Advantages of spraying fuel cell with ultrasonic atomizer
A variety of fuel cells operate at the anode (used to oxidize the fuel and convert it into protons or hydrogen cations and electrons) and at the cathode (used to convert hydrogen cations and oxygen into electrons)
The catalyst is used in water treatment. Precious metals, nano carbon or other nano materials are usually used as catalysts. This kind of catalyst material needs to be synthesized first, and then
Spray on electrode surface for fuel cell.
The ultrasonic nozzle can spray the catalyst material evenly on the electrode or membrane substrate of the fuel cell. The synthesized catalyst particles are usually in suspension state and need to be treated
It is evenly sprayed on the electrode or membrane of the fuel cell. In general, the coating needs to be applied in the form of a continuous thin layer to achieve the required thickness and electrical properties. Current
Some spraying methods used include dip coating, air atomizing nozzle, ultrasonic nozzle, screen printing machine and manual brushing.
Limitations of traditional spraying methods
Using dip coating technology, it is difficult to control the thickness and uniformity at the same time.
· pressure nozzles were originally used for spraying. Their disadvantages are the need for a slightly more complex system (used to generate pressure), a large amount of material waste and environmental pollution, which is a problem
It is particularly dangerous for the person who is spraying.
The air atomization spray valve will produce excessive spray, easily clogged, produce uneven spray form, and it is difficult to maintain precise control of liquid flow rate.
· screen printing technology is most suitable for applying thick coatings, and the ability to apply thin layers is very limited.
· manual brushing technology is subjective in nature because it depends on the skill of the operator.
Advantages of ultrasonic spray
Precision spraying
The ultrasonic atomizer nozzle can accurately, accurately and evenly coat the catalyst on the fuel cell substrate, so as to minimize the over spray and reduce the waste
To a minimum. Fuel cell catalysts are part of a clean, sustainable energy future. In order to improve the efficiency and reduce the manufacturing cost of hydrogen fuel cells, a lot of efforts are being made. Much attention has been focused on the stack, especially on the catalyst coated membrane and gas diffusion layer. Many coatings are used in the stack, among which
Many coatings need to be applied thinly. If the coating is uniformly covered and there are no defects, the performance of the fuel cell can be improved.
The ultrasonic nozzle can produce a softer and more effective spray, control the shape of the spray pattern, and accurately start and stop the liquid spray, so that it can be produced.
More uniform coating. Ultrasound has been used in many fuel cell related technologies, such as proton exchange membrane (PEM) fuel cell, gas diffusion layer
GDL, solid oxide fuel cell, electrode and electrolyte membrane.
Avoid overspray
Ultrasonic nozzles produce gentle low-speed spray, thereby minimizing the excessive spray. When low velocity gas is used to shape the spray plume of ultrasonic nebulizer,
The highest transfer efficiency of expensive materials is possible. This technology can achieve a larger flow regulation ratio, thus maximizing the flexibility of the atomization platform. Macropore
The nozzle and ultrasonic make it possible to atomize high solids without worrying about clogging. The titanium structure of the nozzle makes it highly inert to many solvents, so it has good performance
High reliability and long service life.