JP2008041305A - Method for operating solid electrolyte fuel cell - Google Patents
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Abstract
Description
この発明は、出力性能を一層向上させることができる固体電解質形燃料電池の運転方法に関するものである。 The present invention relates to a method for operating a solid oxide fuel cell capable of further improving output performance.
固体電解質形燃料電池は、酸化物からなる固体電解質の片面に空気極を積層し、固体電解質のもう一方の片面に燃料極を積層してなる構造を有している発電セルと、この発電セルの空気極の外側に空気極集電体を積層させ、一方、発電セルの燃料極の外側に燃料極集電体を積層させ、前記空気極集電体の外側に空気極集電体側セパレータを積層させ、前記燃料極集電体の外側に燃料極集電体側セパレータを積層させた基本構造を有している。なお、セパレータが集電体の機能を併せ持つ場合は、空気極側および／または燃料極側の集電体を有しない場合がある。
かかる基本構造を有する固体電解質形燃料電池は、酸化剤ガス（空気または酸素）を空気極集電体側セパレータに接続して設けられたパイプなどからなる空気供給通路を通して空気極集電体に供給し、同時に、燃料ガス（水素、炭化水素、一酸化炭素など）を燃料極集電体側セパレータに接続して設けられたパイプなどからなる燃料供給通路を通して燃料集電体に供給して運転する。
A solid electrolyte fuel cell includes a power generation cell having a structure in which an air electrode is stacked on one side of a solid electrolyte made of an oxide and a fuel electrode is stacked on the other side of the solid electrolyte, and the power generation cell An air electrode current collector is laminated outside the air electrode current collector, while a fuel electrode current collector is laminated outside the fuel electrode of the power generation cell, and an air electrode current collector side separator is arranged outside the air electrode current collector. It has a basic structure in which a fuel electrode current collector separator is stacked on the outside of the fuel electrode current collector. When the separator also has the function of a current collector, the separator may not have a current collector on the air electrode side and / or the fuel electrode side.
A solid oxide fuel cell having such a basic structure supplies an oxidant gas (air or oxygen) to an air electrode current collector through an air supply passage formed of a pipe or the like provided by connecting to an air electrode current collector side separator. At the same time, fuel gas (hydrogen, hydrocarbon, carbon monoxide, etc.) is supplied to the fuel current collector through a fuel supply passage including a pipe connected to the anode current collector separator.
前記固体電解質形燃料電池の発電セルを構成する固体電解質として、ランタンガレート系酸化物イオン伝導体を用いることが知られており、このランタンガレート系酸化物イオン伝導体は、一般式：Ｌａ1-X ＳｒX Ｇａ1-Y-Z ＭｇY ＡZ Ｏ3（式中、Ａ＝Ｃｏ、Ｆｅ、Ｎｉ、Ｃｕの１種または2種以上、Ｘ＝０．０５〜０．３、Ｙ＝０〜０．２９、Ｚ＝０．０１〜０．３、Ｙ＋Ｚ＝０．０２５〜０．３）で表される酸化物イオン伝導体であることが知られている（特許文献１参照）。 It is known that a lanthanum gallate-based oxide ion conductor is used as a solid electrolyte constituting a power generation cell of the solid electrolyte fuel cell. The lanthanum gallate-based oxide ion conductor has a general formula: La 1− X Sr X Ga 1-YZ Mg Y a Z O 3 ( where, a = Co, Fe, Ni , Cu 1 or more kinds of, X = 0.05~0.3, Y = 0~0 . 29, Z = 0.01 to 0.3, Y + Z = 0.025 to 0.3) is known (see Patent Document 1).
