JP4904568B2 - Single-chamber solid electrolyte fuel cell and method for manufacturing the same - Google Patents

Description

【００２４】
表１に示すように、Ｐｄ添加量が１〜１０質量％の範囲で、１２００Ｗ／ｍ²以上の高い発電性能を得ることができた。また、３〜７質量％の範囲では１４００Ｗ／ｍ²以上、５〜７質量％の範囲では１５８０Ｗ／ｍ²以上の特に高い発電性能を得ることができた。
更に、パラジウムに限らず白金、ロジウム、イリジウム及びルテニウムを添加しても同様の結果が得ることができる。
【００２５】
（３）酸素イオン伝導性固体電解質の厚みの検討
酸素イオン伝導性固体電解質の厚さを様々に変化させた単室型固体電解質型燃料電池における出力特性を求め、その結果を図３に示す。
酸素イオン伝導性固体電解質の厚さは、０．５×１０^-3ｍ、０．２５×１０^-3ｍ、及び０．１５×１０^-3ｍについて検討を行った。「（１）酸素イオン伝導性固体電解質材料の検討」と同様の条件にて測定を行った。また、各電極２、３は、直径９×１０^-3ｍ（面積０．６４×１０^-4ｍ²）とした。更に、パラジウムを７質量％添加した負極とした。
【００２６】
図２に示すように、酸素イオン伝導性固体電解質の厚さが０．１５×１０^-3ｍで５０００Ｗ／ｍ²以上という、最も高い出力密度が得られた。また、０．１５×１０^-3ｍ未満という薄い酸素イオン伝導性固体電解質では、発電実験時に電解質の破損が発生した。更に、０．５×１０^-3ｍより厚い酸素イオン伝導性固体電解質では、２０００Ｗ／ｍ²未満と、出力が大幅に低下することがわかった。
【００２７】
（４）動作温度と混合ガス組成の検討
単室型固体電解質型燃料電池の動作温度、及び混合ガス組成についての検討を行った。酸素イオン伝導性固体電解質の厚さを０．１５×１０^-3ｍとし、温度が５５０℃、５００℃及び４５０℃、混合ガス組成がメタン：酸素比＝１：２又は２：１の動作環境下で単室型固体電解質型燃料電池の出力特性を行った。この結果を表２に示す。
「（１）酸素イオン伝導性固体電解質材料の検討」と同様の条件にて測定を行った。また、各電極２、３は、直径９×１０^-3ｍ（面積０．６４×１０^-4ｍ²）とした。更に、パラジウムを７質量％添加した負極とした。
【００２８】
【表２】

【００２９】
表２に示すように、実験温度が４５０℃〜５５０℃という低温であっても２６５０Ｗ／ｍ²以上の出力が得られ、メタンを燃料に用いて発電可能であることがわかた。また、混合ガス組成比を１に変化させると、５５０℃では６４４０Ｗ／ｍ²と、更に高出力が得られることがわかった。
【００３０】
【発明の効果】
本発明の単室型固体電解質型燃料電池によれば、６００℃以下の温度域でもメタンと酸素の混合ガス中で安定した電流を得ることができる。このため、電池本体及び周辺部材の長寿命化と低コスト化等が容易であり、高信頼性の燃料電池を容易に実用化することができる。また、酸素イオン伝導性固体電解質の材質を適宜選択し、厚さを所定の範囲とすることで、６００℃以下の温度域でも高い出力を備えたものとすることができる。
【図面の簡単な説明】
【図１】 本単室型固体電解質型燃料電池の説明をするための模式図である。
【図２】 酸素イオン伝導性固体電解質の材質による本単室型固体電解質型燃料電池の出力変化を説明するためのグラフである。
【図３】 酸素イオン伝導性固体電解質の厚さによる本単室型固体電解質型燃料電池の出力変化を説明するためのグラフである。
【符号の説明】
１；酸素イオン伝導性固体電解質、２；正極、３；負極、４；アルミナ管。[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a single-chamber solid oxide fuel cell and a method for manufacturing the same, which do not require the use of gas seal materials and separator materials that have been required so far, because the single-chamber type and the device structure are simple. . More specifically, the present invention relates to a single-chamber solid electrolyte fuel cell that can output a stable large current even at a lower temperature than conventional ones, and a method for manufacturing the same.
