Revl,
Hoy, I wasn't reading closely enough. This is the opposite of a hydrogen fuel cell (that I thought it was).

They must have some catalytic membrane, eh? How long could that last; must need to use very pure water. ...No? ...Tea?
I'm gonna have to look closer at this to see how this isn't perpetual motion. Maybe they don't go beyond the hydroxyl stage, when "splitting" the water.

p.s. Re: Mike's comments:
I also was wondering if it used a battery to power the cell, but wouldn't it be easier just to use the battery directly?
That's why I assumed they must have some high-tech catalyst, maye even nano- or bio-engineered.

smile

Pyrolysis creates reduced carbon! ...Time for the next step in our evolutionary symbiosis with fire.