[amluto]

It can’t be quite that simple. I’m not at all an expert in electrochemistry, but you can put pure zinc and pure copper together in a sealed container with nothing else except ideal electrodes until the cows come home, and you will not end up with copper oxides, zinc oxides, or any useful energy output.

[8note]

I mean, just some salty water will do the trick

[sildur]

Not the OP, but now I got it, thanks.