JP2021190208A - Thread for current collector, current collector consisting of thread for current collector, and fuel cell system using current collector - Google Patents

Abstract

To provide a thread for a current collector with an internal modification function in addition to a current collector function, a current collector that can omit a fuel gas reformer without impairing the conductivity of the thread for the current collector, and a fuel cell system configured by using the current collector.SOLUTION: There are provided a thread 1 for a current collector which is located between an interconnector and a cell inside a stack of a solid oxide fuel cell, and has both performances of a conductive yarn 2 having the current collecting characteristic and a reforming catalyst yarn 3 having an internal reforming function by the conductive yarn and the catalyst yarn being twisted to each other, a current collector 10 consisting of the thread 1 for the current collector, and a fuel cell system using the current collector 10.SELECTED DRAWING: Figure 1

Description

The present invention relates to a current collector thread, a current collector composed of a current collector thread, and a fuel cell system using the current collector, and in particular, a modification for modifying a highly conductive conductive thread and a fuel gas. The present invention relates to a current collecting material yarn combined with a catalyst yarn, a current collecting material obtained by knitting the current collecting material yarn, and a fuel cell system using the current collecting material. In this specification, the fuel cell system to which these current collectors and the like are applied will be described in the case of a fuel cell system using a solid oxide fuel cell (SOFC), but the fuel cell system is not limited to the solid oxide fuel cell. It also applies to other fuel cell systems.

(Current collector)
FIG. 9 shows a single cell 102 which is a basic unit of a fuel cell system 100 of a solid oxide fuel cell (SOFC). FIG. 9A is a perspective view showing the entire general single cell 102. FIG. 9B shows a cross-sectional view of the current collector 10 installed in the single cell 102. In the single cell 102, the air electrode 103 which is a cathode, the fuel electrode 104 which is an anode, and the electrolyte 105 which conducts only ions constitute a power generation cell 107. The single cells 102 are stacked in series to form a stack 110 to generate a required electromotive force. On both outer sides of the power generation cell 107, an air electrode side interconnector 106a and a fuel electrode side interconnector 106b that separate the fuel gas and the oxidation gas and electrically connect the single cell 102 are provided. Further, the interconnectors 106a and 106b also have a role of collecting electricity generated in the power generation cell 107 and a role of supplying and discharging fuel gas and oxidation gas. Therefore, a fuel gas flow path 108 and an oxidation gas flow path 109 are provided on the surface thereof by groove processing. The air electrode side current collector 10a is located between the air electrode side interconnector 106a and the power generation cell 107 to improve power generation efficiency, and the fuel electrode side collector is located between the fuel electrode side interconnector 106b and the power generation cell 107. Generally, the electric material 10b is provided. The interconnectors 106a and 106b are also referred to as "separators".

FIG. 10 shows the power generation principle of a solid oxide fuel cell (SOFC). FIG. 10A shows the power generation principle when carbon monoxide is used as the fuel, and FIG. 10B shows the power generation principle when hydrogen is used as the fuel. The solid oxide fuel cell uses hydrogen, carbon monoxide, or the like as fuel, and the electrode reaction shown below proceeds at the air electrode (cathode) 103 and the fuel electrode (anode) 104.
Fuel pole 104: (in the case of hydrogen fuel) H ₂ + O ^2- → H ₂ O + 2e ⁻
For the fuel electrode 104 :( carbon monoxide _{^{fuel) CO + O 2- → CO 2}} + 2e -
The air electrode _{103: 1 / 2O 2 + 2e} - → O 2-

As shown in the reaction equation described above, oxygen ions ( ^O2- ) generated in the air electrode 103 pass through the electrolyte 105 and move to the fuel electrode 104. On the other hand, in the fuel electrode 104, hydrogen or carbon monoxide, which is a fuel, ^{reacts with oxygen ions (O 2-} ) to emit electrons (2e ⁻ ), and the electrons (2e ⁻ ) pass through an external circuit to air. Move to pole 103.

