Oh, good thinking FeO3 !
Yeah, my first try at this used deposits from an experiment of yours (years back now). Took the coating off with tape and then stuck it unstuck it 100 times.
The separator thing isn't working well here. If I use straight chemicals I get straight battery type results, albeit using similar metals.
Fun though, to go at it Edison style..knowing what doesn't work can be beneficial.
Along those lines, here's a fail lol
TinMan - you mentioned graphene paste and that intrigued me, also plastic cloth which I have no idea about.
The only thing I could think of to make a paste, was activated charcoal as the carbon, crush it up to a fine powder and that would mix with the liquid ingredients to form a paste. In the vids, it seems to be a black paste sure enough, but the granules wouldn't be graphene. Well, tried it anyway.
Epsom salts and water were used to simply try it out, piece of packing plastic and silicone as separator.
Result - 0.026V
With a coffee filter and silicone as the separator, 0.560V that ran a blocking oscillator for about 10 seconds
At least the cell looks more like one of the real ones
ʎɐqǝ ɯoɹɟ pɹɐoqʎǝʞ ɐ ʎnq ɹǝʌǝu