Proton Exchange Membrane Fuel Cell Ultrasonic Spray Coating

Description:

Proton exchange membrane fuel cell ultrasonic spraying is an efficient and low-cost ultrasonic technology that effectively prevents the aggregation of precious metal catalysts due to uneven and precipitation effects during use, allowing them to be evenly distributed on the electrode surface and ensuring their activity in chemical reactions, greatly improving the overall performance of the electrode.
In the ultrasonic spraying process, precious metal catalysts (such as iridium oxide and platinum oxide) are first mixed with high specific surface area carbon black, and perfluorosulfonic acid (PFSA) is added to form a uniform carbon based catalyst; Reuse high-frequency ultrasonic atomizing nozzles (60K and above) to atomize the solution into micrometer sized droplets, which are sprayed onto the gas diffusion layer (GDL) to form a uniform carbon based catalyst ink coating.

Parameters:

Attention:

1. Precipitation of precious metal catalysts: While using a 40K ultrasonic dispersion system in the injector to effectively prevent solution precipitation, material waste can also be saved by shortening the distance from the injector to the nozzle.
2. Selection of nozzle: Choose a convergent or wide nozzle based on the spraying area, and select the frequency according to the solution
3. Spray rate: In order to ensure uniform coating, the spray rate is often set at 0.2 milliliters per minute, which can be adjusted according to the actual situation
4. Heating adsorption platform: Using microporous ceramic heating adsorption platform to ensure the flatness of the membrane, heating the temperature to around 65 ℃ can effectively accelerate the adhesion of the catalyst and the drying of the coating
5. Movement path: The nozzle moves forward, backward, left, and right along the I-shaped pattern, depositing the catalyst suspension layer by layer to ensure that each drop of solution falls evenly on the electrode surface

Scientific Research Laboratory Qualitative Testing Ultrasonic Coating Machine