As described above, in the solid oxide fuel cell (SOFC), hydrogen or carbon monoxide is used as the fuel. Carbon monoxide is generated when a carbon compound burns in an incomplete combustion state. It is colorless and odorless, its presence is difficult to detect, and it is highly toxic and may cause carbon monoxide poisoning. On the other hand, hydrogen fuel is difficult to obtain and has problems in transportation and storage methods. Therefore, hydrogen is produced from a gaseous fuel such as methane and propane containing hydrogen in the molecule and a liquid fuel such as methanol and supplied to the fuel cell system 100. Extracting hydrogen fuel from various fuels in this way is called "reforming". As a general reforming method for fuel gas, there is a steam reforming method in which water is added to decompose the fuel gas.
CH ₄ + H ₂ O → 3H ₂ + CO
CO + H ₂ O → H ₂ + CO ₂
CH ₄ + 2H ₂ O → 4H ₂ + CO ₂ −Q (endothermic)

(Reform of fuel gas)
FIG. 11 shows the configuration of a conventional fuel cell system provided with a reformer. The fuel cell system 100 includes a fuel cell power generation unit 100a and a hot water supply unit 100b. For fuel gas such as city gas supplied to the fuel cell power generation unit 100a, the sulfur component mixed in the fuel gas is removed by the fuel gas desulfurizer 111, and the fuel gas reformer 112 and the fuel cell power generation unit 100a are removed. Performance degradation is prevented. Then, the fuel gas reformer 112 converts methane, which is a fuel gas, into hydrogen by the above-mentioned steam reforming reaction. The reformed fuel gas is supplied to the cell stack 110 to generate electricity, and the generated DC power is converted into AC power by an inverter. The heat generated by the power generation is recovered by the exhaust gas heat exchanger 113, and the cold water supplied from the hot water storage tank is converted into hot water and returned to the hot water storage tank 115. Then, it is supplied to the outside of the fuel cell power generation unit 100a via the boiler. The condensed water generated in the exhaust gas heat exchanger 113 passes through the ion exchange resin 114 to become pure water, is returned to the fuel gas reformer 112, and is used for the steam reforming reaction.

Patent Document 1 discloses a current collector for a fuel cell that improves the electrical connection between the power generation cell and the separator and improves the power generation efficiency and cycle characteristics of the fuel cell. Here, in the current collector for a flat plate fuel cell, metal fibers are woven on the surfaces where the air electrode (cathode) and the fuel electrode (anode) of the flat plate fuel cell face the cathode side separator and the anode side separator, respectively. It is described that the metal fiber knit formed in 1 is arranged as a current collector and is sandwiched between the electrode and the separator to pressurize.

Patent Document 2 discloses an internally reformed solid oxide fuel cell or the like that suppresses the use of a reforming catalyst and an electronically conductive substance. Here, the internally reformed solid oxide fuel cell is provided with a cathode, an anode, an electrolyte sandwiched between the cathode and the anode, and a current collector provided in contact with the anode, and the current collector is provided. It is described that a film containing a reforming catalyst for a reaction that produces hydrogen from a hydrocarbon and an electron conductive substance contains a catalytic current collecting element formed on the surface of a substrate.

Patent Document 3 discloses an anode support for a solid oxide fuel cell having a high porosity while maintaining sufficient mechanical strength. Here, it has a paper-like porous support substrate formed by molding ion conductive oxide fibers into a non-woven fabric, and an anode active layer composed of electrode catalyst particles and ion conductive oxide particles, and at least the anode active layer. An anode support for a solid oxide fuel cell, which is partially formed inside a paper-like porous support substrate, is described.

Japanese Unexamined Patent Publication No. 2012-79492 Japanese Unexamined Patent Publication No. 2010-103009 Japanese Unexamined Patent Publication No. 2014-67488

In a conventional fuel cell, a reformer that reforms the fuel gas into a component suitable for power generation must be installed near the cell stack, and in order to improve power generation efficiency, there is a facility space for reforming the fuel gas. There was a problem that it was needed. Further, there is a problem that the fuel gas must be passed through a fuel gas reformer before power generation, and a pipe for supplying gas and a seal for preventing gas leakage are required.

Further, the internal reforming catalyst for reforming the fuel gas generally has a structure in which contact resistance is likely to occur, and there is a problem that the conductivity originally possessed by the current collector is impaired.

