JP2006069828A - Oxygen pump element and oxygen feeder having the same - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To sufficiently gas-seal spaces divided into both sides via a plurality of solid electrolytes, and to stably join connected metal foil members to each other even in the case of rapid thermal shock to an oxygen pump element. <P>SOLUTION: The oxygen pump element is provided with: a plurality of solid electrolytes 7 having oxygen ion conductivity; electrode membranes 8, 9 formed on both the sides of the solid electrolytes 7 having oxygen ion conductivity and composing both positive and negative poles; and metal foil members 15 joined with the outer circumferential part of the electrode membrane on the positive electrode side or the outer circumferential part of the electrode membrane on the negative electrode side. The plurality of electrodes in the oxygen pump element are formed in a series circuit, and the plurality of metal foil members 15 are connected via a glass ceramic layer 24. Thus, even in the case a plurality of solid electrolytes are connected to the series circuit, sufficient insulation is maintained, and further, gas sealing can be maintained without causing cracks or peeling even in the case of rapid thermal shock. <P>COPYRIGHT: (C)2006,JPO&NCIPI

Description

  The present invention relates to an oxygen pump element using an oxygen ion conductive solid electrolyte and an oxygen supply device equipped with the element.

  Conventionally, when this type of oxygen pump uses a plurality of oxygen ion conductive substrates at the same time, the electrode film on the same surface side is electrically connected by a lead wire or the like, and a power supply voltage is applied in parallel. (For example, refer to Patent Document 1).

FIG. 6 is a plan view of the oxygen pump described in Patent Document 1, and FIG. 7 is a cross-sectional view of the oxygen pump. Twenty-five oxygen ion conductive substrates 1 are shown and fixed to the support member 2. Lead wires 4 are drawn out from the peripheral portions of the respective electrode films 3 and gathered, and are connected to the wirings at the same potential. A lead wire 5 is drawn out from the wiring and connected to one pole of the power source. A lead 6 wire similarly drawn from the back surface is connected to the other pole of the power source.
JP-A-8-527485

  However, in the conventional configuration, since a plurality of oxygen ion conductive substrates are connected in parallel, a large current flows through the lead wire in which the lead wires are gathered. Therefore, there is a problem that it is necessary to use a sufficiently thick lead wire or a special lead wire having a small electric resistance. Moreover, heat may be generated in a portion having a small resistance such as a connection portion or a switch portion. Further, for example, when considering actual use at home, there is a problem that a current of several tens of amperes is more complicated than a voltage of several tens of volts (the cost is high).

  The present invention solves the above-described conventional problems, and provides a low-current oxygen pump, and sufficiently seals a space existing on both sides via a solid electrolyte, thereby causing a rapid thermal shock of the oxygen pump element. It is an object of the present invention to provide an oxygen pump element that can follow without causing cracks or peeling and an oxygen supply device having the oxygen pump element.

  In order to solve the above-mentioned conventional problems, an oxygen pump element of the present invention includes a plurality of oxygen ion conductive solid electrolytes and an electrode film constituting positive and negative electrodes formed on both surfaces of the oxygen ion conductive solid electrolyte. And a metal foil member joined to the positive electrode side outer peripheral part or the negative electrode side outer peripheral part, and the electrodes of the plurality of oxygen pump elements are configured in a series circuit, and the plurality of the metal foil members Is configured to be connected via a glass ceramic layer.

  As a result, the space divided on both sides through a plurality of solid electrolytes is sufficiently gas-sealed, and cracks or peeling from the metal foil members connected to each other against a sudden thermal shock of the oxygen pump element occurs. There is nothing.

  Further, the oxygen pump element, voltage applying means for applying a voltage to the oxygen pump element connected in a series circuit, voltage control means for controlling the voltage applying means, and heating means for heating the oxygen pump element A temperature control means for detecting the temperature of the oxygen pump element to control the heating means, a breathable heat insulating means for preventing thermal diffusion of the heating means and the oxygen pump element, and the oxygen pump element When the oxygen supply device is provided with mixing means for mixing the generated oxygen with air to form a mixed gas having a predetermined oxygen concentration, when a plurality of solid electrolytes are connected in a series circuit In addition, while maintaining a sufficient insulating property, it is possible to maintain a gas sealing property without causing cracks or peeling even with a sudden thermal shock.

  The oxygen pump element of the present invention can maintain sufficient insulation even when a plurality of oxygen pump elements are connected to a series circuit, and can maintain a gas seal without causing cracks or delamination against sudden thermal shock. .

