Yellow tungsten oxide, which is also called tungsten trioxide or WO3, is developed as a photoanode to produce photoelectrochemical cell for solar energy conversion.

Triclinic yellow tungsten oxide is also known as triclinic tungsten trioxide or triclinic WO3. According to the researchers, the triclinic phase is the thermodynamically stable form of tungsten trioxide at room temperature. They refined the triclinic yellow tungsten oxide for the first time from neutron diffraction data, which were obtained on a new high resolution powder diffractometer.

According to reports, researchers have prepared yellow tungsten oxide (tungsten trioxide/WO3) by air annealing of various W precursors, and examined the effects of W precursor type and pretreatment conditions on the physical properties and photocatalytic activity of the obtained yellow tungsten oxide powder.

Purple tungsten oxide or violet tungsten oxide, that is, γ-tungsten oxide, with an abbreviation of VTO, it is needle-shaped or thin column-shaped with the special crystal structure and extremely rich cracks. Purple tungsten oxide is suitable as an additive for positive and negative electrode materials for energy storage to significantly extend the lifespan of the lithium batteries of a single charge in the early education machine.