The object of the present application is an internal reforming function that solves such a problem, can be easily installed inside an existing fuel cell system, and can omit a fuel gas reformer without impairing the conductivity originally possessed by the current collector. It is an object of the present invention to provide a current collecting material thread, a current collecting material made of a current collecting material thread, and a fuel cell system using the current collecting material.

In order to achieve the above object, the current collecting material yarn according to the present invention is provided between the interconnector and the cell inside the stack of the solid oxide fuel cell, and the conductive yarn having the current collecting characteristics and the fuel gas. It is characterized in that it is twisted with a reforming catalyst yarn having an internal reforming function.

With the above configuration, by providing the current collector thread inside the stack of the fuel cell, it is possible to replace the fuel gas reformer which was indispensable in the prior art by the internal reforming function of the current collector thread. Further, even with an existing fuel cell, a thread for a current collecting material can be easily provided inside the stack.

Further, in order to achieve the above object, the current collector according to the present invention is provided between the interconnector inside the stack of the fuel cell of the solid oxide fuel cell and the cell, and is a conductive yarn having a current collecting characteristic. And the reforming catalyst yarn having an internal reforming function of the fuel gas preferably form a textile.

With the above configuration, by providing a current collector having an internal reforming function in the stack of the fuel cell, it is possible to replace the fuel gas reformer which was indispensable in the prior art by the internal reforming function of the current collector. .. Further, even with an existing fuel cell, a current collector having an internal reforming function can be easily provided inside the stack.

Further, it is preferable that the current collecting material is formed of a woven fabric having a twisted yarn structure in which a reformed catalyst yarn and a conductive yarn are twisted together. As a result, the reformed catalyst thread and the conductive thread can be combined to form a current collecting material.

Further, it is preferable that the reformed catalyst yarn and the conductive yarn form a woven fabric with one of them as a warp and the other as a weft. Thereby, the reformed catalyst thread and the conductive thread can be woven to form a current collecting material.

Further, it is preferable that the reformed catalyst thread is a ceramic fiber and the conductive thread is a metal wire. This makes it possible to form a current collector by weaving a metal wire having a conductive thread and a ceramic fiber having a modifying property.

Further, in the fuel cell system, it is preferable to insert a current collector between the interconnector inside the stack of the fuel cell and the cell to reform the hydrocarbon of the fuel gas supplied to the fuel cell inside the stack.

With the above configuration, the current collector thread, the current collector composed of the current collector thread, and the fuel cell system using the current collector can easily install the current collector inside the existing fuel cell, and the current collector can be used. The fuel gas reformer can be omitted without impairing the conductivity. Further, even in the existing fuel cell system, the current collector can be easily provided inside the stack.

According to a current collector thread having an internal reforming function in addition to the conductivity according to the present invention, a current collector composed of a current collector thread, and a fuel cell system using the current collector, the inside of an existing fuel cell A current collector consisting of a current collector thread and a current collector thread with an internal reforming function that can be easily installed and has an internal reforming function that can omit the fuel gas reformer without impairing the conductivity originally possessed by the current collector. , And a fuel cell system using a current collector can be provided.

It is explanatory drawing which shows the schematic structure of one Embodiment of the current collector thread which consists of the conductive thread and the reformed catalyst thread which concerns on this invention. It is explanatory drawing which shows the schematic structure of the other embodiment of the current collector thread which consists of a conductive thread and a reforming catalyst thread. It is explanatory drawing which shows the schematic structure of the embodiment of one woven fabric which woven the conductive thread which is the thread for a current collector, and the reforming catalyst thread. It is explanatory drawing which shows the Example to the plain weave, the twill weave, and the satin weave which are the three original textures of a woven fabric. It is explanatory drawing which shows the embodiment of the variation of a plain weave. It is explanatory drawing which shows the Example of the horizontal knitting of a knit, and the example of the vertical knitting of a knit. It is a graph which shows the measurement result of the ASR (contact resistance) value of the current collector which concerns on this invention. It is a graph which shows the measurement result of the modification property of the current collector which concerns on this invention. It is a perspective view which shows the structure of a single cell which is a basic unit of a fuel cell system, and is the sectional view which shows the current collector installed in a single cell. It is explanatory drawing which shows the power generation principle of a solid oxide fuel cell when hydrogen and carbon monoxide are used as a fuel. It is explanatory drawing which shows the structure of the conventional fuel cell system provided with a reformer.

