Abstract: A second mold is placed on a planar surface of a first mold to form a first mold cavity, which is filled with a first material slurry containing a first material powder and the molded slurry is caused to set, thereby forming a first molded part on the planar surface of the first mold. A third mold is placed on the planar surface of the first mold from which the second mold is removed and on which the first molded part is formed, thereby forming a second mold cavity. The second mold cavity is filled with a second material slurry which contains a second material powder different from the first material powder so as to mold the slurry in contact with the first molded part. The molded slurry is caused to set, thereby forming a second molded part on the planar surface of the first mold.

Abstract: A fuel cell stack (100) includes a first supporting substrate (5a), a first power generation element, a second power generation element, a second supporting substrate (5b) and a communicating member (3). The first supporting substrate (5a) includes a first substrate main portion, a first dense layer, and a first gas flow passage. The first dense layer covers the first substrate main portion. The second supporting substrate (5b) includes a second substrate main portion, a second dense layer, and a second gas flow passage. The second dense layer covers the second substrate main portion. The communicating member (3) extends between a distal end portion (502a) of the first supporting substrate (5a) and a distal end portion (502b) of the second supporting substrate (5b) and communicates between the first gas flow passage and the second gas flow passage.

Abstract: A fuel cell stack (100) includes a first power generation element, a first supporting substrate (5a), a second power generation element, a second supporting substrate (5b) and a communicating member (3). The first supporting substrate (5a) includes a first substrate main portion, a first dense layer, and a first gas flow passage. The first dense layer covers the first substrate main portion. The first gas flow passage extends from a proximal end portion (501a) to a distal end portion (502a). The second supporting substrate (5b) includes a second substrate main portion, a second dense layer, and a second gas flow passage. The second dense layer covers the second substrate main portion. The second gas flow passage extends from a proximal end portion (501b) to a distal end portion (501b).

Abstract: A fuel cell includes an anode, a solid electrolyte layer, a barrier layer, and a cathode. The anode includes a transition metal and an oxygen ion conductive material. In the interface region within 3 micrometers from the interface with the solid electrolyte layer of the anode after reduction, the content rate of silicon is less than or equal to 200 ppm, the content rate of phosphorous is less than or equal to 50 ppm, the content rate of chromium is less than or equal to 100 ppm, the content rate of boron is less than or equal to 100 ppm, and the content rate of sulfur is less than or equal to 100 ppm.

Abstract: A fuel cell comprises an anode, a cathode, a solid electrolyte layer, and a current collecting member. The cathode contains a perovskite composite oxide as a main component and contains a compound that includes at least one of S and Cr as a secondary component. The cathode has a surface facing the current collecting member. The surface of the cathode includes a first region that is electrically connected to the current collecting member and a second region that is separated from the current collecting member. The first region and the second region respectively contain a main phase that is configured from a perovskite composite oxide and a secondary phase that is configured from the compound. The occupied surface area ratio of the secondary phase in the first region is greater than the occupied surface area ratio of the secondary phase in the second region.

Abstract: A fuel cell stack includes seven current collecting members and six fuel cells that are alternate stacked with reference to the stacking direction. Each of the six fuel cells includes an anode, a cathode and a solid electrolyte layer that is disposed between the anode and the cathode and contains a zirconia-based material as a main component. The six fuel cells include a first fuel cell disposed in the center with reference to the stacking direction, and a second fuel cell disposed in one end with reference to the stacking direction. An intensity ratio of tetragonal crystal zirconia to cubic crystal zirconia in a Raman spectrum of the solid electrolyte layer of the first fuel cell is greater than an intensity ratio of tetragonal crystal zirconia to cubic crystal zirconia in a Raman spectrum of the solid electrolyte layer of the second fuel cell.