また、前記燃料極は、一般式：Ｃｅ1-mＢmＯ2、（式中、ＢはＳｍ、Ｌａ、Ｇｄ、Ｙ、Ｃａの１種または２種以上、ｍは０＜ｍ≦０．４）で表されるＢ（ただし、ＢはＳｍ、Ｌａ、Ｇｄ、Ｙ、Ｃａの１種または２種以上を示す。以下、同じ）ドープされたセリア粒とニッケル粒とで構成された多孔質焼結体からなることが知られており、この多孔質焼結体はニッケル粒が相互に焼結して骨格構造を形成し、その骨格構造を有する多孔質ニッケルの表面に０．１〜２μｍの粒径を有するＢドープされたセリア粒がネットワーク構造を形成して付着した構造を有していることも知られている。
さらに、空気極はコバルタイト化合物［例えば、（Ｂａ、Ｌａ）ＣｏＯ3、（Ｓｍ、Ｓｒ）ＣｏＯ3など］や酸化マンガン化合物［例えば、（Ｌａ、Ｓｒ）ＭｎＯ3など］のセラミックスで構成されている（特許文献２参照）。
The fuel electrode has a general formula: Ce 1-m B m O 2 , wherein B is one or more of Sm, La, Gd, Y, and Ca, and m is 0 <m ≦ 0. 4) B represented by B (where B represents one or more of Sm, La, Gd, Y, and Ca. The same applies hereinafter) Porous material composed of doped ceria grains and nickel grains This porous sintered body is known to be composed of a sintered body, and nickel particles are sintered together to form a skeleton structure, and the surface of the porous nickel having the skeleton structure has a thickness of 0.1 to 2 μm. It is also known that B-doped ceria grains having a grain size of 1 have a structure in which a network structure is formed and adhered.
Further, the air electrode is made of a ceramic of a cobaltite compound [eg (Ba, La) CoO 3 , (Sm, Sr) CoO 3 etc.] or a manganese oxide compound [eg (La, Sr) MnO 3 etc.]. (See Patent Document 2).
一方、燃料極集電体は一般に、Ｎｉメッシュ、白金メッシュなどで構成されている。さらに空気極集電体は、一般に、Ｎｉメッシュ、白金メッシュで構成されていることが知られているが、近年、高価な白金メッシュに代えて安価な銀メッシュ、銀フェルト、発泡銀などの銀多孔質体、さらに銀以外の金属からなるメッシュ、フェルト、発泡金属の表面を銀で被覆した銀被覆多孔質金属体などが使用されるようになっている（特許文献３参照）。 On the other hand, the anode current collector is generally composed of Ni mesh, platinum mesh or the like. Furthermore, it is known that the air electrode current collector is generally composed of Ni mesh or platinum mesh, but in recent years, instead of expensive platinum mesh, inexpensive silver mesh, silver felt, silver such as foamed silver, etc. A porous body, a mesh made of a metal other than silver, a felt, a silver-coated porous metal body in which the surface of a foam metal is covered with silver, and the like are used (see Patent Document 3).
さらに、前記固体電解質形燃料電池の空気極集電体側セパレータおよび燃料極集電体側セパレータは、通常、高温耐食性に優れたステンレス鋼で構成されているが、空気極集電体側セパレータの表面は特に酸化され易く、空気極集電体側セパレータの表面が酸化されて空気極集電体との接触抵抗が大きくなって起電力が大きく消耗し、それによって発電効率が大きく低下するところから、一般に、空気極集電体側セパレータの表面には銀メッキ層が形成されるようになってきた（特許文献４参照）。 Furthermore, the air electrode current collector side separator and the fuel electrode current collector side separator of the solid electrolyte fuel cell are usually made of stainless steel having excellent high temperature corrosion resistance, but the surface of the air electrode current collector side separator is particularly In general, the air electrode current collector side separator is oxidized, the contact resistance with the air electrode current collector is increased, the electromotive force is consumed greatly, and the power generation efficiency is greatly reduced. A silver plating layer has come to be formed on the surface of the pole current collector separator (see Patent Document 4).
かかる構成を有する固体電解質形燃料電池は、通常、温度：約６００〜８００℃の範囲内で運転され、長期間にわたって発電セルの発電性能を低下させることなく安定した発電を行なう必要がある。かかる長期間にわたって安定した発電を行なう方法の一つとして、約８００〜１０００℃の範囲内で運転される固体電解質形燃料電池について燃料極集電体に供給する酸化剤ガス（空気または酸素）に含まれる水分を除去し、この予め水分を除去した酸化剤ガスを燃料極集電体に供給することにより長期間にわたって安定した発電を行なう固体電解質形燃料電池の運転方法が提案されている（特許文献５参照）。
確かに、水分を除去した酸化剤ガスを空気極集電体に供給し、固体電解質形燃料電池を温度：８００〜１０００℃で運転すると、長期間性能を低下させることなく運転させることができるが、近年、固体電解質形燃料電池の運転温度を低くして安価な材料を使用し、それによってコストを低減したり、または固体電解質形燃料電池の使用寿命を長く保つために温度：８００℃以下の低温で運転しようとしている。しかし、運転温度を８００℃以下の低温になると出力性能が低下するので好ましくない。 Certainly, when the oxidant gas from which moisture is removed is supplied to the air electrode current collector and the solid electrolyte fuel cell is operated at a temperature of 800 to 1000 ° C., it can be operated without degrading performance for a long time. Recently, in order to reduce the operating temperature of the solid oxide fuel cell and to use an inexpensive material, thereby reducing the cost or keeping the service life of the solid oxide fuel cell long, the temperature: 800 ° C. or less Trying to drive at low temperatures. However, when the operating temperature is a low temperature of 800 ° C. or lower, the output performance is lowered, which is not preferable.
