Where to get polymer electrolytic membrane(proton exchange membrane)?

Where can you buy polymer electrolytic membrane(proton exchange membrane)?
Preferably cheaply.
Is it possible in home conditions to construct a simple hydrogen fuel cell?
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The channels in the graphite plate to hydrate the membrane or to start the hydrogen?
The anode and cathode are made of the same material or not?
July 2nd 19 at 17:05
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