(Thread for current collector)
Hereinafter, a schematic configuration of one embodiment of the current collector thread 1 having an internal modification function according to the present invention will be shown with reference to the drawings. FIG. 1A shows a conductive thread 2 and a modified catalyst thread 3 which are the current collecting material threads 1 used for the current collecting material 10, and a metal wire 4 is an example of the material of the conductive thread 2 having a current collecting function. The ceramic fiber 5 is shown as an example of the modified catalyst yarn 3 having a modifying function. FIG. 1B shows a covering twisted yarn 7 in which the conductive yarn 2 and the modified catalyst yarn 3 are twisted together as an example of forming the current collecting material yarn 1 from the conductive yarn 2 and the reformed catalyst yarn 3. Is shown. Here, FIG. 1B shows a case where the conductive yarn 2 is used as the core material 6 and the modified catalyst yarn 3 is used as the covering twisted yarn 7, and FIG. 1C shows the case where the conductive yarn 2 is covered. This is a case where the twisted yarn 7 is used and the modified catalyst yarn 3 is used as the core material 6, and by twisting them together, both of them are included in the current collector yarn 1 according to the present invention.

As shown in FIG. 1 (b), the reformed catalyst yarn 3 is used as a core material 6 having a twisted yarn structure, and the conductive yarn 2 is used as a covering twisted yarn 7 with respect to the core material 6. Further, the conductive yarn 2 and the reforming catalyst yarn 3 form a woven fabric 8 with one of them as a warp and the other as a weft 13. The conductive thread 2 is a cover thread made of a metal wire 4 such as stainless steel or copper-nickel alloy. Further, the reforming catalyst thread 3 includes a ceramic fiber 5 and the like.

FIG. 2 shows a schematic configuration of another embodiment of the current collecting material thread 1 composed of the conductive thread 2 and the reformed catalyst thread 3. There are various types of current collector yarn 1 depending on whether the short fibers are long fibers or how to "twist" them. The current collector yarn 1 includes a “single twist yarn 14” shown in FIG. 2 (a) and a “multi-twist yarn 15” shown in FIG. 2 (b). The single-twisted yarn 14 is a yarn material obtained by inserting a "twist" in either the S direction or the Z direction into a non-twisted yarn. The various twists 15 are yarn materials in which single-twisted yarns 14 are aligned and twisted in the direction opposite to that of the single-twisted yarns 14. Twins with two threads are called "double thread", and twins with three threads are called "triple thread". Is a ₁ is three pieces yarn 14 in FIG. 2 (a), an a ₂ is two pieces yarn 14 in FIG. 2 (a), b ₁ is three various yarns shown in FIG. 2 (b) a 15, _{b 2} shows various yarns 15 of the two in FIG. 2 (b). Here, the twins refer to a yarn material in which a plurality of singles are aligned and "twisted". Since the "twist" of the twins is applied in the opposite direction to the single child, the "twist" is well-balanced, and when used for the woven fabric 8 using the twins, the cloth is less deformed.

Depending on how and what kind of "twist" is applied to the current collector yarn 1, for example, a strong twist yarn, a "moku (杢) yarn" made by twisting different colored single yarns, and a "moku yarn" that is strong against thick yarns. A wall in which untwisted fine yarn is twisted and twisted in the opposite direction to the thick yarn, and the thick yarn is spirally wound around the fine yarn by "twisting back" of the thick yarn. Twisted yarn, lame yarn made by twisting lame (cut foil) with yarn, different color dyed yarn made by twisting yarns with different dyeability, and covering twisted yarn with "entangled yarn" covered single or double around the core yarn 7 (Covered yarn) etc. FIG. 2C shows an example of the single covering twisted yarn 7a, and FIG. 2D shows an example of the double covering twisted yarn 7b. In the double covering twisted yarn 7b, the core yarn is referred to as a lower winding 17, and the entwined yarn is also referred to as an upper winding 16. Further, as design twisted yarns, there are Nep yarn, Mar yarn, Slab yarn, Polar yarn, Ring yarn, Bouclé yarn, Loop yarn, Snail yarn, Karl yarn, Square yarn, Brush yarn, Shaggy yarn, Mole yarn, Chenille yarn and the like. In addition, the threat (nop) system includes a nop yarn, a threat yarn, and a long threat yarn. In this way, the technique of twisting and "twisting" a yarn is applied to various yarns, giving the yarn convergence and roundness, increasing the strength of the yarn, and suppressing the generation of fluff. ing.

