A novel ultramicro supercapacitor with ultrahigh charge storage capability

Like this? It's difficult to take a picture of an one atom thick material. You can also easily produce it at home if you'd like.

Or if you'd like to produce larger quantities, it seems like that's also doable at home with just a few hundred dollars of equipment: https://www.youtube.com/watch?v=3hHoL77QDkg

At least for a while, the approach was a blind search - with huge funding available to anyone claiming to be researching graphene applications, people were doing all kind of daft things with it. I don’t doubt that we’d be printing the stuff in metre-wide sheets by now if we hadn’t thrown so much money at trying to use it for everything from tuneable transistors (with the slight issue that mobility is inversely proportional to the bandgap) to throwing it into every conceivable medical application to see what sticks (with the slight caveat that every such paper I read at the time was actually talking about 50+ layer graphene, or as I’d call it “an actual pencil”).

I hope it’s in a better state now.

F = W * s / V²

AA batteries are around 4 watt hours so that’s somewhere around 6400 farads at 1.5V to do the same work. You need a 7f capacitor just to get within a factor of 1000 of the energy density of an alkaline cell. Ultra caps at present are in that neighborhood. So three orders of magnitude off.

Charcoal supercaps are limited to around 2.7 volts, and Maxwell Technologies made a huge deal out of getting their caps from 2.5V to 2.7V. That exponent makes that a 8% increase in voltage but a > 16% increase on power.

Nobody mentions the operating voltage of grapheme in this article.