NOVELTY - The method (10) comprises removing (12) nitrogen from an air stream to produce an enriched oxygen stream, communicating the enriched oxygen stream to a cathode chamber of a fuel cell, and transferring (14) the nitrogen removed from the air stream to a reactant stream and an exhaust stream of the fuel cell. The fuel stream comprises hydrogen. The reformate stream is communicated to the fuel cell. Water is removed from the reformate stream, before transferring the nitrogen to the reformate stream, by routing the reformate flow through a heat exchanger and a partial pressure adsorption bed.    USE - The method is useful for increasing the efficiency of a fuel cell.    ADVANTAGE - The method is capable of effectively and economically increasing the efficiency of a fuel cell thus enhancing the reliability of the fuel cell, and avoids the elimination of the need for complex pressure controls.    DETAILED DESCRIPTION - The method (10) comprises removing (12) nitrogen from an air stream to produce an enriched oxygen stream, communicating the enriched oxygen stream to a cathode chamber of a fuel cell, and transferring (14) the nitrogen removed from the air stream to a reactant stream and an exhaust stream of the fuel cell. The fuel stream comprises hydrogen. The reformate stream is communicated to the fuel cell. Water is removed from the reformate stream, before transferring the nitrogen to the reformate stream, by routing the reformate flow through a heat exchanger and a partial pressure adsorption bed. An additional partial pressure adsorption bed is used to produce the oxygen enriched stream during the act of communicating the another stream. An INDEPENDENT CLAIM is included for a fuel cell system.    DESCRIPTION OF DRAWING(S) - The figure shows a flow chart of a method for increasing the efficiency of a fuel cell.    Method for increasing the efficiency of a fuel cell (10)    Removing nitrogen from air reactant stream to fuel cell stack (12)    Transferring the removed nitrogen into another reactant stream. (14)