NOVELTY - Fuel cell (40) comprises anode side including anode diffusion media layer and anode catalyst layer; and cathode side including cathode diffusion media layer and cathode catalyst layer. The diffusion media layers (20,24) include a blocking agent (42) that prevents or restricts gases that flow through diffusion media layers from flowing to membrane without first flowing through catalyst layers (22,26).    USE - For use as part of a fuel cell stack on a vehicle (claimed).    ADVANTAGE - The fuel cell includes a blocking agent for preventing hydrogen and air from contacting bare membrane. It prevents the reaction of air and hydrogen gases at outside edges of the catalyst layers.    DETAILED DESCRIPTION - A fuel cell comprises an anode side including an anode diffusion media layer and an anode catalyst layer; a cathode side including a cathode diffusion media layer and a cathode catalyst layer; and a membrane positioned between and in contact with the anode catalyst layer and the cathode catalyst layer, where one or both of the diffusion media layers include a blocking agent that prevents or restricts gases that flow through the diffusion media layers from flowing to the membrane without first flowing through the catalyst layers. An INDEPENDENT CLAIM is also included for a method of making a fuel cell, comprising providing an anode diffusion media layer; providing an anode catalyst layer; providing a cathode diffusion media layer; providing a cathode catalyst layer; depositing a blocking agent within one or both of the anode diffusion media layer or the cathode diffusion media layer so that the blocking agent extends within outside edges of the anode catalyst layer and/or the cathode catalyst layer, where the blocking agent prevents or restricts gases that flow through the diffusion media layers from flowing to the membrane without first flowing to the catalyst layers; and providing a membrane between and in contact with the anode catalyst layer and the cathode catalyst layer.    DESCRIPTION OF DRAWING(S) - The figure shows a cross-sectional view of fuel cell employing blocking agents in diffusion media layers.    Diffusion media layers (20,24)    Catalyst layers (22,26)    Airflow (36)    Fuel cell (40)    Blocking agent (42)