CA2378384A1 - Electrical bonding protected against oxidation on the gas combustion side of a high temperature fuel cell - Google Patents
Electrical bonding protected against oxidation on the gas combustion side of a high temperature fuel cell Download PDFInfo
- Publication number
- CA2378384A1 CA2378384A1 CA002378384A CA2378384A CA2378384A1 CA 2378384 A1 CA2378384 A1 CA 2378384A1 CA 002378384 A CA002378384 A CA 002378384A CA 2378384 A CA2378384 A CA 2378384A CA 2378384 A1 CA2378384 A1 CA 2378384A1
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- Prior art keywords
- fuel cell
- lattice
- lattices
- protective layer
- protected against
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/023—Porous and characterised by the material
- H01M8/0236—Glass; Ceramics; Cermets
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/0258—Collectors; Separators, e.g. bipolar separators; Interconnectors characterised by the configuration of channels, e.g. by the flow field of the reactant or coolant
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/023—Porous and characterised by the material
- H01M8/0232—Metals or alloys
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0202—Collectors; Separators, e.g. bipolar separators; Interconnectors
- H01M8/023—Porous and characterised by the material
- H01M8/0241—Composites
- H01M8/0245—Composites in the form of layered or coated products
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/02—Details
- H01M8/0297—Arrangements for joining electrodes, reservoir layers, heat exchange units or bipolar separators to each other
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/10—Fuel cells with solid electrolytes
- H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
- H01M2008/1293—Fuel cells with solid oxide electrolytes
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Ceramic Engineering (AREA)
- Composite Materials (AREA)
- Fuel Cell (AREA)
Abstract
The invention concerns a fuel cell (1) or a stack of fuel cells comprising cathodes (2), electrolytes (3), anodes (4) and interconnection plates (5, 5' ) arranged in parallel layers, and at least a metal lattice (6, 6') inserted between the anode (4) and the interconnection plate (5) for a flexible bonding. The inventive fuel cell is characterised in that the metal lattice (6, 6') is protected against oxidation.
Description
Electrical Bonding Protected Against Oxidation on the Gas Combustion Side of a High Temperature Fuel Cell The present invention relates to a fuel cell or a stack of fuel cells with the additional features set out in the preamble to Patent Claiml.
It is known that the series connection of a plurality of fuel cells results in a fuel cell stack (referred to as such in the professional literature), which is made up of a series comprising an interconnection plate, a protective layer, a contact layer, a cathode, an electrolyte, and anode, an additional contact layer, and well as an additional interconnection plate. The interconnection plate with its protective and contact layers that are each sprayed onto it form one unit. Cathode, electrolyte, and anode form the electrolyte-electrodes unit. The corresponding units are positioned on each other by layers, so as to be parallel, and repeat in the same series.
Cathode, electrolyte, and anode form the electrolyte-electrodes unit. In each instance, an electrolyte-electrodes unit that is positioned between adjacent interconnection plates forms a high temperature fuel cell with the contact and protective layers that are directly adj acent to the electrolyte-electrodes unit; the sides of each of the two interconnection plates that are positioned against the electrolyte-electrodes unit are also a part of this. The interconnection plates usually consist of CrFeS with 1% Y-oxide, a so-called CDS alloy.
The interconnection plate incorporates gas channels through which, on the one hand, the fuel gas, e.g., hydrogen or methane (natural gas) and, on the other, oxygen or air, are passed. The hydrogen is routed to the anode side, the oxygen or air is routed to the cathode side. These gases are moved at a relatively low pressure of less than 1 bar.
The planar concept of the high temperature fuel cell requires bonding of the electrodes in the two gas chambers over the whole surface, to the greatest extent that this is possible. On the cathode side, the bonding of the electrodes is assured through a contact layer of La-perovskite, e.g., LagSrOo,2Mn03. This perovskite is stable in air. In contrast to this, bonding the electrodes , i.e., the anodes, is more difficult on the fuel gas side. Total bonding of the anodes is needed, however, because of the low transverse conductance of the anode. The anode is produced by silk screening and for this reason is not flat across its total surface, so that flexible bonding that is highly conductive and can be guaranteed to last for an operating life of 40,000 hours is required.
The prior art provides for the use of a nickel lattices as flexible bonding.
As an example, fine-mesh and coarse mesh nickel lattices are positioned one above the other and spot welded so that a flexible intermediate layer with good bonding is created.
