Non-Chemical Ion exchange electrodes, Gas diffusion electrodes

[OMG]

background...
I was looking for ways to regenerate HCl from metals dissolved as chlorides.

I came up with the idea of using very tightly compacted copper mesh/plug as the anode (that doesn't let water pass) and having pressurized hydrogen slowly seep through the copper, so maybe then the copper instead of becoming copper chloride, would immediately displace the copper and replace it with hydrogen making HCl gas. (seeing hydrogen should replace copper according to the activity series posted in the data section). There are some other things that need to be done to make sure the HCl gets out of the tank, etc. but.. anyway, this led me to do more searching..

foreground...
So then I found about gas diffusion electrodes and ion exchange membranes and bla bla bla.

So what is a hydrogen gas diffusion electrode? Is it like platinum - that will absorb hydrogen into solution?

Then I've also seen some reference to ion exchange electrodes.
Has anyone had experience with these or know if they are actually used, or are they just inventors dreams.

Any references to information would be great. thanks.
I will post useful links as I find them as well.

 

[Lino1406]

Only by high temp. heating in the solid state
of metal chlorides with water of crystallization