(Fiber used for current collector)
FIG. 3 shows a schematic configuration of an embodiment of one woven fabric 8 in which the conductive thread 2 and the reformed catalyst thread 3 which are the current collecting material threads 1 are woven. In the woven fabric 8, the warp thread 12 refers to the thread passing in the horizontal direction of the woven fabric 8, and the weft thread 13 refers to the thread passing through the vertical direction of the woven fabric 8. Is called. FIG. 3A shows a current collector thread 1, and FIG. 3B shows a weft thread 12 as a conductive thread 2 having a current collecting characteristic and a warp thread of a modified catalyst thread 3 having a modifying function. The woven fabric 8 formed as 13 is shown. Alternatively, the woven fabric structure 8 formed by using the conductive yarn 2 as a warp and the reforming catalyst yarn 3 as a weft is shown (not shown). Then, as shown in FIG. 3C, the woven fabric 8 is supported with nickel particles 21 having a particle size of 1 μm or less to add a modifying function. As a result, the modification function by the nickel particles 21 is further added to the modification function of the conductive thread 2 itself having the current collecting characteristic. In FIG. 3C, the nickel particles 21 added to the fabric 8 are represented by black dots for the sake of clarity. The above-mentioned conductive yarn 2 and modified catalyst yarn 3 are woven into a cloth-like woven fabric 8, and the cloth-like woven fabric 8 is used as an interconnector 106 inside a fuel cell system 100 of a solid oxide fuel cell. It is used as a current collector 10 with a reforming function between the power cell 107 and the power generation cell 107.

FIG. 4 shows the structure and cross-sectional view of the basic Mihara structure of the woven fabric 8. 4 (a) is a plain weave 18, FIG. 4 (b) is a double-sided twill weave 19a, FIG. 4 (c) is a single-sided twill weave 19b, and FIG. 4 (d) is a satin weave 20. be. In addition to the Mihara structure, the woven fabric 8 has a deformed structure, a layered structure, and as a special structure, a pile structure, an entangled structure, and a pattern structure that weaves a pattern. Or it is used in combination.

The plain weave 18 shown in FIG. 4A is a structure in which two warp threads 12 and two weft threads circulate, and each thread floats and sinks and intersects with each other, which is the widest structure of the woven fabric 8. This is the structure used. The twill weave 19 shown in FIGS. 4 (b) and 4 (c) is also referred to as "twill weave", and the warp yarn 12 and the weft yarn 13 are each made of three or more in a complete structure. Then, unlike the plain weave 18, the warp threads 12 and the weft threads 13 do not alternately rise and fall, and the “Aya line” appears diagonally at the tissue points where the warp threads 12 and the weft threads 13 continuously rise and fall. The twill weave 19 has a smaller degree of crossing than the plain weave 18, and can increase the density of threads to make the ground thicker. The twill weave 19 is weaker in friction than the plain weave 18, but has a feature that the geology is flexible, wrinkles are less likely to occur, the density of threads can be increased, and the twill weave is rich in luster.

The twill weave 19 includes a double-sided twill weave 19a shown in FIG. 4 (b) and a single-sided twill weave 19 b shown in FIG. 4 (c). The double-sided twill weave 19a is a twill weave 19 in which the appearances of the warp threads 12 and the weft threads 13 on the cloth surface are the same and the appearances of the front and back are the same, but the directions of the twill lines are opposite to each other. The single-sided twill weave 19b is a twill weave 19 in which the appearances of the warp threads 12 and the weft threads 13 on the cloth surface are not the same, and the appearances of the front and back surfaces are different.

The satin weave 20 shown in FIG. 4D is a structure in which the warp threads 12 and the weft threads 13 are made of five or more threads and only one crossing point is arranged at regular intervals, and the warp threads 12 or the weft threads 13 are often floated. It is an organization. Therefore, the ground is thicker than the plain weave 18 and the twill weave 19, but the fabric structure is the most flexible.

