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Oct 3, 2016 at 14:35 comment added sa7 Not only close, but the surface must be maximized to get as much current as possible. Don't think that "nano" is too small to design at home. I don't know how to arrange pure water decomposition at home, but there are very porous substances like medical charcoal or silicagel and the ability (at least theoretical) to coat or impregnate them.
Sep 29, 2016 at 13:58 comment added Tomáš Zato You mean, for example, two copper plates very close to each other? Or do you mean something that is really "nano", that is, too small to design at home?
Sep 29, 2016 at 10:52 review Late answers
Sep 29, 2016 at 11:07
Sep 29, 2016 at 10:34 history answered sa7 CC BY-SA 3.0