KR102207387B1 - Solid oxide fuel cell - Google Patents

Abstract

The present invention relates to a solid oxide fuel cell, and more particularly, a sacrificial cell module including a material that reacts with chromium is configured at the front end of the unit cell module, and the sacrificial cell module is a solid oxide fuel. The present invention relates to a solid oxide fuel cell that effectively prevents chromium poisoning by reducing the movement of chromium by adsorbing chromium generated while the battery is driven.

Description

Solid oxide fuel cell {SOLID OXIDE FUEL CELL}

The present invention relates to a solid oxide fuel cell, and more particularly, a sacrificial cell module including a material that reacts with chromium is configured at the front end of the unit cell module, and the sacrificial cell module is a solid oxide fuel. The present invention relates to a solid oxide fuel cell that effectively prevents chromium poisoning by reducing the movement of chromium by adsorbing chromium generated while the battery is driven.

Recently, as existing energy resources such as oil and coal are depleted, interest in alternative energy that can replace them is increasing. As one of these alternative energies, the unit cell is attracting attention, and research is being actively conducted due to the advantage of being highly efficient and rich in fuel without emitting pollutants. In general, the unit cell has a cathode and an anode formed on both sides of the electrolyte, and the anode is the anode and the cathode is the cathode. When fuel is supplied to the anode, the fuel is oxidized and electrons are released through an external circuit, and oxygen is supplied to the cathode. If so, it receives electrons from an external circuit and is reduced to oxygen ions. The reduced oxygen ions move to the anode through the electrolyte and react with the oxidized fuel to produce water. Among these unit cells, the solid oxide unit cell (SOFC) is a unit cell operated at a high temperature of about 600°C to 1000°C using stabilized zirconia as an electrolyte, and other applications include carbonate unit cell (MCFC), phosphoric acid unit cell (PAFC). ), high-molecular unit cell (PEFC), and other types of unit cells, which are the most efficient, have less pollution, have no electrolyte loss, and do not require electrolyte replenishment.

Meanwhile, the solid oxide fuel cell in which the solid oxide unit cells are stacked is classified into a flat plate type, a tubular type, and a flat tube type, and the shape can be classified according to a structure in which the solid oxide unit cells are arranged. Such a solid oxide fuel cell operates at a high temperature of 600°C or higher. At this time, volatilization of chromium occurs in the absence of a metal material in the solid oxide fuel cell, and the volatilization of this chromium occurs in particular, the cathode and the cathode of the solid oxide fuel cell. Chromium poisoning occurs at the electrolyte interface, which degrades the durability of the fuel cell. Accordingly, in the conventional solid oxide fuel cell, the volatilization of chromium can be prevented by forming a barrier film between the cathode and the interconnect.

However, in the case of such a conventional solid oxide fuel cell, there is a problem in that there is a limitation in preventing chromium poisoning at the interface between the cathode and the electrolyte due to volatilization of chromium, and in particular, it cannot effectively prevent chromium poisoning at the interface between the cathode and the electrolyte. Had a problem.

In addition, such a conventional solid oxide fuel cell has a problem that the process process of the solid oxide fuel cell is complicated by adding a process of configuring a separate barrier film in the fuel cell, and in particular, the cost of the overall system is increased due to the additional process. Had a problem.

Accordingly, the present inventors constructed a sacrificial cell module including a material that reacts with chromium at the front end of the unit cell module in order to solve the problem of the conventional solid oxide fuel cell described above, and the sacrificial cell module The present invention relates to a solid oxide fuel cell that effectively prevents chromium poisoning by reducing the movement of chromium by adsorbing chromium generated while the solid oxide fuel cell is driven.

Japanese Patent No. 05607903

An object of the present invention according to an embodiment is to configure a sacrificial cell module including a material that reacts with chromium at the front end of the unit cell module, and the sacrificial cell module is generated while the solid oxide fuel cell is driven. It is intended to provide a solid oxide fuel cell capable of effectively preventing chromium poisoning between a cathode and an electrolyte interface in a fuel cell by performing an adsorption reaction with volatile chromium.

In addition, an object of the present invention according to an embodiment is to configure the sacrificial cell module, which does not require a complicated process, at the front end of the unit cell module, thereby preventing chromium poisoning and maintaining the overall system price. It is to provide an oxide fuel cell.

