What are some good metal(s) to do electrolysis on? Answered

Stainless steel is a great metal for electrolysis, but if you are on a budget, you can use aluminum although it oxidises quicker.

http://en.wikipedia.org/wiki/Electrolysis
http://en.wikipedia.org/wiki/Electrolysis_of_water
http://en.wikipedia.org/wiki/Electroplating

What you want to make a hydrogen generator? If so then you will need stainless steel. This way it wont rust and last longer. Do a search on it .