[0002]
[Prior art]
A conventional solid oxide fuel cell could not generate electric power unless it was a two-chamber type system in which a fuel gas such as hydrogen or methane was separately supplied to a nickel-zirconia cermet negative electrode and air was separately supplied to a manganese lanthanum positive electrode. For this reason, not only the apparatus becomes complicated by requiring a gas seal material and a separator material, but also a deterioration occurs due to a solid phase reaction between these, a zirconia electrolyte, a positive electrode, and a negative electrode, resulting in a short battery life.
[0003]
In order to solve this drawback, a single-chamber type solid oxide fuel cell that can mix fuel gas and air in advance and generate power in this gas has been developed. An impractical electrode member such as palladium, platinum, or gold had to be used (see Japanese Patent No. 2810977).
[0004]
Furthermore, the power generation start temperature of the single-chamber solid electrolyte fuel cell can shorten the time until start-up, and has the merit that thermal stress and repeated deterioration can be reduced when start-up and stop are repeated. Therefore, the lower one is preferable. In addition, since methane is a main component of general city gas, it is easily available and suitable as a gas raw material for a single-chamber solid electrolyte fuel cell.
[0005]
For this reason, in recent years, research into operating a single-chamber solid electrolyte fuel cell at a relatively low temperature of 700 ° C. or less has become active. For example, the single-chamber solid electrolyte fuel cell proposed by the present inventors in the Journal of The Electrochemical Society, 147 (8) 2888-2892 (2000) is La _0.9 Sr _0.1 Ga _0.8 Mg _0.2 O _2.85 (hereinafter, LSGM) or Ce _0.8 Sm _0.2 O _1.9 (hereinafter referred to as SDC) as an electrolyte, and Ni-SDC and Sm _0.8 Sr _0.5 CoO _{3 ± δ} as electrodes. It was shown that a stable current output can be obtained in a gas in which hydrocarbon and oxygen are mixed.
[0006]
[Problems to be solved by the invention]
However, the conventional single-chamber solid electrolyte fuel cell has a problem in that it cannot be used because almost no output is obtained even if it is operated at 600 ° C. or lower using methane as a fuel.
The present invention solves such problems, and a single-chamber solid electrolyte fuel cell capable of stably obtaining a large current in a mixed gas of methane and oxygen even when operated at 600 ° C. or lower. And it aims at providing the manufacturing method.
[0007]
[Means for Solving the Problems]
The single-chamber solid electrolyte fuel cell of the present invention has a single chamber in which a negative electrode is provided on one side of an oxygen ion conductive solid electrolyte and a positive electrode is provided on the other side of the oxygen ion conductive solid electrolyte. Type single-chamber solid oxide fuel cell having a type cell structure and capable of generating electric power by introducing a mixed gas of lower hydrocarbon and air, the positive electrode comprising Ln _1-x Sr _x CoO _{3 ± δ} (Where Ln is a rare earth element, 0.2 ≦ x ≦ 0.8, δ is an amount of oxygen deficiency, etc., and 0 ≦ δ <1), and the negative electrode is mainly composed of nickel and cerium oxide. A double oxide, and at least one selected from palladium, platinum, rhodium, iridium and ruthenium ,
The content ratio of at least one selected from palladium, platinum, rhodium, iridium and ruthenium in the negative electrode is 1 to 10% by mass .
[0008]
The method for producing a single-chamber solid electrolyte fuel cell of the present invention comprises a single chamber in which a negative electrode is provided on one side of an oxygen ion conductive solid electrolyte and a positive electrode is provided on the other side of the oxygen ion conductive solid electrolyte. Of a single-chamber solid oxide fuel cell having a type cell structure and capable of generating power by introducing a mixed gas of lower hydrocarbon and air, the method for producing a single-chamber solid oxide fuel cell The method includes nickel oxide powder, double oxide powder mainly composed of cerium oxide, and at least one selected from palladium, platinum, rhodium, iridium and ruthenium, and at least selected from the palladium, platinum, rhodium, iridium and ruthenium. content in one of the negative electrode were mixed and pulverized in an organic solvent such that 1 to 10 wt% of the paste-like negative electrode material was prepared, the oxygen ions this Baked on one surface of the conductive solid electrolyte to form a cathode, then, _{Ln 1-x} Sr doped with strontium x CoO _{3 ±} δ _(although, Ln is a rare earth element, 0.2 ≦ x ≦ 0.8, δ is the amount of oxygen deficiency, etc., and 0 ≦ δ <1) is mixed and ground in an organic solvent to prepare a paste-like positive electrode material, which is applied to the other surface of the oxygen ion conductive solid electrolyte. The positive electrode is formed by baking.
