Yellow tungsten oxide, which is also called tungsten trioxide or WO3, is developed as a photoanode to produce photoelectrochemical cell for solar energy conversion.
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According to the researchers, the photoelectrochemical cell has acquired popularity among researchers in the past years, mainly because of its possible use in solar energy conversion. The major problem at present is to find a semiconductor electrode with an optical band gap small enough to allow it to absorb a reasonably large portion of the solar spectrum, and at the same time being stable against photocorrosion. The researchers introduced that yellow tungsten oxide is a semiconductor with high absorption of the visible light area, meeting the abovementioned requirements although it is not very efficient at solar wavelengths. They designed the WO3 bilayer electrodes composed of WO3 top and bottom layers for photoelectrochemical cells. The bilayer electrodes give a significant enhancement in photoelectrochemical cells performance compared with WO3 monolayer electrodes deposited at 573 or 773 K, because of a combination of favorable effects.
