Cheap And Easy Technique To Produce Hydrogen From Visible Light Is Almost Ready

"only a couple of problems away"

Apparently splitting water into H2 & O is easy. keeping them seperate, once split, is a major problem.

Now what is the second problem? Any ideas.

The development is interesting, but is similar to all the other developments that have come before it. 12.9% theoretical maximum efficiency (currently 1.5%, which is the second highest rate achieved with this type of material). Even at maximum theoretical efficiency, the area required to produce the current to split Hydrogen from water is enormous. They may be able to get the price down but the area required to produce any useful power for this purpose is just, huge.

Anyone ever think we are just pushing the same old flawed ideas over and over.