The solid oxide fuel cell according to the present invention includes: a unit cell module including a unit cell and an interconnect disposed on both sides of the unit cell; And a sacrificial cell module including a sacrificial cell and an interconnector disposed on both sides of the sacrificial cell, wherein the sacrificial cell includes a material that reacts with chromium to reduce the movement of chromium It is characterized by being.

According to an embodiment, the material is characterized in that it contains lanthanum strontium cobalt oxide (La _{1 -x} Sr _x CoO ₃ ).

According to an embodiment, the sacrificial cell is characterized in that the content of lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ) is higher than that of the unit cell.

According to an embodiment, the sacrificial cell module is located at a front end of the unit cell module.

According to an embodiment, the solid oxide fuel cell is one of a planar type solid oxide fuel cell, a tube type solid oxide fuel cell, and a flat-tube type fuel cell. It characterized in that it is provided as a battery.

According to an embodiment, the unit cell module and the sacrificial cell module are electrically separated by a separation distance formed between the unit cell module and the sacrificial cell module or an insulator is disposed.

According to an embodiment, the solid oxide fuel cell further includes an electric loader for separately driving the sacrificial cell module.

According to an aspect of the present invention, a sacrificial cell module including a material that reacts with chromium is configured at the front end of the unit cell module, and the sacrificial cell module includes volatile chromium generated while the solid oxide fuel cell is driven. There is an advantage of effectively preventing chromium poisoning between the cathode and the electrolyte interface in the fuel cell by performing an adsorption reaction.

In addition, by configuring the sacrificial cell module, which does not require a complicated process, at the front end of the unit cell module, there is an advantage of preventing chromium poisoning and maintaining the overall system price as it is.

1 is a diagram schematically showing a configuration of a solid oxide fuel cell 1000 according to an embodiment of the present invention.
2 is a diagram schematically showing the configuration of a sacrificial cell module 100 according to an embodiment of the present invention.
3 is a view schematically showing the configuration of the sacrificial cell 110 according to an embodiment of the present invention.
4 is a diagram schematically showing the configuration of a unit cell module 200 according to an embodiment of the present invention.

The present invention will be described in detail with reference to the accompanying drawings as follows. Here, repeated descriptions and detailed descriptions of known functions and configurations that may unnecessarily obscure the subject matter of the present invention will be omitted. Embodiments of the present invention are provided to completely explain the present invention to those with average knowledge in the art. Accordingly, the shapes and sizes of elements in the drawings may be exaggerated for clearer explanation.

Throughout the specification, when a part "includes" a certain constituent element, it means that other constituent elements may be further included rather than excluding other constituent elements unless there is a specific contrary mechanism.

Hereinafter, a preferred embodiment is presented to aid the understanding of the present invention. However, the following examples are only provided to more easily understand the present invention, and the contents of the present invention are not limited by the examples.

<Solid Oxide Fuel Cell>

1 is a diagram schematically showing a configuration of a solid oxide fuel cell 1000 according to an embodiment of the present invention, and FIG. 2 is a diagram schematically showing a configuration of a sacrificial cell module 100 according to an embodiment . In addition, FIG. 3 is a diagram schematically showing a configuration of a sacrificial cell 110 according to an embodiment, and FIG. 4 is a diagram schematically showing a configuration of a unit cell module 200 according to an embodiment.

The solid oxide fuel cell 1000 according to an embodiment of the present invention includes a sacrificial cell module 100, a unit cell module 200, a first gas supply unit 300, a second gas supply unit 400, and an electric loader 500. ), and the sacrificial cell module 100 may include a sacrificial cell 110 and an interconnector 120, and the unit cell module 200 includes a unit cell 210 and an interconnector. It can be configured to include 220.

Here, the solid oxide fuel cell 1000 is a solid oxide fuel cell of one of a planar type solid oxide fuel cell, a tube type solid oxide fuel cell, and a flat-tube type fuel cell. Can be provided as

That is, the sacrificial cell module 100, the unit cell module 200, the first gas supply unit 300, the second gas supply unit 400, and the electric loader 500 are arranged according to the shape of the solid oxide fuel cell 1000 The structure can be different.