[0009]
The electrode material composed of Ln _1-x Sr _x CoO _{3 ± δ as the} positive electrode can be arbitrarily selected for the rare earth element represented by Ln, but is preferably lanthanum (La) or samarium (Sm). Further, the doping amount x of strontium is particularly preferably x = 0.4 when Ln is La and x = 0.5 when Sm.
The negative electrode of the present single-chamber solid electrolyte fuel cell only needs to contain nickel and a double oxide mainly composed of cerium oxide. As a double oxide mainly composed of cerium oxide, Ce _1-y Ln _y O _{2− δ} (Ln is Sm, Gd or Y, 0.1 ≦ y ≦ 0.3, δ is the amount of oxygen deficiency, 0 ≦ δ <1, more specifically Ce _0.8 Sm _0.2 O _1.9 ).
[0010]
The oxygen ion conductive solid electrolyte used in the present invention is generally a solid electrolyte exhibiting high oxygen ion conductivity such as stabilized zirconia, but in order to obtain high power generation performance, high oxygen ions are used even at low temperatures. A solid electrolyte exhibiting conductivity is preferred. Therefore, the oxygen ion conductive solid electrolyte is preferably cerium oxide doped with a rare earth element, or lanthanum gallium oxide doped with Sr at the La site and doped with Mg at the Ga site.
[0011]
Further, the oxygen ion conductive solid electrolyte is Ce _1-y Ln _y O _2-δ (Ln is Sm, Gd or Y, 0.1 ≦ y ≦ 0.3, δ is the amount of oxygen deficiency, and 0 ≦ δ <1) or La _1−z Sr _z Ga _1−w Mg _w O _3−δ (0.1 ≦ w ≦ 0.3, 0.1 ≦ z ≦ 0.3, where δ is the amount of oxygen deficiency. And 0 ≦ δ <1). Specific examples thereof include Ce _0.8 Sm _0.2 O _1.9 (hereinafter referred to as SDC) or La _0.9 Sr _0.1 Ga _0.8 Mg _0.2 O _2.85 (hereinafter referred to as LSGM). ).
The content ratio of at least one selected from palladium, platinum, rhodium, iridium and ruthenium in the negative electrode is 1 to 10% by mass (preferably 3 to 7% by mass, particularly preferably 5 to 7% by mass) . . This is because the content ratio in this range affects the catalytic action of the negative electrode, which is a nickel-based electrode, and high power generation performance is obtained.
[0012]
The thickness of the oxygen ion conductive solid electrolyte may be 0.15 × 10 ^{−3 to} 0.50 × 10 ⁻³ m.
The thickness of the solid electrolyte greatly affects the internal resistance value of the single-chamber solid electrolyte fuel cell, and the lower the internal resistance, the higher the power generation performance. However, the strength of the electrolyte is reduced by reducing the thickness. For this reason, by setting the thickness of the oxygen ion conductive solid electrolyte within the above range, it is possible to achieve both high power generation performance and necessary mechanical strength.
[0013]
[Action]
In the single-chamber solid electrolyte fuel cell of the present invention, as shown in FIG. 1, an electrode containing a double oxide mainly composed of nickel and cerium oxide is arranged on one side of an oxygen ion conductive solid electrolyte, and the other side The fuel cell has a structure in which an electrode made of Ln _1-x Sr _x CoO _{3 ± δ} doped with strontium is arranged, and can stably generate power in a mixed gas of hydrocarbon and air.
In such a battery system, the lower the power generation start temperature, the shorter the time until start-up, and there are advantages such as the ability to reduce the thermal stress when starting and stopping repeatedly, as shown in the prior art In the temperature range of 600 ° C. or lower, almost no output was obtained unless the hydrocarbon had 2 or more carbon atoms such as ethane or propane.