One disadvantage found in the prior art is such that when soldering the fuel cell stack and when the fuel cell or the fuel cell stack are operated, an oxide layer builds up in the area of direct contact between the nickel lattice and the CrFes which, in contact when not incorporated into material, consists of Cr203 (CrXOy) and when incorporated into the material probably consists of a CrNi spinel. To a considerable extent, these oxide layers are responsible for the excessively high series resistance of the high temperature fuel cells. This has a pronounced, negative effect on the electrical power output.
In addition, when the fuel cell stack is soldered with a glass solder in air, the surface of the wires oxidizes several ,um into the interior of the wire. Because of the formation of nickel-II-oxide (Ni0), which has a volume that is 16% greater than that of nickel, the thickness of the total packet increases by approximately 10 - 40 ~,m (depending on the soldering conditions). In the oxidized area of the wire this increase in thickness amounts to more than 16%
because the resulting Ni0 is porous. During oxidation, the nickel lattices and their wires are sintered to each other. The original thickness of the lattice packet is reestablished, or under certain circumstances even reduced, during subsequent reduction of the nickel lattice.
During this reduction, the nickel wires are sintered to each other so that reduction of the desired flexibility and a reduction of thickness take place; this is not desirable.
The reduction of thickness can also result in contact breaks, and this can cause component damage.
It is the objective of the present invention to so develop a fuel cell or a fuel cell stack with the features set out in the preamble to Patent Claim 1, that reduction of the thickness and flexibility of the nickel lattice or lattices is avoided, so that total bonding of the anodes and the interconnection plate is ensured to the greatest extent possible.
It is known that the series connection of a plurality of fuel cells results in a fuel cell stack (referred to as such in the professional literature), which is made up of a series comprising an interconnection plate, a protective layer, a contact layer, a cathode, an electrolyte, and anode, an additional contact layer, and well as an additional interconnection plate. The interconnection plate with its protective and contact layers that are each sprayed onto it form one unit. Cathode, electrolyte, and anode form the electrolyte-electrodes unit. The corresponding units are positioned on each other by layers, so as to be parallel, and repeat in the same series.
Cathode, electrolyte, and anode form the electrolyte-electrodes unit. In each instance, an electrolyte-electrodes unit that is positioned between adjacent interconnection plates forms a high temperature fuel cell with the contact and protective layers that are directly adj acent to the electrolyte-electrodes unit; the sides of each of the two interconnection plates that are positioned against the electrolyte-electrodes unit are also a part of this. The interconnection plates usually consist of CrFeS with 1% Y-oxide, a so-called CDS alloy.
The interconnection plate incorporates gas channels through which, on the one hand, the fuel gas, e.g., hydrogen or methane (natural gas) and, on the other, oxygen or air, are passed. The hydrogen is routed to the anode side, the oxygen or air is routed to the cathode side. These gases are moved at a relatively low pressure of less than 1 bar.
The planar concept of the high temperature fuel cell requires bonding of the electrodes in the two gas chambers over the whole surface, to the greatest extent that this is possible. On the cathode side, the bonding of the electrodes is assured through a contact layer of La-perovskite, e.g., LagSrOo,2Mn03. This perovskite is stable in air. In contrast to this, bonding the electrodes , i.e., the anodes, is more difficult on the fuel gas side. Total bonding of the anodes is needed, however, because of the low transverse conductance of the anode. The anode is produced by silk screening and for this reason is not flat across its total surface, so that flexible bonding that is highly conductive and can be guaranteed to last for an operating life of 40,000 hours is required.
The prior art provides for the use of a nickel lattices as flexible bonding.
As an example, fine-mesh and coarse mesh nickel lattices are positioned one above the other and spot welded so that a flexible intermediate layer with good bonding is created.
One disadvantage found in the prior art is such that when soldering the fuel cell stack and when the fuel cell or the fuel cell stack are operated, an oxide layer builds up in the area of direct contact between the nickel lattice and the CrFes which, in contact when not incorporated into material, consists of Cr203 (CrXOy) and when incorporated into the material probably consists of a CrNi spinel. To a considerable extent, these oxide layers are responsible for the excessively high series resistance of the high temperature fuel cells. This has a pronounced, negative effect on the electrical power output.
