The recipe for preparing a home-made supercapacitor is shown here.
Improved versions (shown in the last part of the video) have 800 F of capacitance per single Tic-Tac case, 1.2 V voltage and 6 A of short-circuit current. The 800F supercapacitor electrodes were prepared with a bit newer technology shown in .
You need only some chemicals from the kitchen, such as water cleaning filter’s active carbon, sewer cleaning liquid (NaOH, but KOH is better), iron mesh, epoxy glue, shade