  According to a first aspect of the present invention, there are provided a plurality of oxygen ion conductive solid electrolytes, electrode films constituting both positive and negative electrodes formed on both surfaces of the oxygen ion conductive solid electrolyte, and an electrode film outer peripheral portion or a negative electrode on the positive electrode side A metal foil member joined to the electrode film outer peripheral portion on the side, the electrodes of the plurality of oxygen pump elements are configured in a series circuit, and the plurality of metal foil members are connected via a glass ceramic layer Thus, even when a plurality of units are connected to a series circuit, sufficient insulation can be maintained, and sufficient gas sealing performance can be maintained without causing cracks or peeling even against a sudden thermal shock.

  The second invention is a crystallized glass in which the glass ceramic layer is SiO2-B2O3-MgO-BaO-based and contains 15 to 25 wt% of an alkaline earth metal oxide and 2 wt% or less of an alkali metal oxide. Thus, it has sufficient heat resistance and can have a substantially equivalent thermal expansion coefficient to the metal foil member. Moreover, since it joins by crystallized glass, it can have sufficient durability also with respect to the thermal shock by an oxygen pump element.

In the third invention, in particular, the thermal expansion coefficient of the glass ceramic layer in the first or second invention is 100 to 120 × 10 ⁻⁷ / ° C., so that the thermal expansion coefficient substantially equal to that of the metal foil member is obtained. Therefore, it is possible to cope with expansion and contraction distortion caused by severe thermal shock in practical use.

  The fourth invention is particularly configured as a partitioning means for partitioning a space part in contact with the solid electrolyte with respect to the metal foil member joined to the electrode film outer peripheral part on the positive electrode side or the negative electrode side of the first to third inventions. As a result, the space can be sufficiently partitioned without increasing the number of necessary components, and the specific heat can be reduced since the material is a thin metal foil, and the temperature can be raised and lowered in a short time.

  The fifth invention is a perovskite-type composite metal oxide mainly comprising lanthanum and gallium by using the solid electrolyte of any one of the first to fourth inventions as lanthanum gallate, It has oxygen ion conductivity at 400 ° C or higher. Therefore, since sufficient capability can be obtained by maintaining the operating temperature of the oxygen pump element at a relatively low temperature of about 600 ° C., deterioration of the oxygen pump element can be suppressed even in the long term.

  In the sixth aspect of the invention, in particular, a conductive film layer is formed at a joint portion with respect to the metal foil member having a connection structure with the electrode film of any one of the first to fifth aspects, and both side surface portions Since a conductive film communicating with the conductive film layer is formed with a predetermined width, a large current flows from the electrode film to the conductive film when used as an oxygen pump element. However, the oxidative corrosion of the metal foil can be prevented by the conductive film having a predetermined width.

  In the seventh aspect of the invention, in particular, a conductive film layer is formed at the bonding portion with respect to the metal foil member that is connected to the electrode film of any one of the first to fifth aspects of the invention, and at one surface portion. When the conductive film communicating with the conductive film layer is formed with a predetermined width and the glass ceramic film is formed with a predetermined width on the other surface portion, when used as an oxygen pump element, the electrode film is changed to the conductive film. Although a large current flows, the oxidative corrosion of the metal foil can be prevented by a conductive film having a predetermined width against a large amount of heat generated at this time. Moreover, since it is cheaper and has sufficient mechanical strength as compared with the conductive film, it is possible to maintain a degree of design freedom by improving the bending strength by devising the printing pattern.

  The eighth invention is particularly large in the conductive film formed on the metal foil member by setting the width of the conductive film of any one of the sixth or seventh invention or the width of the glass ceramic film to 3 to 7 mm. It was possible to prevent oxidative corrosion even when the vicinity of the junction with the electrode film was locally heated due to current flow, and the long-term stability of the oxygen pump element could be improved.

  In particular, the ninth invention is a plurality of oxygen pump elements according to any one of the first to eighth inventions, a voltage applying means for applying a voltage to the oxygen pump elements connected in a series circuit, and the voltage application. Voltage control means for controlling the means, heating means for heating the oxygen pump element, temperature control means for detecting the temperature of the oxygen pump element to control the heating means, and the heating means and the oxygen pump element By comprising a breathable heat insulating means for preventing thermal diffusion and a mixing means for mixing oxygen generated through the oxygen pump element with air to form a mixed gas having a predetermined oxygen concentration, a plurality of Even when a solid electrolyte is connected to a series circuit, it can maintain sufficient insulation and can maintain gas sealing performance without cracking or peeling even under sudden thermal shock.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. Note that the present invention is not limited to the embodiments.

