DIY Polyimide Supercaps (Laser induced Graphene)
YT Video; Source Paper; Another YT video specifically covering Laser Induced Graphene;
The idea is to make your own super caps using:
- A cheap, off the shelf, 4-5 nm, laser that's arounf 5 watts
- Kapton tap or Polyimide
- A XY cam system that you can attach the laser to.
- An electrolyte. He used sulfuric acid with a wicking material to hold it. Mentions scientists would normally use a gel type of electrolyte.
- Something to enclose it in. He sandwiched it between microscope slides.
Apparently when a laser hits Polyimide it produces a type of graphene that is "foamy" giving it a large surface area, though lower conductance. When used to make interlocking fingers of a capacitor, it can hold a decent charge.