Fuel cell for the application of ultrasonic spraying equipment
Fuel cells have many advantages. Fuel cells can operate at a higher efficiency than internal combustion engines. Fuel cells have lower emissions than internal combustion engines. The hydrogen fuel cell emits only water, so it does not emit carbon dioxide, nor does it produce smoke and air pollutants that cause health problems during operation. Therefore, fuel cells, which are clean energy sources, are also widely used in industrial production.
Ultrasonic spraying system
The component spraying of fuel cells is an important link in the production of fuel cells. Ultrasonic spraying system is used for the spraying of fuel cell components due to its uniform spraying and high spraying efficiency. The following mainly introduces the core components of the fuel cell, the ultrasonic spray system and so on.
The fuel cell
The spraying of fuel cell mainly involves the spraying of its core component-membrane electrode assembly. The core of the PEM fuel cell is the membrane electrode assembly (MEA), which includes the membrane, catalyst layer and gas diffusion layer (GDL). The following mainly introduces the polymer electrolyte membrane and the catalyst layer.
Polymer electrolyte membrane, or PEM (also known as proton exchange membrane, is a specially treated material that only conducts positively charged ions and blocks electrons. PEM is the key to fuel cell technology, which allows only necessary ions to pass through the anode Between the polymer electrolyte membrane and the cathode. A layer of catalyst needs to be added on both sides of the polymer electrolyte membrane, one side is the anode layer, and the other side is the cathode layer. On the anode side, the catalyst enables hydrogen molecules to split into protons and electrons. On the cathode side , The catalyst generates water by reacting with the protons generated by the anode, thereby reducing oxygen.
The catalyst materials used in fuel cells can be synthesized by ultrasonic nozzles, and then sprayed onto the surface of polymer electrolyte membranes for use in fuel cells. The ultrasonic spraying system can be used to accurately, accurately and uniformly spray the catalyst onto the electrolyte membrane layer, thereby minimizing overspray, which plays a significant role in spraying equipment optimization, repeatability, sustainability and cost saving. effect.
Generally, the membrane layer of a fuel cell requires a continuous thin coating to achieve the required thickness, texture, and electrical properties. The use of traditional air atomized spray valve is easy to cause overspray, clogging, and it is easy to produce uneven spray and it is difficult to maintain precise control of the liquid flow. Ultrasonic nozzles can produce a soft, effective spray and uniform coating. In addition, the shape of the spray and the start and stop procedures of the equipment can be precisely controlled. Ultrasonic spraying can precisely control the coating pattern and coating thickness. Therefore, the ultrasonic nozzle is a more suitable choice.
Ultrasonic nozzles can be used to synthesize fuel cell catalyst nanomaterials through chemical vapor deposition or spray pyrolysis technology. Ultrasonic nozzles can also be used to spray catalyst materials on electrodes or membrane substrates. The synthesized catalyst particles are usually suspended to form an "ink", which then needs to be sprayed onto the electrode or membrane in an appropriate amount for use in a fuel cell. Ultrasonic spray technology is very suitable for various high and low temperature PEM, DMFC and SOFC fuel cells.