そこで、本発明者等は、上述のような観点から、温度：８００℃以下の低温でも高出力性能を出すことができる固体電解質形燃料電池の運転方法を開発すべく研究を行った。
その結果、固体電解質形燃料電池の空気極に供給する酸化剤ガス（空気または酸素）に水分を０．５〜１０体積％含ませると、固体電解質形燃料電池の発電セルにおける空気極の過電圧を低減させることができ、そのために発電電圧の低下を少なくすることができて固体電解質形燃料電池の高出力性能を維持しながら運転することができ、特に、発電セルにおける空気極がコバルタイト化合物で構成されている発電セルを有する固体電解質形燃料電池に効果がある、などという研究結果が得られたのである。
In view of the above, the present inventors conducted research to develop a method for operating a solid oxide fuel cell that can achieve high output performance even at a low temperature of 800 ° C. or lower.
As a result, if the oxidant gas (air or oxygen) supplied to the air electrode of the solid oxide fuel cell contains water in an amount of 0.5 to 10% by volume, the overvoltage of the air electrode in the power generation cell of the solid oxide fuel cell is reduced. Therefore, the decrease in generated voltage can be reduced and the high output performance of the solid oxide fuel cell can be maintained, and in particular, the air electrode in the power generation cell is composed of cobaltite compound. Research results have been obtained, such as being effective for solid electrolyte fuel cells having power generation cells.
この発明は、かかる研究結果に基づいてなされたものであって、
（１）固体電解質形燃料電池の空気極に、水：０．５〜１０体積％含有する酸化剤ガスを供給する固体酸化物形燃料電池の運転方法、
（２）前記固体酸化物形燃料電池は、温度：３００〜８００℃で運転する前記（１）記載の固体酸化物形燃料電池の運転方法、に特徴を有するものである。
The present invention has been made based on the results of such research,
(1) A method for operating a solid oxide fuel cell in which an oxidant gas containing 0.5 to 10% by volume of water is supplied to the air electrode of the solid electrolyte fuel cell,
(2) The solid oxide fuel cell is characterized by the operation method of the solid oxide fuel cell according to (1), which is operated at a temperature of 300 to 800 ° C.
前記（１）または（２）記載の固体酸化物形燃料電池の運転方法は、セラミックからなる空気極のうちでも、特にコバルタイト化合物［例えば、（Ｂａ、Ｌａ）ＣｏＯ3、（Ｓｍ、Ｓｒ）ＣｏＯ3など］を含むセラミックスで構成されている固体酸化物形燃料電池に対して有効である。したがって、この発明は、
（３）前記固体酸化物形燃料電池は、コバルタイト化合物を含む空気極を有する固体酸化物形燃料電池である前記（１）または（２）記載の固体酸化物形燃料電池の運転方法、
（４）前記コバルタイト化合物は、（Ｂａ、Ｌａ）ＣｏＯ3または（Ｓｍ、Ｓｒ）ＣｏＯ3である前記（３）記載の固体酸化物型燃料電池の運転方法、に特徴を有するものである。
The operation method of the solid oxide fuel cell according to (1) or (2) described above is particularly applicable to a cobaltite compound [for example, (Ba, La) CoO 3 , (Sm, Sr) CoO among air electrodes made of ceramics. 3 etc.] is effective for a solid oxide fuel cell composed of ceramics. Therefore, the present invention
(3) The method for operating a solid oxide fuel cell according to (1) or (2), wherein the solid oxide fuel cell is a solid oxide fuel cell having an air electrode containing a cobaltite compound.
(4) the cobaltite compounds are those having features (Ba, La) CoO 3, or (Sm, Sr) wherein CoO is 3 (3) The method of operating a solid oxide fuel cell according to.