In one embodiment, when the solid oxide fuel cell 1000 is provided in the form of a flat solid oxide fuel cell, the sacrificial cell module 100 and the unit cell module 200 may be arranged in a vertically stacked form. , As an insulator is disposed between the unit cell module 200 and the sacrificial cell module 100 or a physically spaced distance is formed, the unit cell module 200 and the sacrificial cell module 100 may be electrically separated.

For example, a mica material is disposed between the interconnector 220 of the unit cell module 200 and the interconnector 120 of the sacrificial cell module 100 located at the front end of the unit cell module 200 Accordingly, the sacrificial cell module 100 and the unit cell module 200 are electrically separated and thus can be driven separately.

First, the number of sacrificial cell modules 100 may be one or more, and may be configured in the solid oxide fuel cell 1000, and may be configured less than the number of unit cell modules 200.

The sacrificial cell module 100 may be located at a front end of the unit cell module 200 within the solid oxide fuel cell 1000, where the front end of the unit cell module 200 is a position where gas is first supplied. It can be said to be the location where gas is first encountered.

For example, if the first gas supply unit 300 and the second gas supply unit 400 are formed at the upper end, the sacrificial cell module 100 is a solid oxide fuel cell 1000 as a front end of the unit cell module 200. When the first gas supply unit 300 and the second gas supply unit 400 are formed at the lower end, the sacrificial cell module 100 is a solid oxide fuel as a front end of the unit cell module 200. It may be disposed on the lower end of the battery 1000.

In the sacrificial cell module 100, the sacrificial cell 110 may be located between the interconnectors 120 and the size of the sacrificial cell 110 is smaller than or equal to the size of the interconnector 120, and the sacrificial cell 110 The shape of and the shape of the interconnector 120 may be provided identically to each other. In this case, the thickness of the sacrificial cell 110 may be equal to or thicker than the thickness of the unit cell 210 to be described later.

2 and 3, the sacrificial cell 110 may be configured to include the cathode current collector 11, the cathode 12, the electrolyte 13, the anode 14, and the anode current collector 15. The cathode 12 may be configured as a cathode, and the anode 14 may be configured as an anode.

The cathode current collector 11 is in contact with the interconnector 120 on the upper side of the sacrificial cell 110, is located on the outer side of the cathode 12, and may serve to collect electricity from the cathode 12, and the cathode current collector (11) is a material that undergoes an adsorption reaction with chromium and may include lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ), and may have a thickness of 1 μm to 10 mm.

In the cathode current collector 11, in addition to lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ) capable of adsorbing chromium, lanthanum strontium manganese oxide (La _{1 - x} Sr _x MnO ₃ ) and lanthanum strontium iron oxide (La _{1 - x} Sr _x FeO ₃ ) It may be composed of one or more materials.

Lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ) contained in the cathode current collector 11 is a material that undergoes an adsorption reaction with chromium and has the same or more content as other materials included in the cathode current collector 11. There may be many, and for this reason, the adsorption of chromium may most actively occur in the cathode current collector 11 of the sacrificial cell 110.

In more detail, when gas is supplied to the solid oxide fuel cell 1000, a metal connector (not shown) including an interconnector 120 that first comes into contact with the gas before the gas is supplied to the unit cell module 200. Not shown), a reformer (not shown) and a heat exchanger (not shown) may be oxidized to generate volatile chromium (CrO ₂ (OH)).The metal connector including the interconnector 120, the reformer and the heat exchanger are metal It is formed of a material and can be exposed to high temperature areas.

At this time, the volatile chromium generated when the metal connector including the interconnector 120, the reformer and the heat exchanger are oxidized, moves to the cathode current collector 11 adjacent to the interconnector 120 and is transferred to the cathode current collector 11 It may react with the contained lanthanum strontium cobalt oxide (La _{1 -x} Sr _x CoO ₃ ).

Here, the lanthanum strontium cobalt oxide (La _{1 -x} Sr _x CoO ₃ ) included in the cathode current collector 11 reacts with chromium generated in the metal connector including the interconnector 120, the reformer, and the heat exchanger. As a result, the movement of chromium is reduced, thereby preventing chromium poisoning occurring between the cathode 12 and the electrolyte 13, and chromium components present in the solid oxide fuel cell 1000 Can reduce

That is, when the solid oxide fuel cell 1000 is driven at a high temperature of 600 to 800°C, volatile chromium may be generated as the metal connector including the interconnector 120, the reformer, and the heat exchanger are oxidized. The lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ) contained in the cathode current collector 11 before reacting with oxygen and water vapor and poisoning the active area at the interface of the cathode 12 and the electrolyte 13 is volatile chromium And adsorption reaction.