When this cloth-like woven fabric 8 is used as a current collector 10 having a reforming function between the interconnector 106 inside the cell stack 110 of the fuel cell of a solid oxide fuel cell and the power generation cell 107, the plain weave 18 and the weave Strength against friction depending on the type of weave represented by weave 19, satin weave 20, double-sided weave or single-sided weave, how the warp threads 12 and weft threads 13 appear, and the number of junctions between the warp threads 12 and the weft threads 13. You can choose the characteristics of the organization, such as flexibility, adhesion to the interconnector 106 and the generator cell 107. Therefore, a structure suitable for the characteristics of the solid oxide fuel cell can be selected.

FIG. 5 shows an example of a variation of the woven fabric 8 used as the current collector 10. FIG. 5A is an example in which a finer weft thread 13 is added to a plain weave 18 composed of a warp thread 12 and a weft thread 13. FIG. 5B is an example of a plain weave 18 in which the thicknesses of the warp threads 12 and the weft threads 13 are significantly different. The variation of these woven fabrics 8 is determined according to the performance that meets the conditions such as flexibility required for the current collector 10. Since the present invention has a mixed weaving structure of a conductive thread 2 such as a metal wire 4 and a modified catalyst 3 such as ceramic, it is inserted between the interconnectors 106a and 106b of the fuel cell system 100 and the cell stack 110. It can be used as a current collector 10 and can be easily installed inside an existing fuel cell. Further, it is not necessary to design the cell structure exclusively for the adoption of the current collector 10. Further, as shown in FIG. 5, the weaving method of the conductive yarn 2 constituting the current collecting material 10 and the reforming catalyst 3 is not limited to the basic Mihara structure of the woven fabric 8, and the required performance is exhibited. The knitting method to be done is fine.

6A and 6B show an embodiment of the weft knit 22a of the knit 22 with respect to the knit 22 used for the current collector 10, and FIG. 6B shows an embodiment of the vertical knit 22b of the knit 22. Is shown. Knit 22 is also referred to as knitted fabric or knitted fabric, and refers to a cloth or product composed of continuous stitches. Since the knit 22 has elasticity in addition to the conductive thread 2 and the reforming catalyst 3 described above, it fits well in the gap between the interconnectors 106a and 106b and the power generation cell 107, and exhibits conductive performance and reforming performance. It has the property of being easily reformed. The horizontal knit 22a of the knit 22 includes a flat knit (Meliae knit) which is the basis of the horizontal knit 22a, a rubber knit having excellent elasticity, and a pearl knit in which the outer material and the lining have the same appearance.

(Fuel cell system configuration)
The current collector 10 is inserted between the interconnectors 106a and 106b of the cell stack 110 of the fuel cell and the power generation cell 107, and reforms hydrocarbons, which are fuel gases supplied to the fuel cell, inside the stack 110. Therefore, the performance of the fuel cell system 100 into which the current collector 10 is inserted is required to have a low contact resistance value and high reforming characteristics. The experimental results regarding the contact resistance value and the reforming characteristic ground of the fuel cell system 100 according to the present invention will be described below.

(Contact resistance value of current collector)
FIG. 7 shows a graph of the measurement result of the ASR (contact resistance value) of the woven fabric 8 using the conductive material such as the metal wire 4 as the current collecting material 10. The horizontal axis is the load (kgf) pressurized from the vertical direction of the cell stack 110, and was measured in the range of 7 kgf to 50 kgf. The vertical axis shows the measurement result of the contact resistance value (mΩ · cm) of the cell stack 110. The current collector 10 used in the test is a current collector 10 made of a covering twisted yarn 7 carrying a ceramic fiber / Ni. The higher the contact resistance value is, the larger the resistance is, and the performance as the current collector 10 is not preferable. The lower the contact resistance value is, the smaller the resistance is and the performance as the current collector 10 is preferable. The experiment was carried out with 6 types of test bodies: test body A: φ50 μm, test body B: φ100 μm, test body C: φ120 μm, test body D: no insertion, test body E: Ni60 μm mesh, and test body F: porous metal. rice field. In the porous metal test piece F, the contact resistance value showed a high value at a load of 7 kgf, but decreased linearly until the load reached 16 kgf. The non-inserted test piece D showed the highest contact resistance value at the end, and the test piece E, which was a Ni 60 μm mesh, showed the next highest contact resistance value. Specimen A: φ50 μm, Specimen B: φ100 μm, and Specimen C: φ120 μm showed extremely low contact resistance values regardless of the load. By this experiment, the contact resistance value of the current collector 10 (test bodies A, B, C) according to the present invention is significantly reduced as compared with the non-insertion (test body D) and the conventional product (test bodies E, F). I was able to confirm that.

