NOVELTY - A fuel cell module (300) has fuel cell stack (200); parasitic load (17) connectable across anode and cathode electrodes of fuel cell; hydrogen supply port; side stream; reactant reservoir (19) for storing an amount of hydrogen; and pressure generating device. When the fuel cell module is shutdown, the stored amount of the hydrogen is drawn from the reservoir and electrochemically reacts with the oxygen in the fuel cell module, to electrochemically consume the hydrogen and oxygen, thus leaving a second mixture that substantially comprises nitrogen.    USE - For Proton Exchange Membrane (PEM) fuel cells, Alkaline Fuel Cells (AFC), Direct Methanol Fuel Cells (DMFC), Molten Carbonate Fuel Cells (MCFC), Phosphoric Acid Fuel Cells (PAFC), Solid Oxide Fuel Cells (SOFC) and Regenerative Fuel Cells (RFC).    ADVANTAGE - The module passively reduces the overall amount of combustion of hydrogen and oxygen within the fuel cell stack during a shutdown process. This reduces rate of wear and degradation experienced by some components of a fuel cell during shutdown and restarting periods.    DETAILED DESCRIPTION - The fuel cell module comprises a fuel cell stack including at least one fuel cell, each fuel cell including an anode electrode, a cathode electrode and an electrolyte medium arranged between the anode electrode and the cathode electrode, where during normal operation the anode electrode is provided with a hydrogen and the cathode electrode is provided with a mixture containing oxygen and nitrogen. A parasitic load is connectable across the anode and the cathode electrodes. A hydrogen supply port is fluidly connectable to the anode electrode for supplying the hydrogen to the anode electrode. A side stream is fluidly connectable to the hydrogen supply and the anode electrode. A reactant reservoir is fluidly connectable to the side stream for storing an amount of the hydrogen suitable for a shutdown process of the fuel cell module, where, in use when the fuel cell module is shutdown, the stored amount of the hydrogen is drawn from the hydrogen reservoir and electrochemically reacts with the oxygen in the fuel cell module, to electrochemically consume the hydrogen and oxygen, thus leaving a mixture that substantially comprises the nitrogen. A pressure generating device is fluidly connectable to the side stream and positioned upstream of the hydrogen reservoir for pressurizing and delivering the hydrogen from the hydrogen supply to the reactant reservoir. INDEPENDENT CLAIMS are also included for:    (1) reactant supply system for a fuel cell stack, comprising a hydrogen supply port; a oxygen supply port; a parasitic load; a side stream; a reactant reservoir; and a pressure generating device; and    (2) process for shutting down a fuel cell.    DESCRIPTION OF DRAWING(S) - The figure is a schematic diagram showing an arrangement of a fuel cell module.    Flow control device (14)    Parasitic load (17)    Hydrogen reservoir (19)    Fuel cell stack (200)    Fuel cell module (300)