Accordingly, by adsorbing chromium, including a material that reacts with chromium in the cathode current collector 11, the movement of chromium can be reduced, and chromium components present in the solid oxide fuel cell 1000 can be reduced. By preventing the chromium poisoning phenomenon, it is possible to prevent deterioration of the performance of the solid oxide fuel cell 1000.

In addition, the content of lanthanum strontium cobalt oxide (La _1-x Sr _x CoO ₃ ) included in the cathode current collector 11 of the sacrificial cell 110 is included in the cathode current collector 21 of the unit cell 210 to be described later. It may be greater than the content of the lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ). In this case, the thickness of the cathode current collector 11 of the sacrificial cell 110 is the cathode current collector of the unit cell 210 to be described later ( It can be equal to or thicker than the thickness of 21).

For example, lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ) is included in the cathode current collector 11 of the sacrificial cell 110 in an amount of 35%, and lanthanum strontium cobalt iron oxide (La _1-x If Sr _x Co _1-y Fe _y O ₃ ) is not included, lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ) is 10% in the cathode current collector 21 of the unit cell 210, Lanthanum strontium cobalt iron oxide (La _1-x Sr _x Co _1-y Fe _y O ₃ ) may be included in an amount of 27%.

That is, the cathode current collector 11 of the sacrificial cell 1100 contains more lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ) that reacts with chromium, so that the cathode current collector of the unit cell 210 ( A reaction of adsorbing chromium in the cathode current collector 11 of the sacrificial cell 110 may occur more actively than 21).

Accordingly, due to the volatile chromium adsorption reaction of the cathode current collector 11 of the sacrificial cell 110, the chromium component present in the solid oxide fuel cell 1000 decreases, and the cathode 22 and the cathode of the unit cell 210 As the chromium poisoning phenomenon that may occur between the electrolytes 23 is effectively reduced, deterioration of the performance of the solid oxide fuel cell 1000 can be prevented and stability can be ensured.

In addition, a simple process of increasing the content of lanthanum strontium cobalt oxide (La _1-x Sr _x CoO ₃ ) in the cathode current collector 11 of the sacrificial cell 110 is a complex process such as ceramic coating to prevent metal Cr from volatilization. There is no need for this, and the overall system price of the solid oxide fuel cell 1000 can be maintained as it is.

Next, the cathode 12 may reduce the gas supplied to the solid oxide fuel cell 1000 adjacent to the cathode current collector 11 to oxygen ions, and by continuously flowing air through the cathode 12, a constant partial pressure of oxygen Can keep.

At this time, the cathode 12 may be composed of a cathode support layer (CSL) and a cathode funtional layer (CFL). The CFL may be provided as a porous membrane, and the CSL is provided with the same thickness as the CFL or a thicker thickness. 12) can serve as a support layer, and can be formed with excellent electrical conductivity.

The cathode 12 is lanthanum strontium cobalt iron oxide (La _{1 - x} Sr _x Co _{1 - y} Fe _y O ₃ ), barium strontium cobalt iron oxide (Ba- _{1- x} Sr _x Co _{1 - y} Fe _y O ₃ ), Lanthanum strontium manganese oxide (La _{1 -x} Sr _x MnO ₃ ) and samarium strontium cobalt oxide (Sm _{1 - x} Sr _x CoO ₃ ) may be composed of one or more materials, so that gas can be easily diffused into It may have a porous shape, and the thickness of the cathode 12 may be 10 nm to 100 μm.

Next, the electrolyte 13 should be positioned between the cathode 12 and the anode 14, and should be dense so that gas and fuel are not mixed, and the conductivity of oxygen ions should be high and the electron conductivity should be low.

In this case, the material constituting the electrolyte 13 may include at least one or more of zirconia-based, ceria-based, and lanthanum gallate-based, and the thickness of the electrolyte 13 may be 10 nm to 100 μm.

Next, the anode 14 is located on one side of the electrolyte 13 and plays a role of electrochemical oxidation and charge transfer of the fuel. At this time, the anode 14 includes an ASL (Anode Support Layer) and AFL (Anode Functional Layer). can do.

