Abstract: A membrane tube is provided for the permeative separation of a gas from gas mixtures. The membrane tube has at least two membrane tube sections, each with a porous, gas-permeable, metallic, tubular support substrate, and a membrane which is selectively permeable for the gas to be separated off. The tube also has, applied to the support substrate around the circumference, at least one connecting section which is gastight at least on the surface and by way of which the two adjacent membrane tube sections are joined, and at least one spacer in the region of the connecting section. The spacer projects in the radial direction to above the membrane.

Abstract: A porous or at least sectionally porous gas conduction part is provided for an electrochemical module. The electrochemical module has at least one electrochemical cell unit having a layer construction with at least one electrochemically active layer, and a metallic, gastight housing which forms a gastight process gas space with the electrochemical cell unit. The housing extends on at least one side beyond the region of the electrochemical cell unit, and forms a process gas conduction space open to the electrochemical cell unit, and in the region of the process gas conduction space has at least one gas passage opening for the supply and/or removal of the process gases. The gas conduction part here is adapted for arrangement within the process gas conduction space and its surface is functionalized for interaction with the process gas.

Abstract: A cathode-electrolyte-anode unit for an electrochemical functional device, in particular a high-temperature fuel cell. The unit has a multi-layer solid-state electrolyte arranged between a porous anode and a porous cathode. The solid-state electrolyte is produced by a vapor deposition process and has a sandwich-type structure consisting of at least one first layer with a lower oxygen content, and at least one second layer with a higher oxygen content. The individual layers have substantially the same composition, with the exception of oxygen.

Abstract: An electro-chemical module has a porous plate-shaped metallic carrier substrate with a gas-permeable central region and a peripheral region. A layered construction is disposed in the central region on a first side of the carrier substrate. At least one metallic gas-tight housing part is by way of a welded connection connected to the peripheral region of the carrier substrate. A gas-tight zone extends from the layered construction up to the housing part. The gas-tight zone has a gas-tight surface portion which extends superficially from the layered construction on the first side of the carrier substrate at least up to the welded connection. The welded connection by which the gas-tight surface portion is connected in a gas-tight manner to the housing part and the welding zone of which extends only through part of the thickness of the carrier substrate.

Abstract: A cathode-electrolyte-anode unit for an electrochemical functional device, in particular a high-temperature fuel cell. The unit has a multi-layer solid-state electrolyte arranged between a porous anode and a porous cathode. The solid-state electrolyte is produced by a vapor deposition process and has a sandwich-type structure consisting of at least one first layer with a lower oxygen content, and at least one second layer with a higher oxygen content. The individual layers have substantially the same composition, with the exception of oxygen.

Abstract: A plate-shaped, porous, carrier substrate produced by powder metallurgy for a metal-supported electrochemical functional device, includes a marginal region and a central region with a surface configured to receive a layer stack with electrochemically active layers on a cell-facing side of the carrier substrate. A surface section of the marginal region has a melt phase of the carrier substrate material on the cell-facing side of the carrier substrate. At least sections of a region located beneath the surface section having the melt phase have a higher porosity than the surface section disposed above them and having the melt phase.

Abstract: The substrate-supported anode for a high-temperature fuel cell comprises an at least three-layer anode laminate on a metallic substrate. Each of the layers of the anode laminate comprises yttria-stabilized zirconia and nickel, wherein the mean particle size of the nickel decreases from one layer to the next as the distance from the substrate increases. The last layer of the anode laminate, which is provided for contact with the electrolyte, has a root mean square roughness of less than 4 ?m. The overall mean pore size of this layer is typically between 0.3 and 1.5 ?m. Starting powders having a bimodal particle size distribution of yttria-stabilized zirconia and nickel-containing powder are used at least for the first and second layers of the anode laminate. The mean particle size of the nickel-containing powder is reduced from one layer to the next, whereby it is advantageously no more than 0.5 ?m in the last layer of the anode laminate.

Abstract: The invention relates to an assembly comprising an electrode, an electrolyte, and a carrier substrate. The assembly is suitable for a fuel cell. An adaptation layer for adapting the electrolyte to the electrode is disposed between the electrode and the electrolyte, wherein the mean pore size of the adaptation layer is smaller than the mean pore size of the electrode.

Abstract: The substrate-supported anode for a high-temperature fuel cell comprises an at least three-layer anode laminate on a metallic substrate. Each of the layers of the anode laminate comprises yttria-stabilized zirconia and nickel, wherein the mean particle size of the nickel decreases from one layer to the next as the distance from the substrate increases. The last layer of the anode laminate, which is provided for contact with the electrolyte, has a root mean square roughness of less than 4 ?m. The overall mean pore size of this layer is typically between 0.3 and 1.5 ?m. Starting powders having a bimodal particle size distribution of yttria-stabilized zirconia and nickel-containing powder are used at least for the first and second layers of the anode laminate. The mean particle size of the nickel-containing powder is reduced from one layer to the next, whereby it is advantageously no more than 0.5 ?m in the last layer of the anode laminate.