Abstract: A fuel cell comprises an anode, a cathode, and a solid electrolyte layer disposed between the anode and the cathode. The cathode includes a perovskite oxide as a main component. The perovskite oxide is expressed by the general formula ABO3 and includes at least one of La and Sr at the A site. The cathode includes a surface region that is within 5 micrometers from the surface opposite the solid electrolyte layer. The surface region contains a main phase configured by the perovskite oxide and a secondary phase that is configured by strontium oxide. The occupied surface area ratio of the secondary phase in a cross section of the surface region is greater than or equal to 0.05% to less than or equal to 3%.

Abstract: A fuel cell comprises an anode, a cathode, and a solid electrolyte layer disposed between the anode and the cathode. The solid electrolyte layer contains a zirconia-based material as a main component. A first intensity ratio of tetragonal crystal zirconia to cubic crystal zirconia in a Raman spectrum in a central portion of the solid electrolyte layer is greater than a second intensity ratio of tetragonal crystal zirconia to cubic crystal zirconia in a Raman spectrum of an outer edge.

Abstract: A fuel cell comprises an anode, a cathode, and a solid electrolyte layer. The solid electrolyte layer includes a first region disposed on the anode and a second region disposed between the first region and the cathode. The ratio of the ceria-based material in the first region is less than or equal to 0.5%. The ratio of the tetragonal crystal zirconia in the first region is greater than or equal to 3.0%. The atomic weight ratio of nickel to zirconia in the first region is less than or equal to 3.0 at %. The ratio of the ceria-based material in the second region is greater than or equal to 1.0%. The ratio of the tetragonal crystal zirconia in the second region is less than or equal to 0.1%.

Abstract: A fuel cell comprises an anode, a cathode, and a solid electrolyte layer. The cathode contains a perovskite composite oxide as a main component and contains a compound that includes at least one of S and Cr as a secondary component. The cathode has a surface on the opposite side to the solid electrolyte layer. The surface of the cathode includes a first region and a second region that is positioned downstream of the first region in relation to the direction of oxidant gas flow in which the oxidant gas flows over the surface. The first region and the second region respectively contain a main phase configured by a perovskite composite oxide and a secondary phase that is configured by the compound. The occupied surface area ratio of the secondary phase in the first region is greater than the occupied surface area ratio of the secondary phase in the second region.

Abstract: A fuel cell comprises an anode, a cathode, and a solid electrolyte layer disposed between the anode and the cathode. The cathode includes a main phase configured by a perovskite oxide including at least one of La or Sr at the A site and that is expressed by the general formula ABO3, and a secondary phase configured by strontium oxide. The occupied surface area ratio of the secondary phase in a cross section of the cathode is greater than or equal to 0.05% and less than or equal to 3%.

Abstract: A cathode material for a solid oxide fuel cell comprises a complex oxide having a perovskite structure expressed by the general formula ABO3, a content amount of P included in the complex oxide being at least 1 ppm and no more than 50 ppm, a content amount of Cr in the complex oxide being at least 1 ppm and no more than 500 ppm, and a content amount of B in the complex oxide being at least 1 ppm and no more than 50 ppm in a weight ratio relative to a total weight of the complex oxide.

Abstract: Provided is a solid oxide fuel cell (SOFC), including: a fuel electrode for allowing a fuel gas to be reacted; an air electrode for allowing a gas containing oxygen to be reacted; an electrolyte film provided between the fuel electrode and the air electrode; and a reaction prevention film provided between the air electrode and the electrolyte film. The reaction prevention film includes two layers including one layer of a porous layer having an interface with the electrolyte film; and one layer of a dense layer having an interface with the air electrode. The dense layer has a porosity of 5% or less and the porous layer has a porosity of 5.1 to 60%. The porous layer includes closed pores each having a diameter of 0.1 to 3 ?m. The porous layer includes closed pores each including a component (such as Sr) for the air electrode.

Abstract: A cathode material used in an anode and a cathode contains (Co,Fe)3O4 and a perovskite type oxide that is expressed by the general formula ABO3 and includes at least one of La and Sr at the A site. A content ratio of (Co,Fe)3O4 in the cathode material is at least 0.23 wt % and no more than 8.6 wt %.

