Ngk Insulators, Inc.

Takashi Ryu

Makoto Ohmori

Shinji Fujisaki

Toshiyuki Nakamura

Hirofumi Kan

Noriyuki Ogasawara

Taku Okamoto

Yoshihiko Yamamura

Toshihiro Yoshida

Shigenori Ito

Kiyoshi Okumura

Mitsuru Hattori

Sota Shimizu

Kenji Suzuki

Kunihiko Yoshioka

Naoya Takase

Hiroshi Hayashi

Tadashi Otagiri

Yuki Tanaka

Risako Ito

Genta Terazawa

Toshiaki Kuno

Yuto Yamada

Masaru Nishitoba

Masato Fukumori

An electrochemical cell includes a fuel electrode, an air electrode containing a perovskite type oxide as a main component, the perovskite type oxide being represented by a general formula ABOand containing La and Sr at an A site, and a solid electrolyte layer arranged between the fuel electrode and the air electrode. The air electrode includes a first portion and a second portion, the first portion being located on a side opposite to the solid electrolyte layer, the second portion being located on the solid electrolyte layer side. A first ratio of an La concentration to an Sr concentration detected at the first portion through Auger electron spectroscopy is at least 1.1 times a second ratio of an La concentration to an Sr concentration detected at the second portion through Auger electron spectroscopy.

Electrochemical cell

An electrochemical cell includes a porous support substrate and a power generation element portion. The support substrate includes at least one first gas channel and at least one second gas channel. The first gas channel extends from a first end portion toward a second end portion and is connected to a gas supply chamber. The second gas channel is connected to the first gas channel on the second end portion side. The second gas channel extends from the second end portion toward the first end portion and is connected to a gas collection chamber. A ratio (p/L) of a pitch pof a first gas channel and a second gas channel that are adjacent to each other to a distance L between the power generation element portion and a first end surface of the support substrate located on the first end portion side is 3.3 or less.

Electrochemical cell and cell stack device

The electrochemical cell has an anode, a cathode, and a solid electrolyte layer. The cathode contains a perovskite oxide expressed by the general formula ABOand includes at least one of Sr and La at the A site as a main component. The solid electrolyte layer is disposed between the anode and the cathode. The cathode includes a solid electrolyte layer-side region within 3 &#x3bc;m from a surface of the solid electrolyte layer side. The solid electrolyte layer-side region includes a main phase which is configured by the perovskite oxide and a second phase which is configured by CoOand (Co, Fe)O. An occupied surface area ratio of the second phase in a cross section of the solid electrolyte layer-side region is less than or equal to 10.5%.

A cell stack device includes a plurality of electrochemical cells, a manifold, a gas supply portion, and a gas collection portion. The manifold includes a gas supply chamber and a gas collection chamber that extend in a direction in which the electrochemical cells are arranged. A support substrate of an electrochemical cell includes a first gas channel and a second gas channel. The first gas channel is connected to the gas supply chamber, and the second gas channel is connected to the gas collection chamber.

Cell stack device

The electrochemical cell according to the present invention has an anode, a cathode, and a solid electrolyte layer disposed between the anode and the cathode. The cathode contains a main phase and a second phase. The main phase is configured with a perovskite oxide which is expressed by the general formula ABOand includes at least one of Sr and La at the A site. The second phase is configured with SrSOand (Co, Fe)O. An occupied surface area ratio of the second phase in a cross section of the cathode is less than or equal to 10.5%.

The electrochemical cell according to the present invention has an anode, a cathode, and a solid electrolyte layer disposed between the anode and the cathode. The cathode includes a solid electrolyte layer-side region within 3 &#x3bc;m from a surface on the solid electrolyte layer side. The solid electrolyte layer-side region has a main phase that is configured by a perovskite oxide, and a second phase that is configured by SrSOand (Co, Fe)O. The perovskite oxide is expressed by the general formula ABOand contains at least one of Sr and La at the A site. The (Co, Fe)Ocontained in the electrolyte layer-side region contains Co and Fe. An occupied surface area ratio of the second phase in a cross section of the solid electrolyte layer-side region is less than or equal to 10.5%.

Electrochemical cell including cathode with main phase of perovskite oxide and second phase of SrSO4 and (Co, Fe)3O4

An electrochemical cell includes a fuel electrode, an air electrode containing a perovskite type oxide as a main component, the perovskite type oxide being represented by a general formula ABOand containing La and Sr at the A site, and a solid electrolyte layer arranged between the fuel electrode and the air electrode. The air electrode includes a first portion and a second portion, the first portion being located on the most upstream side in a flow direction of an oxidant gas that flows through a surface of the air electrode, the second portion being located on the most downstream side in the flow direction. A first ratio of a La concentration to a Sr concentration detected at the first portion through Auger electron spectroscopy is at least 1.1 times a second ratio of a La concentration to a Sr concentration detected at the second portion through Auger electron spectroscopy.

