US20050064277A1 - Solid oxide fuel cell and manufacturing method thereof - Google Patents

Solid oxide fuel cell and manufacturing method thereof Download PDF

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US20050064277A1
US20050064277A1 US10/860,031 US86003104A US2005064277A1 US 20050064277 A1 US20050064277 A1 US 20050064277A1 US 86003104 A US86003104 A US 86003104A US 2005064277 A1 US2005064277 A1 US 2005064277A1
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oxide
electrode layer
solid electrolyte
grains
electrolyte layer
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Inventor
Toru Inagaki
Hiroyuki Yoshida
Tsunehisa Sasaki
Kazuhiro Miura
Takehisa Fukui
Satoshi Ohara
Kei Hosoi
Koji Hoshino
Kazunori Adachi
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Kansai Electric Power Co Inc
Japan Fine Ceramics Center
Mitsubishi Materials Corp
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Assigned to KANSAI ELECTRIC POWER CO., INC., THE, JAPAN FINE CERAMICS CENTER, MITSUBISHI MATERIALS CORPORATION reassignment KANSAI ELECTRIC POWER CO., INC., THE ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: MIURA, KAZUHIRO, HOSOI, KEI, ADACHI, KAZUNORI, HOSHINO, KOJI, INAGAKI, TORU, SASAKI, TSUNEHISA, YOSHIDA, HIROYUKI, FUKUI, TAKEHISA, OHARA, SATOSHI
Publication of US20050064277A1 publication Critical patent/US20050064277A1/en
Priority to US12/576,472 priority Critical patent/US7914941B2/en
Abandoned legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/88—Processes of manufacture
    • H01M4/8878—Treatment steps after deposition of the catalytic active composition or after shaping of the electrode being free-standing body
    • H01M4/8882—Heat treatment, e.g. drying, baking
    • H01M4/8885—Sintering or firing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/8605—Porous electrodes
    • H01M4/8621—Porous electrodes containing only metallic or ceramic material, e.g. made by sintering or sputtering
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/90—Selection of catalytic material
    • H01M4/9016—Oxides, hydroxides or oxygenated metallic salts
    • H01M4/9025—Oxides specially used in fuel cell operating at high temperature, e.g. SOFC
    • H01M4/9033—Complex oxides, optionally doped, of the type M1MeO3, M1 being an alkaline earth metal or a rare earth, Me being a metal, e.g. perovskites
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M4/00—Electrodes
    • H01M4/86—Inert electrodes with catalytic activity, e.g. for fuel cells
    • H01M4/90—Selection of catalytic material
    • H01M4/9041—Metals or alloys
    • H01M4/905—Metals or alloys specially used in fuel cell operating at high temperature, e.g. SOFC
    • H01M4/9066—Metals or alloys specially used in fuel cell operating at high temperature, e.g. SOFC of metal-ceramic composites or mixtures, e.g. cermets
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M8/00—Fuel cells; Manufacture thereof
    • H01M8/10—Fuel cells with solid electrolytes
    • H01M8/12—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte
    • H01M8/124—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte
    • H01M8/1246—Fuel cells with solid electrolytes operating at high temperature, e.g. with stabilised ZrO2 electrolyte characterised by the process of manufacturing or by the material of the electrolyte the electrolyte consisting of oxides
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/50—Fuel cells
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T29/00—Metal working
    • Y10T29/49—Method of mechanical manufacture
    • Y10T29/49002—Electrical device making
    • Y10T29/49108—Electric battery cell making

Definitions

  • the present invention relates to a solid oxide fuel cell which is provided with the electric power generation cell constituted by arranging a fuel electrode layer on one side of a solid electrolyte layer and an air electrode layer on the other side of the solid electrolyte layer, in particular, to reduction of the electrode overpotential (polarization) in an electric power generation cell of the fuel cell.
  • the solid electrolyte type fuel cell having a laminated structure for which the solid electrolyte layer composed of an oxide ion conductor is sandwiched between an air electrode layer (oxidant electrode layer) and a fuel electrode layer is progressing as the fuel cell for use in the next (third) generation electric power production.
