Properties and Performance of SOFCs Produced on a Pre‐Pilot Plant Scale

The degradation of anode-supported cells was studied over 1500 h as a function of cell polarization either in air or oxygen on the cathode side. Based on impedance analysis, contributions of the anode and cathode to the increase of total resistance were assigned. Accordingly, the degradation rates of the cathode were strongly dependent on the pO 2 . Microstructural analysis of the cathode/electrolyte interface carried out after removal of the cathode showed craters on the electrolyte surface where the lanthanum strontium manganite ͑LSM͒ particles had been located. The changes of shape and size of these craters observed after testing correlated with the cell voltage degradation rates. The results can be interpreted in terms of element redistribution at the cathode/ electrolyte interface and formation of foreign phases giving rise to a weakening of local contact points of the LSM cathode and yttria-stabilized zirconia electrolyte and consequently a reduced three-phase boundary length.

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“…The cells studied here were produced in the prepilot facility at Risø according to the same procedure as described in Ref. 3.…”

Section: Methodsmentioning

confidence: 99%

Assessment of the Cathode Contribution to the Degradation of Anode-Supported Solid Oxide Fuel Cells

Hagen

Liu

Barfod

et al. 2008

J. Electrochem. Soc.

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“…The cell size has been scaled up such that cells in the size of 18x18cm 2 are routinely produced. The largest cell manufactured so far is 1250 cm 2 (1).…”

Section: Cell Development and Productionmentioning

confidence: 99%

“…This cell type is very well characterized with respect to performance and durability (2). The average ASR at 850 o C is 0.18 +/-0.03 Ωcm 2 with a degradation rate below 0.6 %/1000 h for current loads up to 1 A/cm 2 .…”

Section: Cell Development and Productionmentioning

confidence: 99%

“…Due to the very compact stack design including thin-plate metallic interconnects, a stack volume power density of 2.4 kW per litre stack volume has been obtained in crossflow configuration with hydrogen fuel at 0.35 W/cm 2 . Standard stacks have been tested successfully for more than 13000 h. Post-mortem analyses have revealed the dominating degradation mechanisms.…”

Section: Stack Development and Productionmentioning

confidence: 99%

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Solid Oxide Fuel Cell Development at Topsoe Fuel Cell A/S and Riso̸ National Laboratory

et al. 2007

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The consortium of Topsoe Fuel Cell A/S and Risø National Laboratory has up-scaled its production capacity of anodesupported cells to about 1100 per week. Stacks are based on a compact thin plate multilayer design with metallic interconnects and 12x12 cm 2 or 18x18 cm 2 foot print. Larger (500 cm 2 ) cells are currently under evaluation. Stacks have been tested successfully for more than 13000 h. Several 50 or 75 cell stacks in the 1+ kW power range have been tested successfully at a fuel utilisation of up to 92%. Multi stack modules consisting of four 75 cell stacks have been tested for more than 4000 h with pre-reformed natural gas and modules consisting of twelve stacks are under development. The degradation rate has been reduced to below 0.5% per 1000 h, especially by improvement of metal alloy interconnects and coatings. Our SOFC program comprises development of next generation cells with metallic support for operation at lower temperature. In this case porous ferritic steel is used as a cheap, ductile, robust cell support and the electrolyte is based on scandiastabilized zirconia with improved durability. Furthermore, the metal supported cells offer a significantly improved tolerance towards redox cycling. In collaboration with Wärtsilä, a 24-stack prototype based on natural gas is being tested. For methanol based systems the methanol is methanated upstream the anode using a newly developed proprietary Haldor Topsoe catalyst. The range of fuels have further been extended to include ethanol and coal syngas by development of a new coke resistant catalyst suitable for future SOFC technology.

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“…Detailed SOFC start-up procedure can be found elsewhere [15] [16]. In a pressurized system, the stack pressure and temperature are increased simultaneously.…”

Section: System Operation Modes and Dynamic Responsesmentioning

confidence: 99%

Techno-Economic Feasibility of Highly Efficient Cost-Effective Thermoelectric-SOFC Hybrid Power Generation Systems

Zhang¹,

Yamanis²

2007

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Properties and Performance of SOFCs Produced on a Pre‐Pilot Plant Scale

Cited by 46 publications

References 4 publications

Assessment of the Cathode Contribution to the Degradation of Anode-Supported Solid Oxide Fuel Cells

Assessment of the Cathode Contribution to the Degradation of Anode-Supported Solid Oxide Fuel Cells

Solid Oxide Fuel Cell Development at Topsoe Fuel Cell A/S and Riso̸ National Laboratory

Techno-Economic Feasibility of Highly Efficient Cost-Effective Thermoelectric-SOFC Hybrid Power Generation Systems

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