I seem to recall that when we did it, many hundreds of years ago, we used something like a 6 penny nails (maybe a little larger).
I know steel and iron will work. You get electrolysis in diesel engines and it eats up the heads and block.
Probably something of a bigger size would be better more surface area. Penguin something is just telling me that copper wouldn't be what you would want to use. I'm not saying you cant use a copper wire to connect your battery to whatever you have in the water, but you would want something else maybe put some aluminum foil or nails--like PFactorD said--something on the end of the wire to actually act as the electrode(probably not the right word can't think of a better one).
I think I've seen it with aluminum. Rods would be better then foil, I think.
only if you've got bad grounds. it happens in gas engines too.
try this but don't lock the bottle, put a party baloon in a hole made in the bottle and there you go, you can fill some ballons with hidrogen with this.
Probably with the experiments I have done aluminum seems to oxidize pretty quickly when there is current put through it. Probably something like a galvanized nail wouldn't have such a problem. Then again there is salt in the water. Hey penguin perhaps you could test different types of electrodes and see what kind makes the most amount of hydrogen. That would be fun.
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