  • oxygen air
  • a fuel gas H 2 , CO, and the like
  • Both the air electrode and the fuel electrode are made to be porous so that the gases may reach the interface between the air electrode and the solid electrolyte and the interface between the fuel electrode and the solid electrolyte.
  • the oxygen supplied to the air electrode reaches the neighborhood of the interface in contact with the solid electrolyte layer through the pores in the air electrode layer, and in that portion, the oxygen receives electrons from the air electrode to be ionized into oxide ions (O 2 ⁇ ).
  • the oxide ions move by diffusion in the interior of the solid electrolyte layer toward the fuel electrode.
  • the oxide ions reach the neighborhood of the interface in contact with the fuel electrode and in that portion, the oxide ions react with the fuel gas to produce reaction products (H 2 O, CO 2 and the like) and release electrons to the fuel electrode.
  • the electrode reaction when hydrogen is used as fuel is as follows:
  • the solid electrolyte layer is the medium for migration of the oxide ions and also functions as a partition wall for preventing the direct contact of the fuel gas with air
  • the solid electrolyte layer has a dense structure capable of blocking gas permeation. It is required that the solid electrolyte layer has high oxide ion conductivity, and is chemically stable and strong against thermal shock under the conditions involving the oxidative atmosphere in the air electrode section and the reductive atmosphere in the fuel electrode section; as a material which can meet such requirements, generally a stabilized zirconia (YSZ) substituted with yttria is used.
  • YSZ stabilized zirconia
  • the air electrode (cathode) layer and fuel electrode (anode) layer need to be formed of materials having high electronic conductivity. Because the air electrode material is required to be chemically stable in the oxidative atmosphere at high temperatures around 700° C., metals are unsuitable for the air electrode, and generally used are perovskite type oxide materials having electronic conductivity, specifically LaMnO 3 , LaCoO 3 and the solid solutions in which part of the La component in these materials is replaced with Sr, Ca and the like. Moreover, the fuel electrode material is generally metals such as Ni and Co, or cermets such as Ni-YSZ, and Co-YSZ.
  • the electric discharge reaction in the so-called fuel cell proceeds irreversibly, and the larger the current is taken out from the cell to the outside, the more the irreversibility increases and the more the cell voltage falls.
  • the maximum voltage obtainable in an actual fuel cell is the equilibrium electromotive force and the voltage falls with increasing irreversibility.
  • Such a voltage fall is caused by the diffusion-movement resistance of the electrons in the fuel electrode layer and the air electrode layer, in other words, by the ionization reaction rate of the oxide ion, and the potential deviation from the equilibrium potential in each of the air electrode layer and the fuel electrode layer is called overpotential (polarization). Electrons flow in the electrodes and ions flow in the electrolyte, and thus electric current flows to the outside. Hence, there will be a voltage loss (IR loss) corresponding to the product of the current flowing in the cell and the contact resistances between the solid electrolyte layer and the respective electrode layers and the electric resistances of the electrode materials themselves and solid electrolyte layer itself, etc., the IR loss increases proportional to the current taken out from the cell.
  • IR loss voltage loss
  • a cell stack in which a number of electric power generation cells (single cells) are jointed in series with interconnectors; however, in this case the electric resistance of the interconnectors themselves also causes the IR loss.
  • FIG. 2 shows the relation between the voltage and current density which can be taken out from a single cell.
  • the voltage which can be taken out from a single cell falls from the equilibrium electromotive force of the cell by the voltage corresponding to the sum of the absolute overpotential values and the IR losses in the fuel electrode layer and the air electrode layer; as aforementioned, the fall of the voltage becomes large with increasing current density.
  • the overpotential is especially large in the fuel electrode in a solid oxide type fuel cell which uses for the electrolyte an oxide ion conductor mainly composed of a lanthanum gallate based oxide; the fuel electrode overpotential in current fuel cells is generally of the order of 100 to 150 mV, presumably exceeding 150 mV as the case may be. If the working voltage of an electric power generation cell is set to be of the order of 0.7 V (corresponding to the current density of about 2 A/cm 2 in FIG. 2 ), the effect of the above described overpotential value of 100 to 150 mV on the voltage of 0.7 V is very large, and room is still left for improvement of the countermeasure against the electrode overpotential.
