Roll-to-roll Ultrasonic Fuel Cell Catalyst Coating Systems

Roll-to-roll Ultrasonic Fuel Cell Catalyst Coating Systems – Cheersonic

For fuel cell fabrication, ultrasonic coating equipment is very commonly used to preparecatalyst inks. Besides ink fabrication, ultrasonic coating equipment is used to assist catalyst synthesis, catalyst support treatment MEA fabrication and humidifier among others. Among these ap-plications, ultrasonically spray coated MEAs have shownremarkable platinum mass power density.

In gen-eral, MEAs can be prepared using three different meth-ods:
1) Catalyst coated membrane (CCM), where thecatalyst layer (CL) is transferred directly onto a mem-brane;
2) Decal transfer CCM, where the CL is coated ona substrate and then transferred onto a membrane;
3) Catalyst coated substrate (CCS), which entails coatingthe CL on the gas diffusion layers (GDL).An MEA is fabricated by sandwiching a CCM be-tween two GDLs, or sandwiching a PEM between twogas diffusion electrodes (GDEs are GDL with CL).

The ultrasonic spray coating technique can be used for CCM and CCS methods. Normally, MEAs fabricated by CCM demonstrate better performance than CCS. The CCM delivers lower resistance than CCS due to improved CL-membrane ionic contact.

Roll-to-roll ultrasonic fuel cell catalyst coating system is uniquely suited for these fuel cell production applications by creating highly uniform, repeatable, and durable coatings. Ultrasonic coating systems produce highly durable, uniform, coatings of carbon-based catalyst inks onto both fuel cell and electrolysis processes for proton exchange membrane (PEM) electrolyzers such as Nafion, without deformation of the membrane.

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