Sumitomo Electric Industries, Limited

Kyoto University

Kazunari Miyamoto

Masatoshi Majima

Kazuki Okuno

Chihiro Hiraiwa

Takahiro Higashino

Hiromasa Tawarayama

Naho Mizuhara

Yohei Noda

Toshihiro Yoshida

Hisao Takeuchi

Tetsuya Uda

Donglin Han

Provided is a solid oxide fuel cell including a flat-plate-shaped cell structure including a cathode, an anode, and an electrolyte layer containing a solid oxide, a frame-shaped sealing member disposed so as to surround a periphery of the cathode, the sealing member having a larger outside diameter than the cathode, a first pressing member and a second pressing member that hold the sealing member therebetween, and a flat-plate-shaped cathode current collector adjacent to the cathode, the flat-plate-shaped cathode current collector being formed of a porous metal body having a three-dimensional mesh-like skeleton, in which the cathode current collector has a peripheral portion that is not opposite the anode, the outer edge portion of a main surface of the sealing member adjacent to the anode faces the first pressing member, the inner edge portion of the main surface of the sealing member adjacent to the anode faces the peripheral portion of the electrolyte layer, the outer edge portion of a main surface of the sealing member opposite the main surface of the sealing member adjacent to the anode is opposite the second pressing member with the peripheral portion of the cathode current collector, and the inner edge portion of the main surface of the sealing member opposite the main surface of the sealing member adjacent to the anode faces the body portion of the cathode current collector other than the peripheral portion of the cathode current collector.

Solid oxide fuel cell

A solid-oxide-electrolysis-cell-type hydrogen production apparatus includes a cell structure including a first electrode, a second electrode, and an electrolyte layer, a gas diffusion layer disposed adjacent to the first electrode, and a gas channel plate disposed adjacent to the gas diffusion layer, in which the gas diffusion layer is formed of a porous metal body having a three-dimensional mesh-like skeleton, the gas channel plate includes a first region including a first channel, a second region including a second channel, and a third region including a third channel, the first channel includes a slit extending from the center of the gas channel plate toward its outer edge at the boundary surface between the first region and the second region, letting the total area of the first channel at the boundary surface be a first opening area S, letting the total area of the second channel at the boundary surface between the second region and the third region be a second opening area S, and letting the total area of the third channel at the boundary surface between the third region and the gas diffusion layer be a third opening area S, the relationship S&#x3c;S&#x3c;Sis satisfied.

Solid-oxide-electrolysis-cell-type hydrogen production apparatus

A method for producing a cell structure includes: a step of firing a laminated body of a layer containing an anode material and a layer containing a solid electrolyte material, to obtain a joined body of an anode and a solid electrolyte layer; a step of laminating a layer containing a cathode material on a surface of the solid electrolyte layer, and firing the obtained laminated body to obtain a cathode. The anode material contains a metal oxide Ma1 and a nickel compound. The metal oxide Ma1 is a metal oxide having a perovskite structure represented by A1B1M1O(wherein: A1 is at least one of Ba, Ca, and Sr; B1 is at least one of Ce and Zr; M1 is at least one of Y, Yb, Er, Ho, Tm, Gd, In, and Sc; 0.85&#x2264;x1&#x2264;0.99; 0&#x3c;y1&#x2264;0.5; and &#x3b4; is an oxygen deficiency amount).

Method for producing cell structure

A fuel cell includes a cell structure including a first electrode, a second electrode, and an electrolyte layer, a gas diffusion layer disposed adjacent to the first electrode, and a gas channel plate disposed adjacent to the gas diffusion layer, in which the gas diffusion layer is formed of a porous metal body having a three-dimensional mesh-like skeleton, the gas channel plate includes a first region including a first channel, a second region including a second channel, and a third region including a third channel, the first channel includes a slit extending from the center of the gas channel plate toward its outer edge at the boundary surface between the first region and the second region, letting the total area of the first channel at the boundary surface be a first opening area S1, letting the total area of the second channel at the boundary surface between the second region and the third region be a second opening area S2, and letting the total area of the third channel at the boundary surface between the third region and the gas diffusion layer be a third opening area S3, the relationship S2&#x3c;S1&#x3c;S3 is satisfied.

Fuel cell

A fuel cell includes a MEA that includes a cathode, an anode, and a solid electrolyte layer disposed between the cathode and the anode, the solid electrolyte layer containing an ion-conducting solid oxide; at least one first porous metal body adjacent to at least one of the cathode and the anode and having a three-dimensional mesh-like skeleton; a second porous metal body stacked to be adjacent to the first porous metal body and having a three-dimensional mesh-like skeleton; and an interconnector adjacent to the second porous metal body. The first porous metal body has a pore size smaller than a pore size of the second porous metal body.

A fuel cell includes a MEA that includes a cathode, an anode, and a solid electrolyte layer disposed between the cathode and the anode, the solid electrolyte layer containing an ion-conducting solid oxide; at least one first porous metal body arranged to oppose at least one of the cathode and the anode; and an interconnector arranged to oppose the first porous metal body and having a gas supply port and a gas discharge port formed therein. The first porous metal body includes a porous metal body S that opposes the gas supply port and has a three-dimensional mesh-like skeleton, and a porous metal body H that has a three-dimensional mesh-like skeleton and is other than the porous metal body S. A porosity Ps of the porous metal body S and a porosity Ph of the porous metal body H satisfy a relationship: Ps&#x3c;Ph.

In an SOFC, a solid electrolyte layer and an anode are integrated with each other to provide an electrolyte layer-anode assembly. The anode contains a nickel element and a first proton conductor. The first proton conductor is composed of a first perovskite oxide having proton conductivity. The first perovskite oxide has an AXO-type crystal structure, the A-site containing Ba, the X-site containing Y and at least one selected from the group consisting of Zr and Ce. The nickel element is at least partially in the form of NiO. The anode has a porosity Pof 10% or more by volume when I/I&#x2264;0.1, where I/Idenotes a relative intensity ratio of the peak intensity Iof metallic Ni to the peak intensity Iof the NiO in an XRD spectrum of the anode.

Growing community of inventors

Itami, Japan

Kazunari Miyamoto