The AFL is provided in the form of a porous membrane, and the ASL is provided in the same or thicker thickness as the AFL, thereby serving as a supporting layer of the anode 14, and can be formed with excellent electrical conductivity.

The anode 14 may include a zirconia-based, ceria-based, and lanthanum gallate-based material that forms the electrolyte 13, and a cermet in which nickel oxide, etc., are mixed, and Ni/YSZ thermal or Ru/YSZ One or more of the thermals may be included, or pure metals such as Ni, Co, Ru, and Pt may be used as the material of the anode 14.

The anode 14 may additionally contain activated carbon as needed, and by being configured in a porous form, it is possible to provide a path through which fuel gas can be easily diffused and oxygen ions can move, and the thickness of the anode 14 is It may be 10nm to 1000μm.

The anode current collector 15 is in contact with the interconnector 120 on the lower side of the sacrificial cell 110 and is located on the outer side of the anode 14 to collect electricity from the anode 14. At this time, the anode The thickness of the current collector 14 may be 10 nm to 100 μm.

Next, in the sacrificial cell module 100, the interconnector 120 is located above and below the sacrificial cell 110 so that when the one or more sacrificial cells 110 are driven, the one or more sacrificial cells 110 are electrically connected to each other. You can make it possible to communicate.

At this time, the interconnector 120 is in the form of a solid, and is chromium (Chromium), iron (Fe), carbon (C), copper (Cu), nickel (Ni), manganese (Mn), cobalt (Co), titanium (Ti). ), lithium (Li), tungsten (W), rubidium (Rb), and niobium (Nb), and may be made of a material such as metal, ceramic, and glass.

The structures of the upper and lower sides of the interconnector 120 may include one or more of a shape having an uneven shape or a flat shape, and in the case of a shape having an uneven shape, a shape in which protrusions and grooves are repeated.

In the case of the interconnector 120 having an uneven shape, the protrusion may be in contact with one surface of the sacrificial cell 110, thereby helping one or more sacrificial cells 110 to communicate with each other.

In addition, in the case of the interconnector 120 having a flat shape, the entire surface of the interconnector 120 is in contact with one surface of the sacrificial cell 110 to help the one or more sacrificial cells 110 communicate with each other. Can give.

The interconnector 120 may be formed larger than the size of the sacrificial cell 110, and may be formed in the same shape as the sacrificial cell 110.

For example, the interconnector 120 may be formed of a metal material of ferritic stainless steel containing 13% or more of chromium and may be provided in a square shape, and the sacrificial cell 110 is provided in a square shape similar to the interconnector 120 And the size may be smaller than the size of the interconnector 120.

Next, one or more unit cell modules 200 may be configured in the solid oxide fuel cell 1000, and may be configured to be larger than the number of sacrificial cell modules 100.

The unit cell 210 and the interconnector 220 of the unit cell module 200 may be provided in the same shape and size as the sacrificial cell 110 and the interconnector 120 of the sacrificial cell module 100 described above, The material of the interconnector 220 of the unit cell module 200 may be the same as the material of the interconnector 120 of the sacrificial cell module 100 described above.

For example, if the interconnector 120 of the sacrificial cell module 100 is formed of a ferritic stainless steel material containing 13% chromium, the interconnector 220 of the unit cell module 200 is also formed of the same material. Accordingly, the two interconnectors 120 and 220 may have the same thickness.

Wherein the lanthanum strontium cobalt oxide contained in the sacrificial cell 110 _{- - (x} Sr _x CoO ₃ La ₁₎ (La _{1 x} Sr _x CoO _3), lanthanum strontium cobalt oxide the content is included in the unit cell 210 of It is more than the content, and accordingly, the thickness of the sacrificial cell 110 is 150 μm and the thickness of the unit cell 210 is 100 μm, and the thickness of the sacrificial cell 110 is thicker, so that the thickness of the sacrificial cell module 100 is a unit cell module. It can be thicker than the thickness of 200.

Referring to FIG. 4, the unit cell 210 of the unit cell module 200 includes a cathode current collector 21, a cathode 22, an electrolyte 23, an anode 24, and an anode current collector 25. The configuration of the cathode 22, the electrolyte 23, the anode 24, and the anode current collector 25 is similar to that of the sacrificial cell 110 described above, so it will be omitted and only different configurations will be described. .