In addition, when the fuel cell stack is soldered with a glass solder in air, the surface of the wires oxidizes several ,um into the interior of the wire. Because of the formation of nickel-II-oxide (Ni0), which has a volume that is 16% greater than that of nickel, the thickness of the total packet increases by approximately 10 - 40 ~,m (depending on the soldering conditions). In the oxidized area of the wire this increase in thickness amounts to more than 16%
because the resulting Ni0 is porous. During oxidation, the nickel lattices and their wires are sintered to each other. The original thickness of the lattice packet is reestablished, or under certain circumstances even reduced, during subsequent reduction of the nickel lattice.
During this reduction, the nickel wires are sintered to each other so that reduction of the desired flexibility and a reduction of thickness take place; this is not desirable.
The reduction of thickness can also result in contact breaks, and this can cause component damage.
It is the objective of the present invention to so develop a fuel cell or a fuel cell stack with the features set out in the preamble to Patent Claim 1, that reduction of the thickness and flexibility of the nickel lattice or lattices is avoided, so that total bonding of the anodes and the interconnection plate is ensured to the greatest extent possible.
This objective has been achieved with the characteristic features set out in Patent Claim 1.
Advantageous developments of the fuel cell are described in the Secondary Claims 2 to 8.
The incorporation of at least one metal lattice, which is protected against oxidation, between the anode and the interconnection plate so as to provide flexible bonding is regarded as the crux of the present invention.
When used as a contact layer, such lattices entail the advantage that they can no longer oxidize, so that no increase in thickness occurs. Since no oxidation has taken place, no reduction process is needed for the metal lattices, and the associated disadvantages, such a contact breaks when the thickness is reduced or losses of flexibility, are not encountered.. Because the alternating processes of oxidation and reduction have not taken place, the original thickness and flexibility of the lattice, which is protected against oxidation, are preserved, so that a contact layer that provides good bonding is created between the anode and the interconnection layer. In addition, any reduction in the thickness of the metal lattices, which takes place with continuing operation, is prevented.
More expediently, the metal lattices are coated with a oxidation-resistant protective layer. In this way, the metal lattices, e.g., nickel lattices, are unaffected with respect to their composition and with respect to their mechanical and electrical properties, i.e., amongst other things, they remain flexible, their thickness does not change, and essentially they retain all their advantageous characteristics. In this regard, it is advantageous that prior to being installed as a flexible contact layer, the metal lattices undergo the coating process. Assembly with the other components, as well as the soldering, is subsequently carried out in the usual manner.
Coated, nickel lattices can be provided as metal lattices. The nickel lattices satisfy the requirements with respect to flexibility and electrical conductivity.
Coated, stainless steel lattices can also be provided as metal lattices; these possess the property that they oxidize only to a depth of some 5 pm beneath their surface. These stainless steel lattices are similarly coated with an oxidation-resistant protective layer.
One additional advantage of the stainless steel lattices is that their coefficient of thermal expansion is well matched to the thermal behaviour of the components of the fuel cell stack.
This characteristic constitutes a considerable advantage when the fuel cell is operated at high temperatures.
It is expedient that the protective layer contain chromium and is thus matched to the chemical composition of the interconnection plate.
It is advantageous that the protective layer be of chromium carbide, which is electrically conductive to a very high degree and adheres very well to the metal lattice.
In addition, a chromium carbide layer is also very resistant to corrosion with respect to the corresponding oxygen partial pressures on the combustion-gas side. In addition, these layers are stable when methane or gases derived from carbon, which are future operating media on the fuel gas side of the high temperature fuel cells, are used.
Another advantage of coating with chromium carbide is that when gases derived from carbon are used and routed through the gas channels of the anode side of the interconnection plates, components lost from the protective layers are made up again by the gases derived from carbon.
For this reason, the chromium carbide layer is particularly favourable from the thermodynamic standpoint.
The following can be used as chromium carbide: C3C2, CrC, Cr7C3, or Crz3C6. It is also possible for the protective layer of the metal lattices to be of chromium nitride.
Most expediently, the protective layer is of a thickness d, from 0.1 to 10~,m so that, on the one hand, there is a sufficiently thick oxidation protection and, on the other hand, the flexibility of the metal lattices is scarcely restricted.
The present invention will be described in greater detail below on the basis of the drawings appended hereto. These drawing show the following:
Figure 1: A diagrammatic cross section through the layers of a fuel cell;
Figure 2: An enlarged, diagrammatic cross section through a coated nickel lattice.