(Embodiment 1)
FIG. 1 shows a cross-sectional configuration diagram of a solid electrolyte serving as an oxygen pump element according to the first embodiment of the present invention.

In FIG. 1, a solid electrolyte 7 is obtained by molding a sintered body of substitutional type lanthanum gallate (La _0.8 Sr _0.2 Ga _0.8 Mg _0.2 O ₃ ) into a flat plate having an arbitrary thickness. The positive electrode film 8 and the negative electrode film 9 are formed on the surface so as to exhibit oxygen ion conductivity. Here, description will be made assuming that the solid electrolyte has a size of 30 × 30 mm and a thickness of 100 μm.

For the positive electrode film 8 and the negative electrode film 9, a perovskite complex oxide having conductivity was used. Specifically, a paste obtained by mixing Sm _0.5 Sr _0.5 CoO ₃ with a cellulose-based vehicle as an organic solvent is formed by screen printing to form a printed film, dried, and fired at 1100 ° C. A positive and negative electrode film having a thickness of about 15 μm was formed.

  Further, Au porous conductive films 10 and 11 were laminated on the surfaces of the positive electrode film 8 and the negative electrode film 9. In this case, a printed film was formed by screen printing using Au paste, dried, and baked at 800 ° C. to form a conductive film having a thickness of about 3 μm. The conductive films 10 and 11 can improve the surface distribution unevenness of the solid electrolyte with respect to the potential when a voltage is applied between the positive and negative electrode films 8 and 9.

  FIG. 2 is a schematic configuration diagram of the oxygen pump element. Here, an oxygen pump element using four solid electrolytes will be described. It is disposed on the solid electrolytes 7, 12, 13, 14 and the metal foil members 15, 16, 17, 18. Each solid electrolyte is connected to a metal foil member having conductivity on the negative electrode film side. Fe-20Cr-5Al, 12 μm is used as the metal foil member, and an opening is provided so that the negative electrode film surface of the solid electrolyte is exposed. The positive electrode side of the solid electrolyte 7 is connected via a metal foil member 16 and a gold foil member 19, and the positive electrode side of the solid electrolyte 12 is connected via a metal foil member 17 and a gold foil member 20. The metal foil member 18 and the gold foil member 21 are connected to each other, the lead portion 22 is connected to the metal foil member 15, and the lead portion 23 is connected to the solid electrolyte 14. Since the individual metal foil members are connected in an insulated state, the four solid electrolyte elements are configured in series in terms of electrical circuits.

  3 is a cross-sectional view of the oxygen pump element in FIG. 2 taken along line A-A ′. In FIG. 3, the conductive film is not shown in order to simplify and explain the structure. The metal foil member 15 and the metal foil member 16 are bonded via a glass ceramic layer 24.

A conductive film 25 is formed with a width of 5 mm around the negative electrode film surface of the metal foil member 15 disposed with an opening so that the negative electrode film surface of the solid electrolyte 7 is exposed. A conductive film 26 is also formed with a width of 5 mm around the metal foil member 15 that does not contact the negative electrode film surface. For the conductive films 25 and 26, a printed film was formed by screen printing using an AgPd paste, dried, and then baked at 800 ° C. to form a conductive film having a thickness of about 3 μm. The glass ceramic layer is SiO2-B2O3-MgO-BaO-based, containing 20 wt% of an alkaline earth metal oxide and 0.5 wt% of an alkali metal oxide glass paste between metal foil members with an automatic discharge device. Then, it was formed by drying and baking at 800 ° C. The thermal expansion coefficient of the glass ceramic layer formed after firing is 110 × 10 ⁻⁷ / ° C., and the thermal expansion coefficient of the metal foil member Fe-20Cr-5Al is 115 × 10 ⁻⁷ / ° C.

