The cell according to the present disclosure has a support body having a length direction and a pair of main surfaces, and an element part in which a first electrode, a solid electrolyte layer having an oxide containing a rare earth element oxide as a main component, and a second electrode are stacked, in that order, on one of the main surfaces of the support body. The cell also has a first layer provided on the other main surface of one end part of the support body in the length direction, which layer contains a different amount of a rare earth element oxide that is the same oxide as the main component of the solid electrolyte layer, and is stronger than the solid electrolyte layer. A second layer is provided between the first layer and the support body, and the second layer has a higher content of a component that is the same as the component contained in the support body than the first layer, and also contains the same component as the first layer.

A stainless steel sheet for fuel cell separators comprises: a predetermined chemical composition; and Cr-containing fine precipitates at a steel sheet surface, wherein an average equivalent circular diameter of the fine precipitates is 20 nm or more and 500 nm or less, and a number of the fine precipitates existing per 1 m.sup.2 at the steel sheet surface is three or more.

In a cell stack, each of the plurality of the electrochemical cells includes an alloy member, a first electrode layer, a second electrode layer, and an electrolyte layer. The alloy member includes a base member constituted by an alloy material containing chromium, a coating film that covers at least a part of a surface of the base member, and a separation inhibiting portion that inhibits the coating film from separating from the base member. The number of the separation inhibiting portions included in the alloy member of the central electrochemical cell is larger than the number of the separation inhibiting portions included in the alloy member of the end electrochemical cell.

A method of making an interconnect for a solid oxide fuel cell stack includes providing an iron rich material containing at least 25 wt. % iron into channels of a mold, providing a powder containing 4-6 wt. % Fe, 0-1 wt. % Y and balance Cr into the mold over the iron rich material containing at least 25 wt. % iron, compacting the iron rich material containing at least 25 wt. % iron and the powder comprising 4-6 wt. % Fe, 0-1 wt. % Y and balance Cr in the mold to form the interconnect, and sintering the interconnect to form a sintered interconnect having iron rich regions having an iron concentration greater than 10% in ribs of the interconnect.

A cell of the present disclosure may include a support body having a pillar shape, a first electrode layer located on the support body, a solid electrolyte layer located on the first electrode layer, and a second electrode layer located on the solid electrolyte layer. A gas-flow passage passing through the support body in a longitudinal direction thereof is provided in an interior of the support body. A diameter of the gas-flow passage at least at a first end portion of both end portions of the gas-flow passage in the longitudinal direction is greater than a diameter of the gas-flow passage at a central portion, and thus the cell can provide improved power generation efficiency.

Object: Provided are a cell, a cell stack device, a module, and a module-containing device capable of improving power generation efficiency.

Solution: A cell (10) includes: a support body (1) having a pillar shape; a first electrode layer (3) located on the support body (1); a solid electrolyte layer (4) located on the first electrode layer (3); and a second electrode layer (6) located on the solid electrolyte layer (4). A gas-flow passage (2) passing through the support body (1) in a longitudinal direction thereof is provided in an interior of the support body (1). A diameter of the gas-flow passage (2) at at least a first end portion of both end portions of the gas-flow passage (2) in the longitudinal direction is greater than a diameter of the gas-flow passage (2) at a central portion, and thus the cell (10) can provide improved power generation efficiency.

A cell of the present invention is obtained by locating a first electrode layer on a porous supporting body, a solid electrolyte layer that is formed of a ceramic on the first electrode layer, and a second electrode layer on the solid electrolyte layer, wherein an amount of Na in the supporting body is 3010.sup.6 mass % or less.

The present invention is an interconnect for an electrochemical reactor that includes at least one microchannel. The at least one microchannel has a cross-sectional area orthogonal to a flow path and where the cross-sectional area is no greater than 1 mm.sup.2. Preferably, the microchannel has a planar projection area PPAc and the interconnect has a planar projection area PPAi, wherein the ratio of PPAc/PPAi is in the range of 0.2-0.8, or 0.3-0.7, or 0.4-0.6, or 0.45-0.55.

A fuel cell system includes fuel cells disposed in a stack and separated by interconnects, a cathode recuperator configured to heat air provided to the stack using reaction exhaust provided from the stack, a steam generator configured to receive the reaction exhaust from the cathode recuperator and generate steam using the reaction exhaust, a hot box housing the stack, cathode recuperator, and steam generator, and a Cr filter including a porous metal and configured to remove Cr vapor species from the reaction exhaust.

Stainless steel for a fuel cell separator plate and a manufacturing method therefor are disclosed. The stainless steel for a fuel cell separator plate, according to one embodiment of the present invention, comprises: a stainless base material; and a passive film formed on the stainless base material, wherein a Cr/Fe atomic weight ratio in a 1 nm or less thickness region of the stainless base material, which is adjacent to an interface between the stainless and the passive film, is 0.45 or more. Therefore, by modifying the surface of the stainless steel for a fuel cell separator plate, a low interface contact resistance and a good corrosion resistance can be obtained, and a separate additional process such as precious metal coating can be removed, such that manufacturing costs are reduced and productivity can be improved.