The invention relates to an automatic spraying device for preparing a fuel
cell catalytic membrane electrode, which comprises a
workbench and a spray gun, wherein the
workbench is a vacuumized heating bench which is a hollow box body internally provided with an
electric heating element, the box body is connected with a vacuumizing
system through a pipeline, and the upper surface of the box body is shaped as a flat plate and is provided with a hole capable of leading to an cavity of the box body; the spray gun is connected with a spraying
machine liquid storage hopper through a pipeline, and an ultrasonic oscillator is arranged on the bottom or side wall of the hopper; and a
nozzle of the spray gun is provided with an umbrella-shaped heating cover. The vacuumized heating bench for carryinga membrane material can be used for accelerating the
solvent volatilization and avoiding the membrane swelling and deformation. A catalyst feed solution is in an ultrasonic oscillating environment during the spraying so as to ensure the uniformity. Through heating a fan-shaped environment between the gun opening of the spray gun and the membrane material, the volatilization of the
solvent during the spraying of the feed solution can be improved. The spraying thickness can be determined through controlling the concentration, the spraying flow and the spraying times of the feed solution. Compared with the traditional manual spraying device for preparing the membrane
electrode, the automatic spraying device has the advantages of improving the spraying efficiency, ensuring the spraying uniformity and the experimental
repeatability, and correspondingly solving the problems of membrane swelling,
slurry settlement due to long-time placement and the like in the direct spraying method for preparing the membrane
electrode by introducing elements, such as the vacuumized heating bench, the ultrasonic oscillator and the like.