The cathode current collector 21 of the unit cell 210 may include lanthanum strontium cobalt iron oxide (La _{1 -x} Sr _x Co _1-y Fe _y O ₃ ), in addition to lanthanum strontium manganese oxide (La _{1 -x} Sr). _x MnO _3), lanthanum strontium iron oxide (La _{1 -} may be configured to include one or more of _x Sr _x FeO ₃₎ and samarium strontium cobalt oxide _{(Sm 1-x Sr x CoO} 3).

Next, the first gas supply unit 300 and the second gas supply unit 400 may supply gas into the solid oxide fuel cell 1000, wherein oxygen gas (O ₂ ) is supplied to the first gas supply unit 300 And, hydrogen gas (H ₂ ) may be supplied to the second gas supply unit 400.

The first gas supply unit 300 is disposed in the upper interconnector 120 of the sacrificial cell module 100 and the upper interconnector 220 of the unit cell module 200 to provide oxygen to the sacrificial cell module 100 first? Gas is supplied, and oxygen gas can be supplied to the cathode current collector 11 and the cathode 12 of the sacrificial cell 110, and then oxygen gas is supplied to the unit cell module 200 so that the cathode of the unit cell 210 Oxygen gas may be supplied to the current collector 21 and the cathode 22.

The first gas supply unit 300 may supply oxygen gas to the cathodes of the sacrificial cell module 100 and the unit cell module 200. Accordingly, the cathode 12 and the unit cell 210 of the sacrificial cell 110 The cathode 22 may reduce the supplied oxygen gas to oxygen ions.

Oxygen gas supplied from the first gas supply unit 300 comes into contact with the interconnector 120 of the sacrificial cell module 100 and the interconnector 120 is oxidized to generate volatile chromium. At this time, the air electrode of the sacrificial cell 110 The lanthanum strontium cobalt oxide (La _1-x Sr _x CoO ₃ ) in the current collector 11 reacts with the volatile chromium component generated in the interconnector 120, thereby adsorbing chromium present in the solid oxide fuel cell 1000. It is possible to reduce components and effectively reduce a chromium poisoning phenomenon that may occur between the cathode 22 of the unit cell 210 and the electrolyte 23.

The first gas supply unit 300 is in the form of a solid, and is chromium (Chromium), iron (Fe), carbon (C), copper (Cu), nickel (Ni), manganese (Mn), cobalt (Co), titanium (Ti). ), lithium (Li), tungsten (W), rubidium (Rb), and niobium (Nb). It may be made of a material such as metal, ceramic, and glass.

Next, the second gas supply unit 400 is disposed in the lower interconnector 120 of the sacrificial cell module 100 and the lower interconnector 220 of the unit cell module 200, so that the anode current collector of the sacrificial cell 110 ( 15) and the anode 14 may be supplied with hydrogen gas, and at the same time, hydrogen gas may be supplied to the anode current collector 25 and the anode 24 of the unit cell 210.

The second gas supply unit 400 may supply hydrogen gas to the anode of the sacrificial cell module 100 and the unit cell module 200, and the anode 14 of the sacrificial cell 110 and the anode of the unit cell 210 The hydrogen gas supplied to 24 may serve as fuel in the solid oxide fuel cell 1000.

In more detail, when hydrogen gas supplied from the second gas supply unit 400 is supplied as fuel to the anodes 14 and 24, hydrogen gas, which is a fuel, is oxidized and electrons are released.

At this time, the oxygen gas supplied from the first gas supply unit 300 to the cathodes 12 and 22 is reduced to oxygen ions by receiving electrons emitted while the hydrogen gas as fuel is oxidized, and the reduced oxygen ions are converted into electrolytes 13 and 33 ) Through the anode (14, 24) and reacts with the oxidized fuel (H ⁺ ) to generate water.

Next, the electric loader 500 separately drives only the sacrificial cell module 100 of the solid oxide fuel cell 1000, and does not affect the driving of the unit cell module 200.

In other words, even if the unit cell module 200 is not driven, the electric loader 500 constantly adsorbs chromium generated from the interconnectors 120 and 220 by separately driving the sacrificial cell module 100, thereby adsorbing the solid oxide fuel cell ( It is possible to effectively prevent the phenomenon of chromium poisoning occurring at the interface between the cathodes 12 and 22 of 1000) and the electrolytes 13 and 23.

