This cell is no more than 1mm thick and about 2x2 inches. It generates 6vdc. I'd like to figure out how to make one to test how many amps it has.
This guy has been doing a lot of work over a year and he might be on to something if he can scale up production.
He also has a prototype called mini generator. He uses a silicon graphite cell but with a slightly different electrolyte. These are not capacitors, they are generators that make their own electricity. The voltage is 3.5-v4dc, good enough to power 1-2 LED lights, or more with a voltage booster. Magnets are used to compress the layers to increase efficiency, but if he uses neodymium magnets the cost could go up to $10usd for the one cell he displays in this video. NDs are not cheap.