Ultrasonic Spray For Db Coating System – Catalyst Coating – Cheersonic
As one of the new energy sources with great development prospects around the world, PEMFC is known for its high conversion efficiency and low pollution. Protons exchange membrane fuel cell construction: MEA(PEM, catalyst and GDL) and bipolar plate. Proton exchange membrane is one of the most critical components of PEMFC, which directly affects the performance and life of the battery.
Proton exchange membranes can generate electricity, and catalysts must be coated on both sides of the film. The coating process must ensure that the thickness of the catalytic layer is uniform, and there are no defects such as cracks, particles, bubbles, edge effects, and so on. At present, the coating processes for mass production mainly include doctor blade, roll coating transfer, slit extrusion and ultrasonic spray systems.
Doctor blade coating ,the working principle is shown as below. The film substrate passes through the coating roller and directly contacts the slurry tank. The excess slurry is coated on the film substrate. When the substrate passes between the coating roller and the doctor blade, the doctor blade and the substrate The gap between determines the thickness of the coating, and at the same time scrapes the excess slurry back to form a uniform coating on the surface of the substrate. The type of scraper is mainly a comma scraper. The comma scraper is one of the key components in the coating head. Generally, a comma-like blade is formed along the generatrix on the surface of the round roller. This scraper has high strength and hardness, easy to control the coating amount and coating accuracy, and is suitable for High solid content and high viscosity slurry. It can be seen that the disadvantages of blade coating are that the catalyst coating cannot be too thick, and the uniformity is low, and the requirements for the uniformity of the substrate thickness are relatively high,and cause the wast of the catalyst solutions in a way.
Ultrasonic coating technology creates highly uniform, repeatable and durable membrane. It operates through continues vibration from the nozzle to break up the agglomerated particles into evenly dispersed functional particles, maximizing surface area exposure of the catalyst to create higher electrochemical performance of coatings. And when using the ultrasonic spray coating technology apply catalyst coating to the membranes by adjusting the spray parameters (height, flow rate and frequency of the nozzle) to control the rate of water added, because it needs to keep the thin membrane moist and not deformed.
Cheersonic has committed to the research and development of various ultrasonic equipment for more than ten years. CENG-S, CENG-M and CENG-L developed by our company is basic , programmable micro material spray coating system. Various types of catalysts suspensions including the carbon black ink, PTFE binder, ceramic slurry, platinum and other precious metal can be sprayed by using this bench-top ultrasonic spraying system capable of programming and controlling x, y, z three-axis coordinated operation are deposited onto PEM fuel cells, GDL, electrodes, electrolyte membranes and SOFC to create maximum load and high cell efficiency. Precise and controllable liquid supply system compared with different types of customized nozzles, significant reduction in materials usage and producing the highly uniform durable, repeatable and durable coatings from R & D to medium-sized batch production. The body is small and easy to place, the spraying performance is stable, and the operation is convenient.
Ultrasonic Spray For Db Coating System – Catalyst Coating – Cheersonic