  A conductive film 28 having a width of 5 mm is formed around the negative electrode film surface of the metal foil member 16 disposed with an opening so that the negative electrode film surface 27 of the solid electrolyte 12 is exposed. Similarly, a conductive film 29 having a width of 5 mm is formed around the metal foil member 16 that does not contact the negative electrode film surface. The positive electrode film side 8 of the solid electrolyte 7 is joined to the conductive film 28 of the metal foil member 16 communicating with the negative electrode film side of the solid electrolyte 12 by a gold foil member 19. Further, the positive electrode film side 30 of the solid electrolyte 12 is joined to the conductive film of the metal foil member 17 communicating with the negative electrode film side of the solid electrolyte 13 by the gold foil member 20.

  The metal foil members 15, 16, 17, and 18 arranged on the negative electrode film side of the solid electrolyte are also used as space partition means when oxygen is selectively transported by the solid electrolyte. Since the lead portion 22 and the lead portion 23 are arranged in the same direction with respect to the surface of the solid electrolyte, the structural layout configuration can be simplified in manufacturing the oxygen supply device.

  FIG. 4 shows a schematic cross-sectional configuration diagram of an oxygen supply apparatus using the oxygen pump element. Around the metal foil member which is a space partition means for the solid electrolyte, it is fixed to the support 32 with an electrically insulating gas sealant 31. Further, a voltage application means 33 is connected to the positive electrode side and the negative electrode side via a conducting wire, and a voltage control means 34 is connected to the voltage application means 33. The heater 36 constituting the heating unit 35 is disposed opposite to the surface on the negative electrode side, and a temperature control unit 37 having a unit 37 a for detecting the temperature of the solid electrolyte sends a signal to the heating unit 35.

  The means 37a for detecting the temperature of the solid electrolyte may be a temperature sensor or another method. In the case of a sensor, the sensor may be disposed in the vicinity of the solid electrolyte or may be disposed at an arbitrary position. Depending on the temperature of the solid electrolyte detected by the temperature control means 37, the temperature control means 37 performs input control of the heater 36 constituting the heating means 35.

  The heat insulating means 38 and 39 are breathable heat insulating members for suppressing the loss of heat generated by the heater 36. Here, the heat insulating material shape | molded in the flat form which has a silica and an alumina as a main component was used. Each element constituting the oxygen supply device and the container 40 for maintaining the overall shape are provided with an opening 41 for ventilation on the negative electrode membrane side.

  A gas mixing means 43 is connected to the positive electrode film side of the container 40 through a vent 42. The mixing unit 43 includes a gas induction pipe 44, a mixed gas introduction pipe 45, a gas mixer 46, and a gas pump 47.

  About the oxygen supply apparatus comprised as mentioned above, the operation | movement and an effect | action are demonstrated below. First, the oxygen supply device is placed in the atmosphere such as room air. At this time, atmospheric components such as nitrogen and oxygen (hereinafter simply referred to as nitrogen and oxygen) pass through the inside of the heat insulating means 38 and 39 which are air-permeable heat insulating materials constituting the oxygen pump device, and are on the positive electrode membrane side. And it is stable in a state of diffusing up to the surface on the negative electrode film side.

  In this state, when the heater 36 is energized by the temperature control means 37, the temperature of the solid electrolyte in the heat insulation means 38 and 39 rises. The temperature control means 37 energizes while controlling the heater 36 so that the temperature required for the operation of the solid electrolyte is about 600 ° C. However, this temperature is not limited, and operation at an arbitrary temperature is possible according to the characteristics of the solid electrolyte.

  When a voltage is applied to the solid electrolyte via the positive electrode film and the negative electrode film when the temperature at which the solid electrolyte can conduct ions is reached, oxygen in the vicinity of the surface on the negative electrode film side becomes a negative electrode film by an electrochemical reaction. The solid electrolyte moves from the surface of the solid electrolyte to the positive electrode film as oxygen ions and is released as oxygen molecules from the surface on the positive electrode film side.

  At this time, a low voltage and large current flows through the solid electrolyte, and self-heat is generated when a large current flows through the solid electrolyte with the applied voltage. Therefore, the metal foil member used is also exposed to a high temperature state in addition to the atmospheric temperature of 600 ° C. The conductive film formed on the surface of the metal foil member improved the current collecting property against a large current and could effectively protect against the surface oxidation of the metal foil. In order to prevent the high-temperature oxidation by forming a conductive film on the surface of the metal foil member, it is necessary to have a width of 3 mm or more in the outer peripheral direction from at least the joint with the positive and negative electrode films. Moreover, since an expensive material is wasted even if the width is too large, it is considered that the width of the conductive film formed on the surface of the metal foil member is practically preferably 3 to 7 mm.

