Abstract: A solid oxide fuel cell includes a metal support cell, in which an anode layer containing nickel, an electrolyte layer and a cathode layer are stacked on a metal support portion. In the method for activating the anode layer in the solid oxide fuel cell, first, an oxygen-containing gas is introduced into the anode layer to oxidize the nickel. Next, a hydrogen-containing gas HG is introduced into the anode layer to reduce the nickel oxide formed by oxidizing the nickel, and to increase conduction paths of the nickel that electrically connect the electrolyte layer to the metal support part in the anode layer.

Abstract: A control method for a fuel cell system that includes a solid oxide fuel cell configured to generate power upon receipt of supply of an anode gas and a cathode gas includes an anode protection execution determination process of performing execution determination of an anode protection process of applying a predetermined protection current to the fuel cell in order to restrain catalyst oxidation in an anode of the fuel cell. In the anode protection execution determination process, an internal impedance of the fuel cell at an anode response frequency at which an anode reaction resistance of the fuel cell is detectable is acquired, and based on the internal impedance at the anode response frequency, whether the anode protection process is to be executed or not is determined.

Abstract: A solid oxide fuel cell includes a metal support cell, in which an anode layer containing nickel, an electrolyte layer and a cathode layer are stacked on a metal support portion. In the method for activating the anode layer in the solid oxide fuel cell, first, an oxygen-containing gas is introduced into the anode layer to oxidize the nickel. Next, a hydrogen-containing gas HG is introduced into the anode layer to reduce the nickel oxide formed by oxidizing the nickel, and to increase conduction paths of the nickel that electrically connect the electrolyte layer to the metal support part in the anode layer.

Abstract: A control method for a fuel cell system that includes a solid oxide fuel cell configured to generate power upon receipt of supply of an anode gas and a cathode gas includes an anode protection execution determination process of performing execution determination of an anode protection process of applying a predetermined protection current to the fuel cell in order to restrain catalyst oxidation in an anode of the fuel cell. In the anode protection execution determination process, an internal impedance of the fuel cell at an anode response frequency at which an anode reaction resistance of the fuel cell is detectable is acquired, and based on the internal impedance at the anode response frequency, whether the anode protection process is to be executed or not is determined.