Improvement of thermal cycle characteristics of a planar-type solid oxide fuel cell by using ceramic fiber as sealing material

Taniguchi, Shunsuke; Kadowaki, Masataka; Yasuo, Takashi; Akiyama, Yukinori; Miyake, Yasuo; Nishio, Koji

doi:10.1016/s0378-7753(00)00405-5

Cited by 74 publications

(34 citation statements)

References 2 publications

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“…Solid oxide fuel cells (SOFCs) provide advantages of high energy conversion efficiency, such as heat utilization and ability to use a variety of fuels, due to their high operating temperature in the range between 800 and 1000 • C. [1][2][3] An SOFC consists of three essential components: a porous cathode, a dense electrolyte and a porous anode. The most commonly used materials are lanthanum strontium manganite as cathode, yttria stabilized zirconia (YSZ) as the electrolyte and Ni-YSZ cermet as anode.…”

Section: Introductionmentioning

confidence: 99%

Microstructure and property evaluation of barium aluminosilicate glass–ceramic sealant for anode-supported solid oxide fuel cell

Ghosh

Kundu

Sharma

et al. 2008

Journal of the European Ceramic Society

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Section: Introductionmentioning

confidence: 99%

Microstructure and property evaluation of barium aluminosilicate glass–ceramic sealant for anode-supported solid oxide fuel cell

Ghosh

Kundu

Sharma

et al. 2008

Journal of the European Ceramic Society

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“…1 [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19]. These seals must function at high [3].…”

Section: Motivation and Objectivesunclassified

Innovative Self-Healing Seals for Solid Oxide Fuel Cells (SOFC)

Singh¹

2012

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Executive SummarySolid oxide fuel cell (SOFC) technology is critical to several national initiatives. Solid State Energy Conversion Alliance (SECA) addresses the technology needs through its comprehensive programs on SOFC. A reliable and cost-effective seal that works at high temperatures is essential to the long-term performance of the SOFC for 40,000 hours at 800°C. Consequently, seals remain an area of highest priority for the SECA program and its industry teams. An innovative concept based on self-healing glasses was advanced and successfully demonstrated through seal tests for 3000 hours and 300 thermal cycles to minimize internal stresses under both steady state and thermal transients for making reliable seals for the SECA program. The self-healing concept requires glasses with low viscosity at the SOFC operating temperature of 800°C but this requirement may lead to excessive flow of the glass in areas forming the seal. To address this challenge, a modification to glass properties by addition of particulate fillers is pursued in the project. The underlying idea is that a non-reactive ceramic particulate filler is expected to form glass-ceramic composite and increase the seal viscosity thereby increasing the creep resistance of the glass-composite seals under load. The objectives of the program are to select appropriate filler materials for making glass-composite, fabricate glass-composites, measure thermal expansion behaviors, and determine stability of the glass-composites in air and fuel environments of a SOFC. Self-healing glass-YSZ composites are further developed and tested over a longer time periods under conditions typical of the SOFCs to validate the long-term stability up to 2000 hours. The new concepts of glass-composite seals, developed and nurtured in this program, are expected to be cost-effective as these are based on conventional processing approaches and use of the inexpensive materials. DE-09FE001390 -Innovative Self-Healing Seals for Solid Oxide Fuel Cells (SOFC) SinghUniversity of Cincinnati 2 Motivation and ObjectivesSolid oxide fuel cell (SOFC) technology is critical to National Energy Security and Energy Independence, and at the same time to protect our environment [1, 2]. SECA (Solid State Energy Conversion Alliance) initiatives address these needs through its comprehensive programs [1, 2]. Among the many fuel cell technologies, the SOFC functions at much higher temperatures of 650-900° C and offers unique advantages of utilization of the more abundant fossil-derived fuels (hydrocarbons) as well as hydrogen. Additionally, much higher efficiencies than the low temperature fuel cell are possible for the SOFC when integrated with the combined cycle utilizing the waste heat. Reliable seals are essential to the long-term performance, cost, and reliability of the SOFC because a leaky seal will degrade cell performance and lead to wastage of fuels in an operating fuel cell stack. Consequently, the SECA program has recognized the Seals for SOFC as an important technology area that requires p...

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“…(52) Sanyo tested ferritic steels and obtained good thermal cycling results. (53) Compared with Cr 5Fe 1Y 2 O 3 the advantages of ferritic steels are the lower cost of the material, the easier processing and fabrication of components, weldability and the fitting thermal expansion with the anode substrate (Figure 7.5).…”

Section: Ferritic Steelsmentioning

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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Improvement of thermal cycle characteristics of a planar-type solid oxide fuel cell by using ceramic fiber as sealing material

Cited by 74 publications

References 2 publications

Microstructure and property evaluation of barium aluminosilicate glass–ceramic sealant for anode-supported solid oxide fuel cell

Microstructure and property evaluation of barium aluminosilicate glass–ceramic sealant for anode-supported solid oxide fuel cell

Innovative Self-Healing Seals for Solid Oxide Fuel Cells (SOFC)

Low Temperature Cathode Supported Electrolytes

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