METHOD FOR HEATING A FUEL CELL SYSTEM AND FUEL CELL SYSTEM

The present invention relates to a method for heating a fuel cell system () comprising at least one fuel cell stack () with an anode portion () and a cathode portion (), and a reformer () upstream of the anode portion () for steam reforming using a fuel, the reformer () comprising a nickel-based catalyst, said method having the following steps: starting a heating process for heating the fuel cell system () with a heating device () and conducting a carbon-containing fluid and conducting steam through the nickel-based catalyst of the reformer () during the heating process. The invention also relates to a fuel cell system () which is designed to carry out a method according to the invention.