  • the present invention takes as its object the provision of a high performance solid oxide fuel cell aiming at improvement of the electric power generation efficiency by reducing the electrode overpotentials, and a manufacturing method of the solid oxide fuel cell.
  • the present invention according to claim 1 is a solid oxide fuel cell comprising an electric power generation cell ( 1 ) constituted by arranging a fuel electrode layer ( 4 ) on one side of a solid electrolyte layer ( 3 ) and an air electrode layer ( 2 ) on the other side of the solid electrolyte layer ( 3 ), wherein the above described solid electrolyte layer ( 3 ) is an oxide ion conductor mainly composed of a lanthanum gallate based oxide, the above described fuel electrode layer ( 4 ) is a porous sintered compact having a highly dispersed network structure in which a skeletal structure formed of a consecutive array of metal grains is surrounded by mixed conductive oxide grains, and the above described air electrode layer ( 2 ) is a porous sintered compact mainly composed of cobaltite.
  • the above described solid electrolyte layer ( 3 ) is an oxide ion conductor mainly composed of a lanthanum gallate based oxide
  • the above described fuel electrode layer ( 4 ) is a
  • the present invention according to claim 2 is the solid oxide fuel cell according to claim 1 , wherein the above described solid electrolyte layer ( 3 ) is a lanthanum gallate based oxide having a perovskite structure represented by La x Sr 1-x Ga y Mg 1-y-z MzO 3- ⁇ , where 0.5 ⁇ X ⁇ 3, 0.7 ⁇ Y ⁇ 0.1, and 0 ⁇ Z ⁇ 0.1 (here, M denotes one or more types of metallic elements selected from the group consisting of Co, Fe, and Ni, and 3- ⁇ denotes the number of oxygen atoms), the above described fuel electrode layer ( 4 ) comprises a skeletal structure formed of a consecutive array of metal grains, of 0.9 ⁇ m or less in average grain size, of at least one type selected from the group consisting of Ni, Pt and Ru, and the above described mixed conductive grains are made of an oxide containing cerium represented by CeO 2 or (CeO 2 ) 1-a (LO n ) a where 0 ⁇ a ⁇ 0.4 (here,
  • the present invention according to claim 3 is a solid oxide fuel cell according to claim 1 or 2 , wherein the above described air electrode layer ( 2 ) is made of an oxide mainly composed of samarium strontium cobaltite having a perovskite structure represented by Sm c Sr 1-c CoO 3- ⁇ where 0.1 ⁇ c ⁇ 0.9 (here, 3- ⁇ denotes the number of oxygen atoms) Additionally, the present invention according to claim 4 resides in that the fuel electrode layer ( 4 ) according to any one of claims 1 to 3 is manufactured by sintering, in an oxidative atmosphere at a temperature of 900° C. to 1,500° C., a powder having a highly dispersed network structure in which mixed conductive oxide grains, produced by the spray thermal decomposition method, surround the skeletal structure formed of a consecutive array of metal grains.
  • FIG. 1 is a schematic sectional view illustrating the structure of an electric power generation cell involved in the present invention.
  • FIG. 2 is a graph showing the electric power generation property of the electric power generation cell of FIG. 1 .
  • FIG. 1 shows the internal structure of an electric power generation cell (single cell) in a solid oxide type fuel cell
  • FIG. 2 shows the voltage property (electric power generation property) against the current density of the electric power generation cell.
  • the electric power generation cell 1 of a solid oxide type fuel cell comprises a three-layer structure provided with a porous air electrode layer 2 in contact with the air, a fuel electrode layer 4 in contact with the fuel such as hydrogen gas, and a solid electrolyte layer 3 which is the medium for migration of the oxide ions, and the above described air electrode layer 2 and the above described fuel electrode layer 4 are arranged to sandwich the solid electrolyte layer 3 .
