Photoelectrochemical cell
There exist currently two types of photoelectrochemical Cellule :
The cell with photolysis
It is a Electronics component which, exposed to the Lumière (Photon), breaks up the Eau into Oxygène and Hydrogène. One can then use this hydrogen in combustible batteries or driving with hydrogen.Such a photoelectrochemical cell is made of an electrode Photosensible immersed in a electrolyte or water.
This process of Photolyse has the advantage on the die Photovoltaïque of removing the need for transport of the Electric current between the photovoltaic Solar power station and the generating stations of hydrogen by hydrolysis (direct conversion bringing moreover a higher output).
The Corrosion limit currently (2006), at 240 hours lifespan of these components whereas their break-even point would be of 10 000 hours.
The solar cell nanocristalline with dye
Called Cell of Graetzel , it takes as a starting point the process of chlorophyllian Photosynthèse to produce electricity.It is composed of a layer of Dioxyde of titanium TiO2 covered on a side with a dye sensitizer and other with an electrolytic gel .
It has the advantage of not requiring a great purity of materials constituting it, contrary to the photovoltaic cells with Semi-conducteur.
Its disadvantage remains the relative thermal and chemical instability of its components.
Its current output, in August 2006, exceed the 10 %.
References
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