Photogeneration Cell
In this type of photoelectrochemical cell, electrolysis of water to hydrogen and oxygen gas occurs when the anode is irradiated with electromagnetic radiation. This is also referred to as artificial photosynthesis and has been suggested as a way of storing solar energy in an energy carrier, namely hydrogen. This hydrogen can then be used as fuel.
There are two types of photochemical systems with photocatalysis. One uses semiconductor surfaces as catalysts. In these devices the semiconductor surface absorbs solar energy and acts as an electrode for water splitting. The other methodology uses in-solution metal complexes as catalysts.
Photogeneration cells have 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 now ongoing to reach a service life of 10000 hours, a requirement established by the United States Department of Energy.
Read more about this topic: Photoelectrochemical Cell
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