(Modification characteristics of current collector)
FIG. 8 is a graph showing the measurement results of the reforming characteristics of the current collector according to the present invention. The vertical axis of the graph is the Cell voltage (V) on the left side and the output (W) / Cell on the right side. The measurement is a measurement result (indicated by a solid line) in the case of methane gas based on a measurement result in the case of dry hydrogen (indicated by a broken line), and the power generation temperature is 750 ° C. The current collector 10 used in the test is a current collector made of a covering twisted yarn 7 carrying a ceramic fiber / Ni.

Regarding the configuration, shape, size, and arrangement relationship of the current collector thread 1, the current collector 10 composed of the current collector thread 1, and the fuel cell system 100 using the current collector 10 described in the above embodiments. Is merely schematic to the extent that the present invention can be understood and implemented. Therefore, the present invention is not limited to the described embodiment, and can be changed to various embodiments as long as it does not deviate from the scope of the technical idea shown in the claims.

1 Current collector thread (with internal modification function), 2 Conductive thread, 3 Modified catalyst thread, 4 Metal wire, 5 Ceramic fiber, 6-core material, 7 Covering twisted yarn, 7a Single covering twisted yarn, 7b Double covering twisted yarn, 8 woven fabric (structure), 10 (with internal modification function) current collector, 10a air pole side current collector, 10b fuel pole side current collector, 12 warp (or warp), 13 weft (or weft) ), 14 Single-twisted yarn, 15 Multi-twisted yarn, 16 Top winding, 17 Bottom winding, 18 Plain weave, 19 Oblique weave, 19a Double-sided oblique weave, 19b Single-sided oblique weave, 20 Zhu child weave, 21 Nickel particles, 22 knit, 22a Horizontal edition, 22b vertical edition, 100 (with internal reforming function) fuel cell system, 100a fuel cell power generation unit, 100b hot water supply unit, 102 single cell, 103 air electrode (cathode), 104 fuel cell (anodide), 105 Electrolyte, 106 Interconnector, 106a Air pole side interconnector, 106b Fuel pole side interconnector, 107 (power generation) cell, 108 Fuel gas supply path, 109 Oxidation gas supply path, 110 (cell) stack, 111 Fuel gas desulfurizer , 112 Fuel gas reformer, 113 Exhaust gas heat exchanger, 114 Ion exchange resin, 115 Hot water storage tank, P pressure.

Claims (6)

A yarn for a current collector provided between the interconnector inside the stack of a solid oxide fuel cell and a cell, which is a conductive yarn having a current collecting characteristic and a reformer having an internal reforming function of fuel gas. A thread for a current collector, characterized in that it is twisted with a catalyst thread. A current collector provided between the interconnector inside the stack of a solid oxide fuel cell and the cell, a conductive yarn with current collection characteristics and a reforming catalyst yarn with an internal reforming function for fuel gas. A current collector characterized by forming a woven fabric. The current collector according to claim 2, wherein the woven fabric is formed by a twisted yarn structure in which the reformed catalyst yarn and the conductive yarn are twisted together. The current collecting material according to claim 2, wherein the woven fabric is formed by using either one of the modified catalyst yarn and the conductive yarn as a warp and a weft. The current collector according to any one of claims 2 to 4, wherein the reformed catalyst thread is a ceramic fiber, and the conductive thread is a metal wire. A fuel cell system using the current collector according to any one of claims 2 to 5, which is inserted between the interconnector and the cell inside the stack and supplied to the solid oxide fuel cell. A fuel cell system using a current collector, characterized in that the hydrocarbon of the fuel gas is reformed inside the stack.

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