[0014]
This is because methane, which is more stable than ethane, is considered to have a partial oxidation reaction (for example, 2CH ₄ + O ₂ → 2H ₂ + 2CO) on the negative electrode, which is a nickel-based electrode, at low temperatures. The present invention has been completed by providing an electrode that facilitates the oxidation reaction. That is, an electrode containing nickel, a double oxide mainly composed of cerium oxide, and at least one selected from palladium, platinum, rhodium, iridium, and ruthenium is an electrode in which the partial oxidation reaction easily proceeds. A stable output could be obtained even at 600 ° C. or lower. These added components are considered to act as a kind of catalyst.
[0015]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, the single-chamber solid electrolyte fuel cell of the present invention will be described in more detail with reference to FIGS.
1. Configuration of Single Chamber Solid Electrolyte Fuel Cell As shown in FIG. 1, the single chamber solid electrolyte fuel cell of the present invention has a positive electrode 2 and a negative electrode on each surface of a disk-shaped oxygen ion conductive solid electrolyte 1 respectively. 3. The single-chamber solid electrolyte fuel cell is housed in an alumina tube 4 and used in a state where a mixed gas of methane and air is circulated through the alumina tube 4.
[0016]
Oxygen ion conductive solid electrolyte 1 is _{La 1-z Sr z Ga 1} -w Mg w O 3- δ and _{Ce 1-y Ln y O 2-} δ or the like can be used, in the present embodiment LSGM, SDC or YSZ was used. The positive electrode 2 is an electrode that becomes strontium-doped Ln _1-x Sr _x CoO _{3 ± δ} (Ln: rare earth element, particularly La or Sm), and Sm _0.5 Sr _0.5 CoO _{3 ± δ} is used. Furthermore, the negative electrode 3 are nickel and mixtures _{(Ce 1-y Sm y O} 2- δ) and the electrode with the addition of palladium 1% by weight in the cerium oxide doped with samarium. SDC (Ce _0.8 Sm _0.2 O _1.9 ) was used as the mixture of samarium-doped cerium oxide. The mixing ratio of Ni and SDC was 7: 3 by weight.
[0017]
2. Production of single-chamber solid electrolyte fuel cell This single-chamber solid electrolyte fuel cell was produced as follows.
First, the negative electrode 3 is formed on one surface of the oxygen ion conductive solid electrolyte 1. A predetermined amount of nickel oxide powder and SDC powder are weighed, mixed and pulverized using an appropriate organic solvent, and then a predetermined amount of palladium oxide powder is added and mixed and pulverized to prepare a paste-like electrode material. This was screen-printed on the oxygen ion conductive solid electrolyte 1 and baked at 1400 ° C.
[0018]
Next, the positive electrode 2 is formed on the opposite side of the surface on which the negative electrode 3 of the oxygen ion conductive solid electrolyte 1 is formed. Sm _0.5 Sr _0.5 CoO _{3 ± δ} is dissolved in an organic solvent and pulverized to prepare a paste-like electrode material. This was screen-printed on the surface opposite to the negative electrode 3 of the oxygen ion conductive solid electrolyte 1, and baked at 900 ° C.
[0019]
Further, the reduction treatment may be performed as necessary, or the reduction treatment can be used. When performing the reduction treatment, H ₂ gas is introduced into the oxygen ion conductive solid electrolyte 1 on which the electrodes 2 and 3 are formed at a temperature of 450 to 550 ° C. to reduce the nickel oxide and palladium oxide of the negative electrode 3. . Even when no reduction treatment is performed, the flowing mixed gas causes a reaction of CH ₄ + 1 / 2O ₂ → 2H ₂ + CO, and a reduction atmosphere is generated, and reduction of nickel oxide and palladium oxide occurs to obtain output. Will be able to.
The single-chamber solid electrolyte fuel cell produced in this way can obtain power output from the positive and negative electrodes by introducing a mixed gas of methane and oxygen.
[0020]
3. Evaluation of single-chamber solid electrolyte fuel cell (1) Examination of oxygen ion conductive solid electrolyte material The output characteristics of the oxygen ion conductive solid electrolyte material will be examined below. The oxygen ion conductive solid electrolyte 1 examined is zirconia (hereinafter referred to as YSZ), LSGM, and SDC stabilized with 8 mol% Y ₂ O ₃ . These oxygen ion conductive solid electrolytes were densely sintered by an existing sintering method so as to be a disk-shaped ceramic having a diameter of 12 × 10 ⁻³ m and a thickness of 0.5 × 10 ⁻³ m. The electrode has a diameter of 8 × 10 ⁻³ m and an area of 0.5 × 10 ⁻⁴ m ^{2. The} positive electrode and the negative electrode are made of Sm _0.5 Sr _0.5 CoO _{3 ± δ} , Ni-SDC (7 : 3).