  • the above described air electrode layer 2 is a porous sintered compact mainly composed of samarium strontium cobaltite, and is formed of an oxide having a perovskite structure represented by Sm c Sr 1-c CoO 3- ⁇ where 0.1 ⁇ c ⁇ 0.9 (here, 3- ⁇ denotes the number of oxygen atoms).
  • the above described solid electrolyte layer 3 is formed of an oxide ion conductor mainly composed of a lanthanum gallate based oxide having a perovskite structure represented by La x Sr 1-x Ga Y Mg 1-Y-Z MzO 3- ⁇ where 0.5 ⁇ X ⁇ 3, 0.7 ⁇ Y ⁇ 0.1 and 0 ⁇ Z ⁇ 0.1 (here, M denotes one or more types of metal elements selected from the group consisting of Co, Fe and Ni, and 3- ⁇ denotes the number of oxygen atoms).
  • the above described fuel electrode layer 4 is constituted with a porous sintered compact comprising a skeletal structure formed of a consecutive array of metal grains highly dispersed so as to form a uniformly mixed condition and the mixed conductive oxide grains which cling to the skeletal structure in a surrounding manner.
  • the skeletal structure formed of a consecutive array of metal grains one type of element selected from the group consisting of Ni, Pt and Ru can be used, and in particular, it is preferable that the skeletal structure is the one formed of a consecutive array of metal grains to form a mixed powder of 0.9 ⁇ m or less in average grain size.
  • the above described mixed conductive grains are an oxide containing cerium represented by CeO 2 or (CeO 2 ) 1-a (LO n ) a where 0 ⁇ a ⁇ 0.4 (here, L is at least one type of cation selected from the group consisting of a monovalent alkali metal cation, a divalent alkaline earth metal cation, and a trivalent rare earth element cation, and n denotes the number of oxygen atoms); the mixed conductive grains have a highly dispersed network structure surrounding a skeletal structure formed of a consecutive array of metal grains, and hence forms the fuel electrode layer having a porous structure with well regulated microstructure.
  • a powder having this highly dispersed network structure is produced by the spray thermal decomposition method, and a fuel electrode layer is manufactured by sintering the powder in an oxidative atmosphere at a temperature of 900 to 1,500° C.
  • the overpotentials of the electrodes can be reduced greatly as compared to an electric power generation cell having a conventional configuration, and thus the power generation properties of a solid oxide type fuel cell can be improved greatly.
  • Step 1 Fabrication of a Solid Electrolyte Layer
  • La 2 O 3 , SrCO 3 , Ga 2 O 3 , MgO, and CoO were prepared, weighed out in predetermined amounts, subjected to mixing with the aid of a ball mill, heated in air at 1,200° C. for calcination, and additionally pulverized with the aid of a ball mill, and thus a lanthanum gallate based oxide powder was produced.
  • the lanthanum gallate based oxide powder thus obtained was molded into a thin plate shape with the aid of a method well known in the art such as the doctor blade method and the like, and then heated at 1,450° C. in air; thus the solid electrolyte material plates (Examples 1 to 4) of the compositions and thickness values shown in Table 1 were manufactured.
  • Step 2 Production of the Fuel Electrode Layer
  • the fuel electrode layer was produced by the spray thermal decomposition method described below.
  • Nickel nitrate, cerium nitrate and samarium nitrate were prepared, weighed out in predetermined amounts, and dissolved in water to prepare an aqueous solution.
  • the solution was atomized with the aid of a supersonic atomizer to be introduced into a pipe shaped electric furnace by using air as a carrier gas, where the atomized solution was dried in an oxidative atmosphere at 1,000° C., the nitrates were heat treated and at the same time made to react with each other, and thus a mixture powder (a highly dispersed composite fine grains) was produced which has a grain structure such that composite oxide composed of cerium oxide and samarium oxide adhered to the circumference of fine grains mainly composed of nickel oxide, and has a blending ratio shown in Table 1.