Next, the solid oxide fuel cell 1000 fixes the sacrificial cell 110, the unit cell 210, and the interconnectors 120 and 220 to their original positions within the sacrificial cell module 100 and the unit cell module 200. It may be configured to further include a sealing material (not shown) that can be made.

The sealing material may be composed of one or more of rubber, silicon, high molecular material, metal, ceramic, and glass. At this time, the sealing material is the interconnectors 120 and 220 in the sacrificial cell module 100 and the unit cell module 200 Can be placed on one side of the edge.

<Example>

The sacrificial cell contained a greater amount of lanthanum strontium cobalt oxide (La _{1 -x} Sr _x CoO ₃ ) than the unit cell.

<Experimental Example>

Lanthanum strontium cobalt oxide ( La _{One - x} Sr _x CoO ₃ ) According to the content Sacrificial cell And Unit cell Comparison of chromium content in

In the 10-4Pa atmosphere, air containing chromium components first passed through a sacrificial cell with a higher content of lanthanum strontium cobalt oxide (La _1-x Sr _x CoO ₃ ) than a unit cell, and the air passed through the sacrificial cell was lanthanum strontium cobalt. The content of oxide (La _{1 - x} Sr _x CoO ₃ ) was supplied to the unit cell less than the sacrificial cell.

At this time, the unit cell supplied with air passing through the sacrificial cell was measured for 100 hours, and then the chromium getter LSC part of the sacrificial cell and the unit cell and the cathode part of the sacrificial cell were ionized using inductively coupled plasma. Subsequently, information from the ionized chromium ions was introduced into a mass spectrometer and an emission spectrometer for qualitative and quantitative analysis.

As a result, lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ) content of the chromium getter LSC portion of the sacrificial cell and the cathode of the sacrificial cell was measured as 4 to 11 ppm, and the lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ) The chromium getter LSC portion of the unit cell and the chromium component content of the cathode were measured to be 0.4 ppm.

This is because the lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ) content reacts in which most of the chromium components are adsorbed first in the sacrificial cell, so less chromium component content was measured in the unit cell, whereas lanthanum strontium cobalt In the sacrificial cell with more oxide (La _{1 - x} Sr _x CoO ₃ ) content than the unit cell, a larger chromium content was measured.

Through this result, when a solid oxide fuel cell is constructed including a sacrificial cell with a higher content of lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ) than the unit cell, the solid oxide fuel cell is formed by adsorbing most of the chromium components in the sacrificial cell. It can be seen that the chromium content in the fuel cell is reduced and the chromium poisoning phenomenon is prevented.

Although it has been described with reference to the preferred embodiments of the present invention, those of ordinary skill in the art can variously modify and change the present invention without departing from the spirit and scope of the present invention described in the following claims. You will understand that you can do it.

1000: solid oxide fuel cell
100: sacrificial cell module
110: sacrificial cell
120, 220: interconnect
11: air cathode current collector
12, 22: air cathode
13, 23: electrolyte
14, 24: anode
15, 25: anode current collector
120, 220: interconnect
200: unit cell module
210: unit cell
21: cathode current collector
300: first gas supply unit
400: second gas supply unit
500: electric loader

Claims (7)

As a flat-type solid oxide fuel cell,
A unit cell module including a unit cell and an interconnect disposed on both sides of the unit cell; And
Including; a sacrificial cell module including a sacrificial cell and an interconnector disposed on both sides of the sacrificial cell,
A separation distance is formed between the unit cell module and the sacrificial cell module, and an insulator is disposed to enable physical and electrical separation,
The sacrificial cell module includes a material that adsorbs chromium to the cathode current collector to reduce the movement of chromium,
The sacrificial cell contains more lintanium strontium cobalt oxide (La _1-x Sr _x CoO ₃ ) than the unit cell,
Further comprising an electric loader separately driving the sacrificial cell module,
The electric loader is characterized in that it separately drives the sacrificial cell module without affecting the driving of the unit cell module,
Solid oxide fuel cell.
The method of claim 1,
The substance,
It characterized in that it comprises lanthanum strontium cobalt oxide (La _{1 - x} Sr _x CoO ₃ ),
Solid oxide fuel cell.
delete The method of claim 1,
The sacrificial cell module,
It characterized in that it is located at the front end of the unit cell module,
Solid oxide fuel cell.
delete delete delete

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