By supplying a mixed gas of methane: oxygen = 2: 1 to such a single-chamber solid electrolyte fuel cell and applying various loads at 550 ° C., a graph of output voltage and output current shown in FIG. Asked.
[0021]
As shown in FIG. 2, the single-chamber solid electrolyte fuel cell, the output of the maximum in the YSZ about 100W / m ^2, up to the LSGM about 980W / m ^2, up to the SDC to about 1200 W / m ² was obtained . Thus, it was found that even when YSZ was used for the oxygen ion conductive solid electrolyte 1, a necessary output was obtained in a temperature range of 600 ° C. or lower. Moreover, by using LSGM and SDC having high ion conductivity, a large output could be stably obtained in a temperature range of 600 ° C. or lower.
[0022]
(2) Examination of addition amount of palladium Table 1 shows the results of obtaining the open circuit voltage and the maximum output density in the single-chamber solid electrolyte fuel cell in which the addition amount of palladium in the negative electrode was variously changed. The single-chamber solid electrolyte fuel cell used used SDC as the oxygen ion conductive solid electrolyte 1 and measured under the same conditions as in “(1) Examination of oxygen ion conductive solid electrolyte material”.
[0023]
[Table 1]

[0024]
As shown in Table 1, high power generation performance of 1200 W / m ² or more could be obtained when the amount of Pd added was in the range of 1 to 10% by mass. Further, in the range of 3 to 7 wt% 1400W / m ² or more, in the range of 5 to 7 wt% could be obtained 1580W / m ² or more, especially high power generation performance.
Further, not only palladium but also platinum, rhodium, iridium and ruthenium can be added to obtain the same result.
[0025]
(3) Examination of Thickness of Oxygen Ion Conductive Solid Electrolyte Output characteristics in a single chamber type solid electrolyte fuel cell in which the thickness of the oxygen ion conductive solid electrolyte was changed in various ways were obtained, and the results are shown in FIG.
The thickness of the oxygen ion conductive solid electrolyte was examined for 0.5 × 10 ⁻³ m, 0.25 × 10 ⁻³ m, and 0.15 × 10 ⁻³ m. The measurement was performed under the same conditions as in “(1) Examination of oxygen ion conductive solid electrolyte material”. The electrodes 2 and 3 have a diameter of 9 × 10 ⁻³ m (area 0.64 × 10 ⁻⁴ m ² ). Furthermore, it was set as the negative electrode which added 7 mass% of palladium.
[0026]
As shown in FIG. 2, the highest power density of 5000 W / m ² or more when the thickness of the oxygen ion conductive solid electrolyte was 0.15 × 10 ⁻³ m was obtained. Further, in the thin oxygen ion conductive solid electrolyte of less than 0.15 × 10 ⁻³ m, the electrolyte was damaged during the power generation experiment. Furthermore, it was found that the output of the oxygen ion conductive solid electrolyte thicker than 0.5 × 10 ⁻³ m is greatly reduced to less than 2000 W / m ² .
[0027]
(4) Examination of operating temperature and mixed gas composition The operating temperature and mixed gas composition of the single-chamber solid electrolyte fuel cell were examined. The operating environment in which the thickness of the oxygen ion conductive solid electrolyte is 0.15 × 10 ⁻³ m, the temperatures are 550 ° C., 500 ° C. and 450 ° C., and the mixed gas composition is methane: oxygen ratio = 1: 2 or 2: 1. Below, the output characteristics of a single-chamber solid electrolyte fuel cell were performed. The results are shown in Table 2.
The measurement was performed under the same conditions as in “(1) Examination of oxygen ion conductive solid electrolyte material”. The electrodes 2 and 3 have a diameter of 9 × 10 ⁻³ m (area 0.64 × 10 ⁻⁴ m ² ). Furthermore, it was set as the negative electrode which added 7 mass% of palladium.
[0028]
[Table 2]

[0029]
As shown in Table 2, it was found that an output of 2650 W / m ² or more was obtained even when the experimental temperature was as low as 450 ° C. to 550 ° C., and it was possible to generate electricity using methane as the fuel. It was also found that when the mixed gas composition ratio was changed to 1, a higher output of 6440 W / m ² was obtained at 550 ° C.