  • the average grain size of the above described nickel oxide grains was set to be 0.9 ⁇ m or less, and in the present Examples, the nickel oxide grains of 0.2 to 0.5 ⁇ m in average grain size were used.
  • the highly dispersed composite fine grains were molded in a predetermined thickness on one side of each of the solid electrolyte material manufactured in the above described step 1 , with the aid of the method well known in the art such as the screen printing method, and baked in air.
  • the fuel electrode layer is a composite oxide mixture composed of nickel oxide, cerium oxide and samarium oxide
  • the reductive fuel gas introduced at the time of electric power generation reduces nickel oxide into metallic nickel.
  • Step 3 Production of the Air Electrode Layer
  • Strontium carbonate and samarium oxide were prepared, weighed out in predetermined amounts, mixed together with the aid of a-ball mill, calcined at 1,000° C. in air, and pulverlized with the aid of a ball mill to produce a samarium strontium cobaltite powder having a composition shown in Table 1.
  • the powder thus obtained was molded in a predetermined thickness on the other side of the above described solid electrolyte material plate, with the aid of the method well known in the art such as the screen printing method, and baked in air.
  • a conventional stabilized zirconia (YSZ) (specifically, 8% Y 2 O 3 -ZrO 2 ) was used, while for the air electrode layer, a perovskite type oxide material (specifically, La 0.9 Sr 0.1 CoO 3 ) was used.
  • the fuel electrode layer was the same as that in the case of the above described Examples.
  • Tables 2 and 3 show the properties at the operation temperature of 800° C. and the current density of 2,000 mA/cm 2
  • Table 3 shows the properties at the operation temperature of 660° C. and the current density of 1,000 mA/cm 2 .
  • Table 1 is as shown below. TABLE 1 Configurations of the electric power generation cells of Examples and Comparative Example Fuel electrode Air electrode Blending ratio Average Baking Average Baking Electrolyte (molar ratio) primary tem- primary tem- Thick- between grain pera- Thick- grain pera- Thick- Specifi- ness Ce 0.8 Sm 0.2 O n and Ni size ture ness size ture ness cations Composition ( ⁇ m) (Ce 0.8 Sm 0.2 O n :Ni) ( ⁇ m) (° C.) ( ⁇ m) Composition ( ⁇ m) (° C.) ( ⁇ m) Exam- La 0.9 Sr 0.1 Ga 0.8 Mg 0.2 O 3- ⁇ 110 4:6 0.5 1250 30 (Sm 0.5 Sr 0.5 )CoO 3 ⁇ 1.2 1100 30 ple 1 Exam- La 0.8 Sr 0.2 Ga 0.8 Mg 0.15 Co 0.05 O 3- ⁇ 110 5 5 5 0.3 1200 30 (Sm 0.5 Sr 0.5 )CoO 3 ⁇ 1.2
  • the voltage properties of the electric power generation cells for the high temperature operation are improved compared with those for the low temperature operation; this is because the electrode reaction proceeds more smoothly at higher temperatures.
  • the IR loss is also improved concurrently with the electrode overpotentials, and this is probably because the highly dispersed network structure, in the fuel electrode layer, made of the mixed conductive oxide grains surrounding the skeletal structure made of a consecutive array of metal grains, improves the adhesivity to the lanthanum gallate based solid electrolyte, and consequently the contact resistance between the solid electrolyte layer and the electrode is decreased.
  • the electric power generation cell is constituted by combining the solid electrolyte layer made of an oxide ion conductor mainly composed of a lanthanum gallate based oxide with the fuel electrode made of the highly dispersed network structure in which the mixed conductive oxide grains surround the skeletal structure made of a consecutive array of metal grains, and consequently the overpotentials of the respective electrodes and IR loss are reduced to improve the electric power generation efficiency, and hence a high performance solid oxide type fuel cell can be actualized.

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EP1453132A1 (de) 2004-09-01
US7914941B2 (en) 2011-03-29
US20100021792A1 (en) 2010-01-28
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JP4211254B2 (ja) 2009-01-21
WO2003049222A1 (fr) 2003-06-12

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