This is something I tried back at Texas A&M during my Master's research days.
You take your typical Nafion/nanoscopic Pt black/acetylene black "ink" and you mix it with anhydrous isopropyl alcohol, acetone, or butanone (MEK) at a mix of 1:20 to 1:40.
You then use an airbrush to spray it on your GDL (gas diffusion layer) carbon cloth. The carbon cloth is already "Teflonified" (hydrophobic). I used a crocheting hoop from Micahels to hold the cloth taut during spraying.
Warning...do the spraying in a hood AND wear a respirator! I found out the hard way that the ink is nasty stuff (and even then I was wearing a respirator...just not under a hood).
I would not try this if you plan to incorporate any transition or nobel metal oxides in with the Pt black as many of these oxides can be quite dangerous.
You can roll it after each coating (once it dries) to grind the electrocatalyst particles into the cloth.
This method is way more time and ink efficient than "painting" the damn stuff on.
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