Photogeneration Cell: Electrolysis of water to hydrogen and oxygen gas occurs when the anode is irradiated with EM radiation. This has been suggested as a way of converting solar energy into a transportable form, namely hydrogen. The photogeneration cells passed the 10 percent economic efficiency barrier. Lab tests confirmed the efficiency of the process. The main problem is the corrosion of the semiconductors which are in direct contact with water. Research is going on to meet the DOE requirement, a service life of 10000 hours.
http://en.wikipedia.org/wiki/Photoelectrochemical_cell
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