水の添加率を０．５〜１０体積％に限定した理由は、水の添加率が０．５体積％未満では空気極表面で水が解離して生成するＯＨ基が少ないために十分な効果が得られず、一方、水を１０体積％を越えて添加すると水の蒸発のために消費されるエネルギーが加湿によって得られる燃料電池の出力増加分を上回ってしまうので好ましくないからである。
この発明の固体酸化物形燃料電池の運転方法において、酸化剤ガスに水を添加してやると、空気極の表面で水が解離してＯＨ基が生成し、空気極表面に結合すると空気極の表面電子構造が変化し、酸素分子の解離速度、吸着酸素原子の空気極表面拡散速度、吸着酸素原子のイオン化速度が向上し、そのため、加湿しない乾燥した酸化剤ガスを使う場合に比べて、加湿した場合の過電圧が低減し、そのために出力性能を向上させるものと考えられる。
The reason for limiting the addition rate of water to 0.5 to 10% by volume is that if the addition rate of water is less than 0.5% by volume, there are few OH groups produced by the dissociation of water on the air electrode surface, and this is sufficient On the other hand, if water is added in an amount exceeding 10% by volume, the energy consumed for evaporating the water exceeds the increase in the output of the fuel cell obtained by humidification, which is not preferable.
In the operation method of the solid oxide fuel cell according to the present invention, when water is added to the oxidant gas, water is dissociated on the surface of the air electrode to generate OH groups, and when bonded to the surface of the air electrode, the surface of the air electrode The electronic structure changes, and the dissociation rate of oxygen molecules, the surface diffusion rate of adsorbed oxygen atoms, and the ionization rate of adsorbed oxygen atoms are improved, so that it is humidified compared to using a dry oxidant gas that is not humidified. It is thought that the overvoltage in the case is reduced, and therefore the output performance is improved.
また、運転温度を３００〜８００℃に限定した理由は、運転温度を８００℃を越えると、空気極表面のＯＨ基が不安定になるので十分な効果が得られなくなるからであり、一方、運転温度を３００℃未満にすると、加湿の効果は得られるが、空気極自体の触媒活性が不十分となって、効率の良い運転ができなくなるので好ましくないからである。 The reason why the operating temperature is limited to 300 to 800 ° C. is that when the operating temperature exceeds 800 ° C., the OH group on the air electrode surface becomes unstable, so that a sufficient effect cannot be obtained. If the temperature is less than 300 ° C., the humidification effect can be obtained, but the catalytic activity of the air electrode itself becomes insufficient, and an efficient operation cannot be performed, which is not preferable.
この発明の加湿した酸化剤ガスを使う固体酸化物形燃料電池の運転方法によると、加湿しない乾燥した酸化剤ガスを使う従来の固体酸化物形燃料電池の運転方法に比べて、過電圧が１／２〜１／４程度に低減し、そのために出力性能を向上させ、固体酸化物形燃料電池産業の発展におおいに貢献しうるものである。 According to the operation method of the solid oxide fuel cell using the humidified oxidant gas according to the present invention, the overvoltage is 1/5 compared with the operation method of the conventional solid oxide fuel cell using the dry oxidant gas which is not humidified. It can be reduced to about 2 to 1/4, thereby improving the output performance and contributing greatly to the development of the solid oxide fuel cell industry.
この発明の固体電解質形燃料電池の運転方法を図面とともに一層具体的に説明する。
直径：１７ｍｍ、厚さ：０．２６ｍｍの寸法を有する（Ｌａ０．８Ｓｒ０．２）（Ｇａ０．８Ｍｇ０．１５Ｃｏ０．０５）Ｏ３−δで示される組成の電解質円板を用意した。この電解質円板の片面中央部にＮｉＯ粉末をスラリーコート法により直径：５ｍｍとなるように塗布したのち、大気中、温度：１２００℃で焼き付けることにより電解質円板の片面に燃料極前駆体層を形成した。
さらに、この電解質円板の他方の片面中央部に（Ｂａ０．６Ｓｒ０．４）ＣｏＯ3−δで示される組成の粉末をスラリーコート法により直径：５ｍｍとなるように塗布したのち、大気中、温度：１２００℃で焼き付けることにより前記電解質円板の他方の片面に空気極層を形成した。このようにして作製した発電セルの断面図を図１に示す。
The operation method of the solid oxide fuel cell of the present invention will be described more specifically with reference to the drawings.