As shown in the diagrammatic representation at Figure 1, the fuel cell stack of fuel cell 1 comprises an interconnection plate 5', a protective layer 8, a contact layer 9, a cathode 2, an electrolyte 3, an anode 4, two nickel lattices 6, 6' that are positioned one on top of the other, and an interconnection plate 5, these components being arranged by layers, one on top of the other, so as to be parallel to each other. The nickel lattice 6 is thinner than the nickel lattice 6'.
The nickel lattices 6, 6' are protected against oxidation so as to prevent the oxidation of these lattices that usually takes place when the complete fuel cell stack is soldered. Oxidation of the nickel lattices is linked to an increase in thickness, the original thickness of the lattice packet being reestablished during a subsequent reduction process. This can lead to contact breaks, and these, in their turn, can result in damage to certain components. In addition, the nickel wires sinter to each other after reduction, so that the desired flexibility is reduced. The lattices, which are protected against oxidation, thus avoid the oxidation/reduction process for the lattice packet and the associated disadvantages. The original flexibility and the thickness of the lattices can be retained, so that bonding of the anode 4 and the contact layer of the nickel lattices 6, 6' and of the interconnection plate 5 is ensured across the whole surface. In addition, reduction of the thickness of the nickel lattices 6, 6' during operation of the fuel cell is prevented.
As is made clear in Figure 1 and Figure 2, the nickel lattices 6, 6' are coated with an oxidation resistant protective layer 7. This coating can be done before the assembly of the individual components. The nickel lattices 6, 6' are not changed by an oxidation process and a subsequent reduction process with respect to their original, advantageous properties.
Figure 2 shows an enlarged section of the coating of a nickel lattice 6 or 6'.
Stainless steel lattices can be provided in place of the nickel lattices 6, 6'. These entail the advantage that their coefficient of longitudinal thermal expansion is matched to the components of the high temperature fuel cell.
The protective layer 7 consists of chromium carbide, the advantage of which is that when gases derived from carbon are used and routed through the gas channels of the anode side of the inter-connection plates 5, 5', components lost from the protective layers are again made good.
The following can be used as chromium carbide: C3C2, CrC, Cr~C3, or Cr23C6, or similar chromium carbides with different valencies.
The protective layer 7 is of a thickness d of 0.1 to 10 ~,m, in order that it can provide reliable protection against oxidation and, at the same time, scarcely affect the flexibility of the nickel lattices 6, 6'.
Advantageous developments of the fuel cell are described in the Secondary Claims 2 to 8.
The incorporation of at least one metal lattice, which is protected against oxidation, between the anode and the interconnection plate so as to provide flexible bonding is regarded as the crux of the present invention.
When used as a contact layer, such lattices entail the advantage that they can no longer oxidize, so that no increase in thickness occurs. Since no oxidation has taken place, no reduction process is needed for the metal lattices, and the associated disadvantages, such a contact breaks when the thickness is reduced or losses of flexibility, are not encountered.. Because the alternating processes of oxidation and reduction have not taken place, the original thickness and flexibility of the lattice, which is protected against oxidation, are preserved, so that a contact layer that provides good bonding is created between the anode and the interconnection layer. In addition, any reduction in the thickness of the metal lattices, which takes place with continuing operation, is prevented.
More expediently, the metal lattices are coated with a oxidation-resistant protective layer. In this way, the metal lattices, e.g., nickel lattices, are unaffected with respect to their composition and with respect to their mechanical and electrical properties, i.e., amongst other things, they remain flexible, their thickness does not change, and essentially they retain all their advantageous characteristics. In this regard, it is advantageous that prior to being installed as a flexible contact layer, the metal lattices undergo the coating process. Assembly with the other components, as well as the soldering, is subsequently carried out in the usual manner.
Coated, nickel lattices can be provided as metal lattices. The nickel lattices satisfy the requirements with respect to flexibility and electrical conductivity.
Coated, stainless steel lattices can also be provided as metal lattices; these possess the property that they oxidize only to a depth of some 5 pm beneath their surface. These stainless steel lattices are similarly coated with an oxidation-resistant protective layer.
One additional advantage of the stainless steel lattices is that their coefficient of thermal expansion is well matched to the thermal behaviour of the components of the fuel cell stack.
This characteristic constitutes a considerable advantage when the fuel cell is operated at high temperatures.
It is expedient that the protective layer contain chromium and is thus matched to the chemical composition of the interconnection plate.
It is advantageous that the protective layer be of chromium carbide, which is electrically conductive to a very high degree and adheres very well to the metal lattice.