The electrochemical cell includes an anode, a cathode active layer, and a solid electrolyte layer disposed between the anode and the cathode active layer. The cathode active layer includes a first region which is disposed facing the solid electrolyte layer, and a second region which is disposed on the first region. An average particle diameter of first constituent particles which constitute the first region is smaller than an average particle diameter of second constituent particles which constitute the second region.

The electrochemical cell has an anode, a cathode, and a solid electrolyte layer disposed between the anode and the cathode. The cathode contains a main phase which is configured by a perovskite oxide expressed by the general formula ABOand including at least one of La or Sr at the A site, and a second phase which is configured by CoOand (Co, Fe)O. An occupied surface area ratio of the second phase in a cross section of the cathode is less than or equal to 10.5%.

Electrochemical cell including cathode with main phase of perovskite oxide and second phase of CoOand (Co,Fe)O

A joining structure includes a first bonded member and a glass portion that is bonded to a surface of the first bonded member. The glass portion includes an interface region not exceeding 5 &#x3bc;m of the surface of the first bonded member, and an inner region more than 5 &#x3bc;m from the surface of the first bonded member. The interface region and inner region respectively include rod-shaped crystal particles that have three or more aspect ratios when viewed in cross section. An average orientation angle of the rod-shaped crystal particles included in the interface region is greater than or equal to 60 degrees and less than or equal to 120 degrees. A standard deviation of the orientation angle of the rod-shaped crystal particles included in the inner region is greater than a standard deviation of the orientation angle of the rod-shaped crystal particles included in the interface region.

Joining structure

An electrochemical cell includes a fuel electrode, an air electrode containing a perovskite type oxide as a main component, the perovskite type oxide being represented by a general formula ABOand containing La and Sr at the A site, and a solid electrolyte layer arranged between the fuel electrode and the air electrode. The air electrode includes a center portion and an outer peripheral portion, the center portion being located at a center of the air electrode in a plane direction perpendicular to a thickness direction of the air electrode, the outer peripheral portion surrounding the center portion in the plane direction. A first ratio of an La concentration to an Sr concentration detected at the outer peripheral portion through Auger electron spectroscopy is at least 1.1 times a second ratio of an La concentration to an Sr concentration detected at the center portion through Auger electron spectroscopy.

A fuel cell includes a porous support substrate and a power generation element portion. The support substrate includes a first end portion that is linked to a gas supply chamber and a gas collection portion, and a second end portion that is located opposite to the first end portion. The support substrate includes a first gas channel and a second gas channel. The first gas channel extends from the first end portion toward the second end portion. The first gas channel is connected to the gas supply chamber. The second gas channel is connected to the first gas channel on the second end portion side. The second gas channel extends from the second end portion toward the first end portion. The second gas channel is connected to the gas collection chamber. The support substrate is configured such that gas flows in the support substrate and moves between the first gas channel and the second gas channel, in a portion of the support substrate that is farther toward the first end portion side than the power generation element portion is.

A fuel cell stack () includes a first supporting substrate (), a first power generation element, a second power generation element, a second supporting substrate () and a communicating member (). The first supporting substrate () 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 () 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 () extends between a distal end portion () of the first supporting substrate () and a distal end portion () of the second supporting substrate () and communicates between the first gas flow passage and the second gas flow passage.

Fuel cell stack

A cell stack device includes a manifold, a fuel cell, and an oxygen-containing-gas ejection portion. The manifold includes a fuel gas supply chamber and a fuel gas collection chamber. The fuel cell extends upward from the manifold. The oxygen-containing-gas ejection portion is disposed upward of the center of the fuel cell. The oxygen-containing-gas ejection portion ejects oxygen-containing gas toward the fuel cell. A support substrate of the fuel cell includes a first gas channel and a second gas channel. The first gas channel is connected to a fuel gas supply chamber, and the second gas channel is connected to the fuel gas collection chamber. The first gas channel and the second gas channel are connected to each other in an upper end portion of the fuel cell.

A fuel cell cathode contains a perovskite oxide as a main component. The perovskite oxide is expressed by the general formula ABOand including La and Sr at the A site. A solid electrolyte layer is disposed between an anode and the cathode. The cathode has a surface on an opposite side to the solid electrolyte layer. A first ratio of a Sr concentration relative to an La concentration is less than or equal to 4 times a second ratio of the Sr concentration relative to the La concentration. The first ratio is detected by the use of X-ray photoelectron spectroscopy on the surface of the cathode. The second ratio of a Sr concentration relative to a La concentration is detected by the use of X-ray photoelectron spectroscopy on an exposed surface exposed by surface processing of the surface and positioned within 5 nm of the surface in relation to a direction of thickness.

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Nagoya, Japan

Takashi Ryu