Electrolyte disk having a composition represented by (La 0.8 Sr 0.2 ) (Ga 0.8 Mg 0.15 Co 0.05 ) O 3-δ having a diameter of 17 mm and a thickness of 0.26 mm Prepared. After applying NiO powder to the center of one surface of this electrolyte disk so as to have a diameter of 5 mm by a slurry coating method, the fuel electrode precursor layer is formed on one surface of the electrolyte disk by baking at a temperature of 1200 ° C. in the atmosphere. Formed.
Further, a powder having a composition represented by (Ba 0.6 Sr 0.4 ) CoO 3 -δ is applied to the central portion of the other surface of the electrolyte disk so as to have a diameter of 5 mm by a slurry coating method, Medium, baking was carried out at 1200 ° C. to form an air electrode layer on the other surface of the electrolyte disk. A cross-sectional view of the power generation cell thus fabricated is shown in FIG.
このようにして作製した発電セルを用いて下記のようにして図２に示される発電性能測定部品を作製した。まず、発電セルの電解質円板周辺部を図２に示されるようにシールガラスを介して二本の肉厚の上部アルミナ外筒管および下部アルミナ外筒管で上下から押え付けて固定し、さらに前記空気極層および燃料極前駆体層にそれぞれ白金メッシュを当て、空気極層および燃料極前駆体層に当てた白金メッシュの周辺部を図２に示されるように肉薄の上部アルミナ内筒管および上部アルミナ内筒管で上下から押え付け固定した。
さらに、空気極層側の電解質円板の露出部に白金参照電極を焼き付け、さらに前記二枚の白金メッシュと白金参照電極に白金ワイヤを接合した。
The power generation performance measuring component shown in FIG. 2 was manufactured as follows using the power generation cell thus manufactured. First, the periphery of the electrolyte disk of the power generation cell is fixed by pressing from above and below with two thick upper alumina outer tube and lower alumina outer tube through seal glass as shown in FIG. A platinum mesh is applied to the air electrode layer and the fuel electrode precursor layer, respectively, and a peripheral portion of the platinum mesh applied to the air electrode layer and the fuel electrode precursor layer is formed as shown in FIG. The upper alumina inner tube was pressed and fixed from above and below.
Further, a platinum reference electrode was baked on the exposed portion of the electrolyte disk on the air electrode layer side, and a platinum wire was joined to the two platinum meshes and the platinum reference electrode.
このようにして作製した発電性能測定部品を、図３に示されるように、電気炉内に設置し、さらに空気極過電圧を測定するための電圧計および発電性能を評価するための電子負荷装置にそれぞれ白金ワイヤを接続し、さらに、水素ボンベを図示されていない弁、圧力調整弁、流量計を介してホースで下部アルミナ内筒管に接続し、一方、酸素ボンベを図示されていない弁、圧力調整弁、流量計を介し、さらに、三方弁、水を張った加湿器を介してホースで上部アルミナ内筒管に接続することにより運転温度における空気極過電圧の測定装置を作製した。前記三方弁は、加湿器を通さないで発電性能測定部品に直接酸素ガスを供給できるように切り替えることができるように取付けられている。 As shown in FIG. 3, the power generation performance measuring component thus manufactured is installed in an electric furnace, and further, a voltmeter for measuring the air electrode overvoltage and an electronic load device for evaluating the power generation performance. Each platinum wire is connected, and the hydrogen cylinder is connected to the lower alumina inner tube with a hose via a valve (not shown), a pressure adjusting valve, and a flow meter, while the oxygen cylinder is connected to the lower alumina inner tube (pressure not shown) A device for measuring the air electrode overvoltage at the operating temperature was prepared by connecting to the upper alumina inner tube with a hose via a regulating valve and a flow meter, and further via a three-way valve and a humidified humidifier. The three-way valve is mounted so that it can be switched so that oxygen gas can be supplied directly to the power generation performance measurement component without passing a humidifier.
