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Diffusion and Protecting Barrier Layers in a Substrate Supported SOFC Concept

Franco, Thomas and Ruckdäschel, Robert and Lang, Michael and Schiller, Günter and Szabo, Patric (2006) Diffusion and Protecting Barrier Layers in a Substrate Supported SOFC Concept. In: Proceedings 7th International Fuel Solid Oxide Cell Forum 2006. Lucerne Fuel Cell Forum 2006, 3-7 July 2006, Luzern, Schweiz.

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Abstract

High temperature fuel cells of SOFC type as direct converter of chemical into electrical en-ergy show a high potential for reducing considerably the specific energy consumption in different application fields. Of particular interest are advanced light-weight planar cells for electricity supply systems in cars and other mobile systems. Such cells, in one current de-sign, consist mainly of metallic parts, e.g. of ferrite steels. These cells shall operate in the temperature range of 700 to 800°C where oxidation and diffusion processes can be of det-rimental effect on cell performance for long-term operation. Problems arise in particular by diffusion of volatile Cr-species from interconnects into the triple phase boundary (TPB) on the cathode side forming electrochemical reaction inhibiting phases. Furthermore, on the anode side a mutual diffusion of ferritic substrate and anode material, e.g. iron and chro-mium from the ferrite into the anode and nickel from the anode into the ferrite can occur resulting in undesirable phase and structure transformations. Both cases of degradation mechanisms significantly reduce performance and system lifetime. A possible solution of these problems is seen in protecting intermediate layers, which can reduce such effects considerably if they are dense, stable and of high electronic conductivity. Perovskite-type layers (e.g. doped LaCrO3) applied with high-velocity Direct Current-Vacuum Plasma Spraying (DC-VPS) promise to solve reliably such problems.

Item URL in elib:https://elib.dlr.de/46236/
Document Type:Conference or Workshop Item (Paper, Poster)
Title:Diffusion and Protecting Barrier Layers in a Substrate Supported SOFC Concept
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Franco, ThomasUNSPECIFIEDUNSPECIFIED
Ruckdäschel, RobertUNSPECIFIEDUNSPECIFIED
Lang, MichaelUNSPECIFIEDUNSPECIFIED
Schiller, GünterUNSPECIFIEDUNSPECIFIED
Szabo, PatricUNSPECIFIEDUNSPECIFIED
Date:July 2006
Journal or Publication Title:Proceedings 7th International Fuel Solid Oxide Cell Forum 2006
Open Access:Yes
Gold Open Access:No
In SCOPUS:No
In ISI Web of Science:No
Editors:
EditorsEmail
Bossel, UlfUNSPECIFIED
Status:Published
Keywords:Diffusion barrier layers, protecting layers, SOFC, Plasma Spray Process
Event Title:Lucerne Fuel Cell Forum 2006
Event Location:Luzern, Schweiz
Event Type:international Conference
Event Dates:3-7 July 2006
Organizer:European Fuel Cell Forum, Ulf Bossel
HGF - Research field:Energy
HGF - Program:Efficient Energy Conversion (old)
HGF - Program Themes:E BZ - Fuel cells (old)
DLR - Research area:Energy
DLR - Program:E BZ - Fuel cells
DLR - Research theme (Project):E - Hochtemperatur-Brennstoffzellen (old)
Location: Stuttgart
Institutes and Institutions:Institute of Engineering Thermodynamics > Electrochemical Energy Technology
Deposited By: Franco, Thomas
Deposited On:23 Jan 2007
Last Modified:31 Jul 2019 19:18

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