[0030]
【Effect of the invention】
According to the single-chamber solid electrolyte fuel cell of the present invention, a stable current can be obtained in a mixed gas of methane and oxygen even in a temperature range of 600 ° C. or lower. For this reason, it is easy to extend the life and cost of the battery main body and peripheral members, and a highly reliable fuel cell can be easily put into practical use. Further, by appropriately selecting the material of the oxygen ion conductive solid electrolyte and setting the thickness within a predetermined range, a high output can be provided even in a temperature range of 600 ° C. or lower.
[Brief description of the drawings]
FIG. 1 is a schematic view for explaining the single-chamber solid electrolyte fuel cell.
FIG. 2 is a graph for explaining an output change of the single-chamber solid electrolyte fuel cell according to the material of the oxygen ion conductive solid electrolyte.
FIG. 3 is a graph for explaining a change in output of the single-chamber solid electrolyte fuel cell according to the thickness of the oxygen ion conductive solid electrolyte.
[Explanation of symbols]
1; oxygen ion conductive solid electrolyte, 2; positive electrode, 3; negative electrode, 4; alumina tube.

Claims (5)

A single-chamber cell structure in which a negative electrode is provided on one side of an oxygen ion conductive solid electrolyte and a positive electrode is provided on the other side of the oxygen ion conductive solid electrolyte in a single chamber, and a mixture of lower hydrocarbons and air A single-chamber solid oxide fuel cell capable of generating power by introducing gas,
The positive electrode is made of Ln _1-x Sr _x CoO _{3 ± δ} (where Ln is a rare earth element, 0.2 ≦ x ≦ 0.8, 0 ≦ δ <1),
The negative electrode contains nickel, a double oxide mainly composed of cerium oxide, and at least one selected from palladium, platinum, rhodium, iridium and ruthenium ,
The single-chamber solid electrolyte fuel cell characterized in that the content ratio of at least one selected from palladium, platinum, rhodium, iridium and ruthenium in the negative electrode is 1 to 10% by mass .   2. The single-chamber solid electrolyte according to claim 1, wherein the oxygen ion conductive solid electrolyte is cerium oxide doped with a rare earth element, or lanthanum gallium oxide in which La site is doped with Sr and Ga site is doped with Mg. Type fuel cell. The oxygen ion conductive solid electrolyte is Ce _1-y Ln _y O _2-δ (Ln is Sm, Gd or Y, 0.1 ≦ y ≦ 0.3, 0 ≦ δ <1) or La _1-z Sr. _{z Ga 1-w Mg w O} 3-δ (0.1 ≦ w ≦ 0.3,0.1 ≦ z ≦ 0.3,0 ≦ δ <1) single-chamber solid according to claim 2, wherein Electrolytic fuel cell. Single-chamber solid electrolyte according to any one of claims 1 to 3 the thickness of the oxygen-ion conductive solid electrolyte is ^{0.15 × 10 -3 ~0.50 × 10 -3} m Fuel cell. It has a single-chamber battery structure in which a negative electrode is provided on one side of the oxygen ion conductive solid electrolyte and a positive electrode is provided on the other side of the oxygen ion conductive solid electrolyte. A mixed gas of lower hydrocarbon and air is introduced. A method for producing a single-chamber solid oxide fuel cell capable of generating electricity by
Nickel oxide powder, double oxide powder mainly composed of cerium oxide, and at least one selected from palladium, platinum, rhodium, iridium and ruthenium, and at least one negative electrode selected from palladium, platinum, rhodium, iridium and ruthenium A paste-like negative electrode material is prepared by mixing and pulverizing in an organic solvent so that the content in the mixture becomes 1 to 10% by weight , and this is baked on one surface of the oxygen ion conductive solid electrolyte to form a negative electrode Next, Ln _1-x Sr _x CoO _{3 ± δ} (where Ln is a rare earth element, 0.2 ≦ x ≦ 0.8, 0 ≦ δ <1) is mixed and pulverized in an organic solvent to form a paste A single-chamber solid oxide fuel cell characterized in that a positive electrode material is prepared and baked on the other surface of the oxygen ion conductive solid electrolyte to form a positive electrode. The method of production.

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