In addition, a chromium carbide layer is also very resistant to corrosion with respect to the corresponding oxygen partial pressures on the combustion-gas side. In addition, these layers are stable when methane or gases derived from carbon, which are future operating media on the fuel gas side of the high temperature fuel cells, are used.
Another advantage of coating with chromium carbide is that when gases derived from carbon are used and routed through the gas channels of the anode side of the interconnection plates, components lost from the protective layers are made up again by the gases derived from carbon.
For this reason, the chromium carbide layer is particularly favourable from the thermodynamic standpoint.
The following can be used as chromium carbide: C3C2, CrC, Cr7C3, or Crz3C6. It is also possible for the protective layer of the metal lattices to be of chromium nitride.
Most expediently, the protective layer is of a thickness d, from 0.1 to 10~,m so that, on the one hand, there is a sufficiently thick oxidation protection and, on the other hand, the flexibility of the metal lattices is scarcely restricted.
The present invention will be described in greater detail below on the basis of the drawings appended hereto. These drawing show the following:
Figure 1: A diagrammatic cross section through the layers of a fuel cell;
Figure 2: An enlarged, diagrammatic cross section through a coated nickel lattice.
As shown in the diagrammatic representation at Figure 1, the fuel cell stack of fuel cell 1 comprises an interconnection plate 5', a protective layer 8, a contact layer 9, a cathode 2, an electrolyte 3, an anode 4, two nickel lattices 6, 6' that are positioned one on top of the other, and an interconnection plate 5, these components being arranged by layers, one on top of the other, so as to be parallel to each other. The nickel lattice 6 is thinner than the nickel lattice 6'.
The nickel lattices 6, 6' are protected against oxidation so as to prevent the oxidation of these lattices that usually takes place when the complete fuel cell stack is soldered. Oxidation of the nickel lattices is linked to an increase in thickness, the original thickness of the lattice packet being reestablished during a subsequent reduction process. This can lead to contact breaks, and these, in their turn, can result in damage to certain components. In addition, the nickel wires sinter to each other after reduction, so that the desired flexibility is reduced. The lattices, which are protected against oxidation, thus avoid the oxidation/reduction process for the lattice packet and the associated disadvantages. The original flexibility and the thickness of the lattices can be retained, so that bonding of the anode 4 and the contact layer of the nickel lattices 6, 6' and of the interconnection plate 5 is ensured across the whole surface. In addition, reduction of the thickness of the nickel lattices 6, 6' during operation of the fuel cell is prevented.
As is made clear in Figure 1 and Figure 2, the nickel lattices 6, 6' are coated with an oxidation resistant protective layer 7. This coating can be done before the assembly of the individual components. The nickel lattices 6, 6' are not changed by an oxidation process and a subsequent reduction process with respect to their original, advantageous properties.
Figure 2 shows an enlarged section of the coating of a nickel lattice 6 or 6'.
Stainless steel lattices can be provided in place of the nickel lattices 6, 6'. These entail the advantage that their coefficient of longitudinal thermal expansion is matched to the components of the high temperature fuel cell.
The protective layer 7 consists of chromium carbide, the advantage of which is that when gases derived from carbon are used and routed through the gas channels of the anode side of the inter-connection plates 5, 5', components lost from the protective layers are again made good.
The following can be used as chromium carbide: C3C2, CrC, Cr~C3, or Cr23C6, or similar chromium carbides with different valencies.
The protective layer 7 is of a thickness d of 0.1 to 10 ~,m, in order that it can provide reliable protection against oxidation and, at the same time, scarcely affect the flexibility of the nickel lattices 6, 6'.
Claims (7)
1. Fuel cell (1) or fuel cell stack with cathodes (2), electrolyte (3), anodes (4) and interconnection plates (5, 5') that are arranged in layers so as to be parallel to each other, as well as at least one metal lattice (6, 6') that is incorporated between the anode (4) and the interconnection plate (5) to provide for flexible bonding, characterized in that at least one metal lattice (6, 6') is protected against oxidation, characterized in that at least one metal lattice (6, 6') is coated with an oxidation resistant protective layer (7) and thus protected against oxidation, the protective layer (7) providing good electrical bonding between the anode (4) and the interconnection plate (5).
2. Fuel cell as defined in Claim 1, characterized in that the lattice (6, 6') is a coated nickel lattice.
3. Fuel cell as defined in Claim 1 or Claim 2, characterized in that the lattice (6, 6') is a coated stainless steel lattice.
