanto, los requisitos del interconector son muy exigentes, por ejemplo, es necesario mantener conductividad eléctrica elevada, óptima estabilidad tanto en atmósferas reductoras como oxidantes y el coeficiente de expansión térmica (TEC), debe ser compatible con los otros componentes cerámicos de la celda SOFC. Est...

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Section: Avances En El Desarrollo De Interconectores Metálicos De Celunclassified

Avances en el desarrollo de interconectores metálicos de celdas SOFC

Alvarado-Flores¹

2013

Bol. Soc. Esp. Ceram. Vidr.

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“…In all cases where alkaline earth-containing contact material was used, the formation of chromates was observed (45,59,67,87,88) leading to progressive decomposition of the perovskite material. A detrimental failure due to strong interface reaction was found for the alkaline earth-rich high-temperature superconductors like Bi 2 Sr 2 CuO 6+x .…”

Section: Contact Materialsmentioning

confidence: 99%

Low Temperature Cathode Supported Electrolytes

Anderson¹,

Doğan²,

Petrovsky³

2002

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This project has three main goals: Thin Films Studies, Preparation of Graded Porous Substrates and Basic Electrical Characterization and testing of Planar Single Cells.This period has continued to address the problem of making dense ½ to 5µm thick dense layers on porous substrates (the cathode LSM).Our current status is that we are making structures of 2-5cm 2 in area, which consist of either dense YSZ or CGO infiltrated into a 2-5µm thick 50% porous layer made of either nanoncrystalline CGO or YSZ powder. This composite structure coats a macroporous cathode or anode; which serves as the structural element of the bi-layer structure. These structures are being tested as SOFC elements.A number of structures have been evaluated both as symmetrical and as button cell configuration.Results of this testing indicates that the cathodes contribute the most to cell losses for temperatures below 750°C.In this investigation different cathode materials were studied using impedance spectroscopy of symmetric cells and IV characteristics of anode supported fuel cells. (SSCF). A new technique for filtering the Fourier transform of impedance data was used to increase the sensitivity of impedance analysis.By creating a filter specifically for impedance spectroscopy the resolution was increased. The filter was tailored to look for specific circuit elements like R//C, Warburg, or constant phase elements. As many as four peaks can be resolved using the filtering technique on symmetric cells. It may be possible to relate the different peaks to material parameters, like the oxygen exchange coefficient. The cathode grouped in order from lowest to highest ASR is LSCF < PSCF < SSCF < YSCF < LSM. The button cell results agree with this ordering indicating that this is an important tool for use in developing our understanding of electrode behavior in fuel cells. 2 LOW TEMPERATURE CATHODE SUPPORTED ELECTROLYTESReport for Period October 1, 2001 to March 31, 2002 Fuel cell design by itself is a complicated problem. Many particular directions need to be analyzed and solved to get the final result, but there is no doubt that the combination of the materials involved in this design is a key issue. During the past few years there has been an effort promoted by the US Department of Energy (SECA Program) to lower the operating temperature of solid oxide fuel cells. As a result, the solid oxide fuel cell activities at the Electronic Materials Applied Research Center (EMARC) of the University of Missouri-Rolla (UMR) have been focused on the fabrication of thin (0.5 to 5µm thick), dense electrolyte layers of either zirconia or ceria. The route that has been taken is to deposit a polymer precursor solution, which contain the cations of the chosen electrolyte onto a substrate and subsequently convert the resulting polymeric films into dense layers by thermal treatment.The efficiency of oxygen ion permeation through the SOFC structure is obviously a main issue [1]. Different components influence this ion permeation [2]. First of all, for the electrolyte...

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“…[1][2][3][4] To overcome these problems, relatively dense materials including La-based perovskites, [5][6][7][8][9] Mn-based spinels, [9][10][11] oxidation-resistant systems of MAlCrYO (M represents a metal, e.g. Co, Mn and/or Ti) 12) and reactive element oxides (REOs) [13][14][15] are applied on the ferritic stainless steels as protective and conducting coatings.…”

Section: Introductionmentioning

confidence: 99%

Interface Reactions between Conductive Ceramic Layers and Fe-Cr Steel Substrates in SOFC Operating Conditions

Przybylski

Brylewski

2011

Mater. Trans.

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To improve contact resistance and protect the cathode from chromium poisoning, perovskite (La,Sr)CrO 3 , (La,Sr)CoO 3 and spinel MnCo 2 O 4 coatings were applied onto the surfaces of Fe-25Cr (DIN 50049) steel by means of the screen-printing method. The oxidation process of the coated steels under cyclic-oxidation conditions showed high compactness of the protective layer, good adhesion to the metal substrate, as well as acceptable area specific resistance level for SOFC metallic interconnect materials, which was the result of the structural modification of the coating/steel interface reaction, i.e. the formation of an intermediate, chromia-rich multilayer between the conductive coating and the metal substrate. The cross-sectional morphology and nanostructure of interface products formed during long-term thermal oxidation in air and the H 2 /H 2 O gas mixture at 1073 K were characterized using SEM-EDS and conventional TEM-SAD. Cr-vaporization tests showed that the perovskite and spinel coatings may play the role of barriers that effectively decrease the volatilization rate of chromia species.

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Spinel and Perovskite Functional Layers Between Plansee Metallic Interconnect (Cr-5 wt % Fe-1 wt % Y[sub 2]O[sub 3]) and Ceramic (La[sub 0.85]Sr[sub 0.15])[sub 0.91]MnO[sub 3] Cathode Materials for Solid Oxide Fuel Cells

Cited by 201 publications

References 8 publications

Avances en el desarrollo de interconectores metálicos de celdas SOFC

Avances en el desarrollo de interconectores metálicos de celdas SOFC

Low Temperature Cathode Supported Electrolytes

Interface Reactions between Conductive Ceramic Layers and Fe-Cr Steel Substrates in SOFC Operating Conditions

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