NOVELTY - A solid oxide fuel cell comprises a stainless steel substrate including a coarsely porous support and a non-porous frame; a first electrode layer located in and in contact with the non-porous frame and reinforced internally by the coarsely porous support; an electrolyte layer located over the first electrode layer; and a second electrode layer located over the electrolyte layer.    USE - The invention is used in stacks to generate a power output of 1-100 kW in operations at at most 700 degrees Celsius. It is used as a local power generator, e.g., in remote locations or for residential or small commercial combined heat and power generation, and in vehicles as an auxiliary power unit, or to drive other equipment, e.g. air conditioning equipment, or in the application to an uninterruptible power supply.    ADVANTAGE - The invention avoids the problems of the fuel cell fabrication over metallic substrates. It enables the fabrication of electro-chemically active membranes of the fuel cell by sintering at at most 1000 degrees Celsius, and avoids the need to use the seals of brittle nature or other sealing attachments. The substrate used by the cell can be formed relatively cheaply and allows low-cost fabrication of the cell. The invention reduces the volume of the stainless steel in the porous region of the substrate that brings forth a significant reduction in the contamination of the electro-chemically active layers of the fuel cell with the volatile elements sourced from the stainless steel support.    DETAILED DESCRIPTION - A solid oxide fuel cell (1) comprises a stainless steel substrate (2, 8) including a coarsely porous support (3) and a non-porous frame (4, 10) housing the coarsely porous support or a number of the coarsely porous supports; a first electrode layer (5) located in and in contact with the non-porous frame and reinforced internally by the coarsely porous support of the substrate; an electrolyte layer (6) located over the first electrode layer extending at least over part of the non-porous frame and sealing with the non-porous frame; and a second electrode layer (7) located over the electrolyte layer.    An INDEPENDENT CLAIM is also included for a method of fabricating the solid oxide fuel cell, comprising providing the stainless steel substrate including the coarsely porous support and the non-porous frame; providing the first electrode layer in and in contact with the non-porous frame such that the first electrode layer is reinforced internally by the coarsely porous support; providing the electrolyte layer over the first electrode layer; and providing the second electrode layer over the electrolyte layer.    DESCRIPTION OF DRAWING(S) - The respective figures are a schematic showing a vertical cross-sectional view of a solid oxide fuel cell, and a schematic showing a plan view of a substrate structure.    Solid oxide fuel cell (1)    Stainless steel substrate (2, 8)    Coarsely porous support (3)    Non-porous frame (4, 10)    First electrode layer (5)    Electrolyte layer (6)    Second electrode layer (7)    Expanded foil (9)