An interconnector for a solid-oxide electrochemical cell stack of the embodiment includes: a metal base containing an iron-based alloy containing chromium; and a protective film provided on a surface of the metal base. The protective film includes a protective film body containing at least one selected from a spinel oxide and a perovskite oxide, and dispersed phases scattered in the protective film body and containing an oxide of at least one element selected from the group consisting of rare earth elements and zirconium.

A cell including: a body having a first end portion and a second end portion; a first electrode layer electrically connected to the body; a solid electrolyte layer located on the first electrode layer; and a second electrode layer located on the solid electrolyte layer, wherein the body includes a plurality of gas-flow passages passing through the body from the first end portion to the second end portion; and the plurality of gas-flow passages include: one or more center-shifted gas-flow passages that include: a central portion and a first end portion; wherein a center of the one or more center-shifted gas-flow passages at the central portion is laterally shifted from a center of the one or more center- shifted gas-flow passages at the first end portion and a diameter of the one or more center-shifted gas-flow passages gradually increases from the central portion to the first end portion.

An electrochemical energy conversion device 10 comprising a stack of solid oxide electrochemical cells 12 alternating with gas separators 14, 16, wherein scavenger material selected from one or both of free alkali metal oxygen-containing compounds and free alkaline earth metal oxygen-containing compounds is provided in or on one or more of the positive electrode-side of the cell 12, the adjacent gas separator 14 and any other structure of the device 10 forming a gas chamber 64 between the cell and the gas separator. The invention also extends to the treated cell 12.

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.

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 including: a body having a first end portion and a second end portion; a first electrode layer electrically connected to the body; a solid electrolyte layer located on the first electrode layer; and a second electrode layer located on the solid electrolyte layer, wherein the body includes a flared gas-flow passage passing through the body from the first end portion to second end portion; and diameters of opposing end portions of the flared gas-flow passage are greater than a diameter of the flared gas-flow passage at a central portion between the opposing end portions.

A fuel cell column includes a plurality of fuel cell stacks, at least one fuel manifold configured to provide fuel to the plurality of fuel cell stacks, and at least one heat sink insert located between adjacent fuel cells of the plurality of fuel cell stacks. A fuel cell column including at least one heat sink insert located between adjacent fuel cell stacks of the column may reduce the peak temperatures of the fuel cell stacks adjacent to the heat sink inserts and may provide a smaller temperature distribution within the fuel cell stacks and within the column as a whole.

An electrochemical cell component including a bulk portion and a surface portion comprising a chromium getter multi-elemental oxide material having a formula (I): A.sub.xB.sub.yO.sub.z (I), where A is Ba, Ca, Cr, Mg, or Sr, B is Al, Bi, C, Co, Cr, Fe, Mn, Ni, Ti, Y, or Zn, x is a number selected from 1 to 8, y is a number selected from 1 to 64, and z is a number selected from 1 to 103, the multi-elemental oxide being configured to prevent chromium poisoning of the component.

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.