Electrolysis/Fuel cell

[Jamesly]

Hello everyone, I am new to this site. I recently took a deep interest in fuel cells. I am currently preparing for a Hydrogen Fuel cell powered RC car project, but I have some questions before starting on it.

1st of all, what is the best electrode to do the electrolysis process? Iron, stainless steel, platinum wire or pencil lead?

2nd of all, how to store the hydrogen made from electrolysis?

Before I ask the third question though, this is some background information:

I know how there is some educational PEM fuel cell selling online, but I really want to make one of those myself, having part of the materials bought online is fine though.

The 3rd question is, how do I make a PEM cell that can turn hydrogen gas and oxygen directly into electricity, the one with water as waste, and I want it being mini and not space consuming.

Thank you very much for all the help, for I am only an eighth grader.