4. Fuel cell as defined in Claim 2 or Claim 3, characterized in that the protective layer (7) contains chromium.
5. Fuel cell as defined in one of the preceding Claims 2 to 4, characterized in that the protective layer (7) is of chromium carbide.
6. Fuel cell as defined in Claim 5, characterized in that C3C2, CrC, Cr7C3 or Cr23C6 is used as chromium carbide.
7. Fuel cell as defined in one of the preceding Claims, characterized in that the protective layer (7) is approximately 0.1 - 10 µm thick
Applications Claiming Priority (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE19932192 | 1999-07-09 | ||
| DE19932192.2 | 1999-07-09 | ||
| PCT/DE2000/002071 WO2001004981A1 (en) | 1999-07-09 | 2000-06-26 | Electrical bonding protected against oxidation on the gas combustion side of a high temperature fuel cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2378384A1 true CA2378384A1 (en) | 2001-01-18 |
Family
ID=7914289
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002378384A Abandoned CA2378384A1 (en) | 1999-07-09 | 2000-06-26 | Electrical bonding protected against oxidation on the gas combustion side of a high temperature fuel cell |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP1206807A1 (en) |
| AU (1) | AU6260600A (en) |
| CA (1) | CA2378384A1 (en) |
| WO (1) | WO2001004981A1 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006053422A1 (en) * | 2004-11-16 | 2006-05-26 | Versa Power Systems, Ltd. | Electrically conductive fuel cell contact materials |
Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE10033898B4 (en) * | 2000-07-12 | 2009-06-18 | Forschungszentrum Jülich GmbH | High temperature fuel cell and fuel cell stack |
| EP1647068B1 (en) * | 2003-07-18 | 2013-12-25 | Versa Power Systems, Ltd. | Electrically conductive fuel cell contact material |
| DE102005014077B4 (en) * | 2005-03-23 | 2012-05-24 | Forschungszentrum Jülich GmbH | Interconnector for high-temperature fuel cells and method for its production and method for operating a fuel cell |
| DE102008036847A1 (en) * | 2008-08-07 | 2010-02-11 | Elringklinger Ag | Fuel cell unit and method for making an electrically conductive connection between an electrode and a bipolar plate |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4950562A (en) * | 1988-04-21 | 1990-08-21 | Toa Nenryo Kogyo Kabushiki Kaisha | Solid electrolyte type fuel cells |
| DE4016157A1 (en) * | 1989-06-08 | 1990-12-13 | Asea Brown Boveri | High temp. fuel cell stack - with cells series-connected by separator plates and elastic current collectors |
| EP0424732A1 (en) * | 1989-10-27 | 1991-05-02 | Asea Brown Boveri Ag | Current conduction element for stacked hightemperature fuel cells and method of manufacture |
| DE4237602A1 (en) * | 1992-11-06 | 1994-05-11 | Siemens Ag | High temperature fuel cell stack and process for its manufacture |
| DE19517443C2 (en) * | 1995-05-12 | 1997-07-10 | Mtu Friedrichshafen Gmbh | Corrosion-resistant current collector |
| AUPO897897A0 (en) * | 1997-09-05 | 1997-09-25 | Ceramic Fuel Cells Limited | An interconnect device for a fuel cell assembly |
| DE29802444U1 (en) * | 1998-02-12 | 1999-04-01 | Siemens AG, 80333 München | High temperature fuel cell and high temperature fuel cell stack |
| DE19836352A1 (en) * | 1998-08-11 | 2000-02-17 | Siemens Ag | High temperature fuel cell has a nickel net fixed in electrically conductive contact with a nickel layer on the fuel gas side of a bipolar plate to reduce chromium oxide layer formation |
-
2000
- 2000-06-26 CA CA002378384A patent/CA2378384A1/en not_active Abandoned
- 2000-06-26 EP EP00949131A patent/EP1206807A1/en not_active Withdrawn
- 2000-06-26 WO PCT/DE2000/002071 patent/WO2001004981A1/en not_active Application Discontinuation
- 2000-06-26 AU AU62606/00A patent/AU6260600A/en not_active Abandoned
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2006053422A1 (en) * | 2004-11-16 | 2006-05-26 | Versa Power Systems, Ltd. | Electrically conductive fuel cell contact materials |
Also Published As
| Publication number | Publication date |
|---|---|
| EP1206807A1 (en) | 2002-05-22 |
| AU6260600A (en) | 2001-01-30 |
| WO2001004981A1 (en) | 2001-01-18 |
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