Tungsten oxide nanopowder, which may be applied in manufacturing thermal insulation paper, has certain photocatalytic properties, but its photocatalytic activity is not high. So, it is necessary to study methods for improving the photocatalytic activity of tungsten oxide. Some researchers have found that the photocatalytic performance of tungsten oxide materials can be improved by semiconductor composite methods. Moreover, with the deepening of research, researchers have found that multi-component composites can improve more on the photocatalytic performance of tungsten oxide materials when compared with binary composites.
For example, the CdS/TiO2/WO3 ternary composite photocatalyst was studied. And it was found that the photocatalytic activity of the ternary composite photocatalyst was higher than that of any two-phase composite photocatalyst. Some scholars believe that photo-generated carriers can migrate between three-phase semiconductors on this ternary photocatalyst, which will more effectively improve the separation of photo-generated carriers. The photocurrent test found that the photocurrent of the ternary composite photocatalyst was 2-3 times that of any two-phase composite photocatalyst.
It can be concluded from the above analysis that although the redox ability of the photogenerated carriers is decreased after the two-phase or multi-phase semiconductor is combined, the photocatalytic performance of the composite sample is still improved.
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