Method for preventing pore passages from being flooded with water in catalyst layer of fuel cell

The invention discloses a method for preventing pore passages from being flooded with water in the catalyst layer of a fuel cell, and relates to fuel cells. The method comprises the following steps of 1, selecting a hydrophobing agent which does not block the catalyst pore passages according to the pore passage structure of the catalyst and the pore sizes; and 2, adding the hydrophobing agent into the catalyst slurry, thus allowing the hydrophobing agent to uniformly cover the surfaces of the particles to establish a waterproof gas-permeable membrane in the catalyst layer of the fuel cell, and thereby achieving the effect of preventing the pore passages from being flooded with water in the catalyst layer of the fuel cell. By screening the molecular weights and viscosities of the hydrophobing agent, and covering the hydrophobing agent on the surfaces of the catalyst particles, the waterproof gas-permeable membrane is established; and the waterproof gas-permeable membrane can effectively prevent the catalyst micropores from absorbing water and can also be oxygen-permeable, thus active sites in the pore passages are prevented from being flooded with water to the utmost extent, and the activity and stability of the cell are improved. The method is particularly applicable to the three-way M/N/C catalyst based more on micropores, and meanwhile also can be applied to the pores more than 10nm.