  The vicinity of the surface of the positive electrode film is in a state close to pure oxygen. However, as long as gas leakage cannot be completely prevented, the oxygen is separated from the surface of the positive electrode film and the discharged oxygen is naturally mixed with the leaked gas. Therefore, the metal foil member and the gas sealant 31 which are means for partitioning the space effectively act as means for preventing gas leakage from the negative electrode film side.

  On the other hand, nitrogen is left on the negative electrode film side. The remaining nitrogen diffuses into the atmosphere due to the air permeability of the heat insulating means 39, and new oxygen is supplied from the outside to the negative electrode film side.

  Oxygen gas released from the positive electrode film passes through the vent 42 and constitutes the gas mixing means 43, whereby the gas induction pipe 44, the mixed gas introduction pipe 45, and the gas mixer 46 are mixed with the mixed gas. Mixed. In this embodiment, the mixed gas is the atmosphere. The produced mixed gas is an oxygen-enriched gas, and its flow rate is determined by the suction and discharge speeds of the gas pump 47.

  The oxygen concentration in the mixed gas is determined by the mixed gas flow rate and the amount of oxygen ions flowing through the solid electrolyte, that is, the magnitude of the ionic current. The ionic current can be controlled by the magnitude of the voltage applied to the solid electrolyte.

  Finally, the oxygen concentration in the mixed gas obtained by the oxygen supply device of the present invention is executed by voltage control by the voltage control means 34 and control of the mixed gas flow rate by the gas pump 47.

  As described above, in the present embodiment, four solid electrolytes are electrically connected in a series circuit, and the positive electrode membrane side and the negative electrode membrane side are connected via the solid electrolyte so as to express oxygen ion conductivity. By suppressing gas leakage by partition means in the space, heating and raising temperature and applying voltage, oxygen molecules are released from the positive electrode film, and oxygen-rich mixed gas is generated. By controlling the mixed gas flow rate by the voltage control and the gas pump 47, an arbitrary oxygen concentration gas can be stably obtained.

  In the present embodiment, a glass containing 20 wt% of an alkaline earth metal oxide and 0.5 wt% of an alkali metal oxide is used as the glass ceramic layer in the SiO 2 —B 2 O 3 —MgO—BaO system. The glass ceramic that can be used for this is not limited to this. What is necessary is just to be able to endure rapid thermal strain while keeping the metal foil member in an insulating state. When the alkali metal content is increased, the melting point is lowered, and when the alkaline earth metal content is increased, the crystallization temperature is increased. Therefore, considering the bondability with the metal foil member Fe-20Cr-5Al having high heat resistance, As the glass ceramic layer, a glass containing SiO2—B2O3—MgO—BaO and containing 15 to 25 wt% of an alkaline earth metal oxide and 2 wt% or less of an alkali metal oxide was preferred.

Moreover, it was possible to obtain a good adhesive bondability to the metal foil member by setting the thermal expansion coefficient of the glass ceramic layer to 100 to 120 × 10 ⁻⁷ / ° C.

(Embodiment 2)
FIG. 5 shows a cross-sectional configuration diagram of an oxygen pump element according to the second embodiment of the present invention. Since the schematic configuration is the same as that of the first embodiment, only different parts will be described. The configurations of the electrode film and the conductive film formed on the surfaces of the solid electrolytes 48 and 49 are the same. Here, a configuration in which conductive films 52 and 53 and glass ceramic films 54 and 55 are provided for the metal foil members 50 and 51 connected to the negative electrode film side is used.

  Even when a low voltage and large current flows through the solid electrolyte by the glass ceramic membrane and heat is transferred to the metal foil member side, the metal foil member can be sufficiently protected from the high temperature oxidation state. A glass ceramic material that can be used for such applications is preferably a SiO2-B2O3-MgO-BaO-based material containing 15 to 25 wt% of an alkaline earth metal oxide and 2 wt% or less of an alkali metal oxide. It was good.

  In this embodiment, lanthanum gallate is used as the solid electrolyte. However, the present invention is not limited to this, and yttrium-doped zirconia (YSZ), samarium-doped ceria (SDC), or the like may be used. However, at present, the lanthanum gallate material is the most preferable material in view of the durability of the material because the operating temperature is low as an oxygen ion conductor.

  In the present embodiment, the Fe-20Cr-5Al material is used as the metal foil member. However, the present invention is not limited to this, and other metal foil materials may be used as long as the material has durability against high-temperature oxidation. Can be used. Moreover, although 12 micrometers in thickness was used, it is thought that 5-30 micrometers is preferable as a metal foil member.

