Gas separation in solar splitting of water

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I saw recently a new article about some kind of PEC cell immersed in water which could separate water into hydrogen and oxygen. (It was news because they found a way to protect the cell from immediate corrosion damage) It seemed that somehow the scientists had designed a cell that could put the hydrogen in one place and oxygen in another place. If this is true, how could they have the gasses go to different places? Any ideas? I will look for the original paper but I doubt i will get access to it.
 
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You can do some reading on "electrolysis" and understand the main part of the trick behind "putting the hydrogen in one place and the oxygen in another place."
 
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