Abstract: Provided is an SOFC, including a fuel electrode (20), a thin-plate-like interconnector (30) provided on the fuel electrode and formed of a conductive ceramics material, and a conductive film (70) formed on a surface of the interconnector (30) opposite to the fuel electrode (20). The conductive film (70) is formed of an N-type semiconductor (e.g., LaNiO3). The N-type semiconductor generally has the property of exhibiting a smaller conductivity (a current hardly flows) at higher temperature. Therefore, a portion with a higher current density (thus, a portion with higher temperature) in the conductive film (70) in the vicinity of the interconnector (30) has a smaller conductivity (a current hardly flows). By virtue of this action, even though a “fluctuation in current density of a current flowing through the interconnector (30) and an area in the vicinity thereof” occurs for some reasons, the fluctuation can be suppressed.

Abstract: A fuel cell includes an anode, a solid electrolyte layer, a barrier layer, and a cathode. The anode includes a transition metal and an oxygen ion conductive material. In the interface region within 3 micrometers from the interface with the solid electrolyte layer of the anode after reduction, the content rate of silicon is less than or equal to 200 ppm, the content rate of phosphorous is less than or equal to 50 ppm, the content rate of chrome is less than or equal to 100 ppm, the content rate of boron is less than or equal to 100 ppm, and the content rate of sulfur is less than or equal to 100 ppm.

Abstract: A fuel cell (10) includes an anode (11), a solid electrolyte layer (12), a barrier layer (13), and a cathode (14). The anode (11) includes a transition metal and an oxygen ion conductive material. In the interface region (R) within 3 micrometers from the interface with the solid electrolyte layer (12) of the anode (11) after reduction, the content rate of silicon is less than or equal to 200 ppm, the content rate of phosphorous is less than or equal to 50 ppm, the content rate of chrome is less than or equal to 100 ppm, the content rate of boron is less than or equal to 100 ppm, and the content rate of sulfur is less than or equal to 100 ppm.

Abstract: On each of upper and lower surfaces of a flat-plate-like support substrate having a longitudinal direction and having fuel gas flow channels formed therein, a plurality of power-generating elements A connected electrically in series are disposed at predetermined intervals along the longitudinal direction. On each of the upper and lower surfaces of the support substrate, a plurality of recesses are formed at predetermined intervals along the longitudinal direction. Each of the recesses is a rectangular-parallelepiped-like depression defined by four side walls arranged in a circumferentially closed manner and a bottom wall. That is, in the support substrate, frames are formed to surround the respective recesses. Fuel electrodes of the power-generating elements A are embedded in the respective recesses.

Abstract: A compact of a support-member divided-member, which has a shape formed by dividing a support member into two in the thickness direction so as to divide the fuel channel into two in the thickness direction, is manufactured by a gel cast method in which slurry is filled in a molding die. A compact of a fuel-side electrode and a compact of an electrolyte are successively stacked on the upper surface of the compact of the support-member divided-member, whereby a compact of a cell divided member is obtained. The two compacts of the cell divided member are bonded and sintered, whereby an SOFC cell (sintered body) in which an oxygen-side electrode is not formed is formed. A compact of the oxygen-side electrode is formed respectively on the upper and lower surfaces of the sintered body, and then, the compact of the oxygen-side electrode is sintered, whereby the SOFC cell is completed.

Abstract: A cathode material contains a main component being a complex oxide having a perovskite structure expressed by a general formula ABO3. The perovskite structure includes at least one of La and Sr at the A site. A occupied surface area ratio of a plurality of comparable crystal orientation domains is at least 10%. The plurality of comparable crystal orientation domains is defined by boundaries exhibiting a crystal orientation difference of at least 5 degrees in a crystal orientation analysis of a cross section by a method of electron backscatter diffraction.