  Further, in the present embodiment, as a configuration of the metal foil member, only the case where the solid electrolyte is used as partitioning means for partitioning the space portion by being bonded to the negative electrode film side has been described. It may be used as partition means for partitioning the space portion.

  In this embodiment, Au-based or AgPd-based is used as the conductive film. However, the present invention is not limited to this, and other materials can be used as long as they have a low resistance and heat resistance.

  Moreover, although this Embodiment demonstrated the case where a electrically conductive film was further arrange | positioned to the positive / negative electrode film on the solid electrolyte surface, it can apply also to the structure which does not arrange | position a electrically conductive film.

  As described above, the oxygen pump element according to the present invention and the oxygen supply apparatus having the oxygen pump element can obtain stable and good electric current characteristics over a long period of time, and therefore, air purifiers, air conditioners, or health that use oxygen. Applicable to a wide range of applications such as promotion equipment and health promotion equipment.

Sectional block diagram of the solid electrolyte used as the oxygen pump element in the 1st Embodiment of this invention 1 is a schematic configuration diagram of an oxygen pump element according to a first embodiment of the present invention. Sectional drawing with respect to the A-A 'line of the oxygen pump element in FIG. 1 is a schematic cross-sectional configuration diagram of an oxygen supply device according to a first embodiment of the present invention. Sectional block diagram of the oxygen pump element in the 2nd Embodiment of this invention Plan view of a conventional oxygen pump Cross section of a conventional oxygen pump

Explanation of symbols

7, 12, 13, 14 Solid electrolyte 8 Positive electrode film 9 Negative electrode film 15, 16, 17, 18 Metal foil member 19, 20, 21 Gold foil member 22, 23 Lead part 24 Glass ceramic layer 25, 28 Conductive film 33 Voltage Application means 34 Voltage control means 35 Heating means 37 Temperature control means 38, 39 Heat insulation means 43 Mixing means 54, 55 Glass ceramic membrane

Claims (9)

A plurality of oxygen ion conductive solid electrolytes, an electrode film forming both positive and negative electrodes formed on both surfaces of the oxygen ion conductive solid electrolyte, and the positive electrode side electrode film outer peripheral part or the negative electrode side electrode film outer peripheral part And an oxygen pump, wherein the plurality of oxygen pump elements are configured in a series circuit, and the plurality of metal foil members are connected via a glass ceramic layer. element. The glass ceramic layer is a crystallized glass containing 15 to 25 wt% of an alkaline earth metal oxide and 2 wt% or less of an alkali metal oxide in a SiO2-B2O3-MgO-BaO system. The oxygen pump element according to claim 1. 3. The oxygen pump element according to claim 1, wherein the glass ceramic layer has a thermal expansion coefficient of 100 to 120 × 10 ⁻⁷ / ° C. 3. 4. The metal foil member joined to the positive electrode side or the negative electrode side outer peripheral part is configured as a partitioning means for partitioning a space part in contact with the solid electrolyte. The oxygen pump element described. The oxygen pump element according to claim 1, wherein the solid electrolyte is lanthanum gallate. The metal foil member having a connection structure with the electrode film is characterized in that a conductive film layer is formed at a joint portion and a conductive film communicating with the conductive film layer is formed at a predetermined width on both side surface portions. The oxygen pump element according to any one of 1 to 5. The metal foil member having a connection structure with the electrode film has a conductive film layer formed at a joint portion, a conductive film communicating with the conductive film layer is formed at a predetermined width on one surface portion, and a glass ceramic is formed on the other surface portion. 6. The oxygen pump element according to claim 1, wherein the film has a predetermined width. 8. The oxygen pump element according to claim 6, wherein the width of the conductive film or the width of the glass ceramic film is 3 to 7 mm. The oxygen pump element according to any one of claims 1 to 8, a voltage application means for applying a voltage to the oxygen pump element connected in a series circuit, a voltage control means for controlling the voltage application means, and Heating means for heating the oxygen pump element, temperature control means for detecting the temperature of the oxygen pump element and controlling the heating means, and breathable heat insulating means for preventing thermal diffusion of the heating means and the oxygen pump element And an oxygen supply device comprising: mixing means for mixing oxygen generated through the oxygen pump element with air to form a mixed gas having a predetermined oxygen concentration.

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