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Advances in Solid Oxide Fuel Cells II, Ceramic Engineering by Andrew Wereszczak, Edgar Lara-Curzio, Narottam P. Bansal

By Andrew Wereszczak, Edgar Lara-Curzio, Narottam P. Bansal

As a result of its many strength advantages, together with excessive electric potency and occasional environmental emissions, strong oxide gas mobile (SOFC) expertise is the topic of in depth examine and improvement efforts by way of nationwide laboratories, universities, and personal industries. In those complaints, overseas scientists and engineers current fresh technical development on materials-related facets of gas cells together with SOFC part fabrics, fabrics processing, and cell/stack layout, functionality, and balance. rising developments in electrochemical fabrics, electrodics, interface engineering, long term chemical interactions, and extra are included.This booklet is compiled of papers offered on the court cases of the thirtieth foreign convention on complex Ceramics and Composites, January 22-27, 2006, Cocoa seashore, Florida. prepared and backed through the yankee Ceramic Society and the yank Ceramic Society's Engineering Ceramics department at the side of the Nuclear and Environmental know-how department.

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Extra resources for Advances in Solid Oxide Fuel Cells II, Ceramic Engineering and Science Proceedings, Cocoa Beach

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Tt has been show that the impedance spectrum can be decont oluted into component electrode processes [7,8]. The increase in polarization resistance centered around f = 120 Hz has been identified by Barfod, et nl as particular to cathode reaction processes. specifically the dissociatile adsorption of oxygen and transfer across the triple-phase boundary [9], indicating that the presence of the chromium-bearing interconnect has an effect on the electrochemical processes occurring within the cathode.

The cell with Advances in Solid Oxide Fuel Cells II . 43 Influence of Anode Thickness on Electrochemical Performance 21 pm thick anode had the lowest OCV, which could be explained by the fact that there were some cracks between the current collector and the anode material. These cracks uere due to the fabrication process of the anode and were only obsened for this electrode thickness. It is possible that the gas can reach directly the electrolyte/anode interface. locally increasing the oxygen partial pressure and consequently lowring the OCV.

200 300 .. , 3' 400 Current Density ImAlcm'l Figure 6 Voltage-current characteristic of the same cell as in Figure 4 at a flow of 500 mllmin to the anode. Advances in Solid Oxide Fuel Cells II 41 Influence of Anode Thickness on Electrochemical Performance 0 300 200 100 400 Current Densky W c m j Figure 7 Voltage-currenl characteristic of the same cell as in Figure 4 at a flow of 250 ml/min to the anode. __------ I 0 10 20 30 40 50 , , :I1 60 c u m n t o e n s w irn/vcm5 Figure 8 Voltage-current characteristic of the same cell as in Figure 4 at a flow of 70 mumin to the anode.

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