図３に示される空気極過電圧の測定装置の三法弁を調節して先ず上部アルミナ内筒管に加湿器を通さずに酸素ガスを流速：１００ｍｌ／分で供給し、同時に下部アルミナ内筒管に水素ガスを流速：１００ｍｌ／分で供給しながら電気炉を作動させ、電気炉内の発電性能測定部品を６００℃、７００℃および８００℃に保持し、酸素ガスを加湿器を通さない状態で電子負荷装置を用いて電流密度を変化させながら６００℃、７００℃および８００℃における空気極の過電圧を電圧計で測定した。 By adjusting the three-way valve of the air electrode overvoltage measuring device shown in FIG. 3, first, oxygen gas is supplied to the upper alumina inner tube without passing a humidifier at a flow rate of 100 ml / min. The electric furnace is operated while supplying hydrogen gas at a flow rate of 100 ml / min, the power generation performance measurement components in the electric furnace are maintained at 600 ° C., 700 ° C. and 800 ° C., and oxygen gas is not passed through the humidifier. The overvoltage of the air electrode at 600 ° C., 700 ° C. and 800 ° C. was measured with a voltmeter while changing the current density using an electronic load device.
次に、三法弁を調節して加湿器を通して湿度：２．８％の酸素ガスを流速：１００ｍｌ／分で上部アルミナ内筒管に供給し、さらに下部アルミナ内筒管に水素ガスを流速：１００ｍｌ／分で供給しながら電気炉を作動させ、電気炉内の発電性能測定部品を６００℃、７００℃および８００℃に保持し、電子負荷装置を用いて電流密度を変化させながら電圧計で６００℃、７００℃および８００℃における空気極の過電圧を測定した。 Next, by adjusting the three-way valve, oxygen gas with a humidity of 2.8% is supplied to the upper alumina inner tube through a humidifier at a flow rate of 100 ml / min, and hydrogen gas is supplied to the lower alumina inner tube at a flow rate of: The electric furnace is operated while supplying at 100 ml / min, the power generation performance measurement parts in the electric furnace are held at 600 ° C., 700 ° C. and 800 ° C., and the current density is changed using an electronic load device, and the voltmeter is 600 The overvoltage of the air electrode at ℃, 700 ℃ and 800 ℃ was measured.
酸素ガスを加湿器を通さない従来の固体電解質形燃料電池の運転方法を実施し、電子負荷装置を用いて電流密度を変化させながら電圧計で測定した６００℃、７００℃および８００℃における空気極の過電圧の測定値、並びに酸素ガスを加湿器を通すこの発明の固体電解質形燃料電池の運転方法を実施し、電子負荷装置を用いて電流密度を変化させながら電圧計で測定した６００℃、７００℃および８００℃における空気極の過電圧の測定値を、それぞれ空気極の過電圧を縦軸とし、電流密度を横軸としたグラフにプロットし、その結果を図４に示した。 An air electrode at 600 ° C., 700 ° C., and 800 ° C. was measured by a voltmeter while changing the current density using an electronic load device by performing a conventional solid oxide fuel cell operation method in which oxygen gas is not passed through a humidifier. The measured value of the overvoltage and the operation method of the solid oxide fuel cell of the present invention in which oxygen gas is passed through the humidifier were measured, and measured with a voltmeter while changing the current density using an electronic load device, 700 ° C., 700 ° C. The measured values of the overvoltage of the air electrode at ℃ and 800 ° C were plotted in a graph with the overvoltage of the air electrode as the vertical axis and the current density as the horizontal axis, and the results are shown in FIG.
図４に示される結果から、酸素ガスを加湿器を通さない従来固体電解質形燃料電池の運転方法を実施したときの空気極（カソード）の過電圧は、酸素ガスを加湿器を通すことにより水分を含む酸素ガスを使用するこの発明の固体電解質形燃料電池の運転方法を実施したときの過電圧と比べて高いことから、水分を含む酸素ガスを使用するこの発明の固体電解質形燃料電池の運転方法は空気極（カソード）の過電圧による発電電圧の低下が少ないことが分かる。 From the results shown in FIG. 4, the overvoltage of the cathode (cathode) when the operation method of the conventional solid oxide fuel cell in which oxygen gas is not passed through the humidifier is determined by passing oxygen gas through the humidifier. The operation method of the solid oxide fuel cell of the present invention using oxygen gas containing moisture is higher than the overvoltage when the operation method of the solid oxide fuel cell of the present invention using the oxygen gas containing is carried out. It can be seen that there is little decrease in generated voltage due to overvoltage of the air electrode (cathode).
Claims (4)
3. The method for operating a solid oxide fuel cell according to claim 1, wherein the solid oxide fuel cell is a solid oxide fuel cell having an air electrode containing a cobaltite compound.
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