Tungsten oxide nanopowder may be applied for the preparation of heat insulation coating, mainly reflecting its photochromic properties. It means that tungsten oxide plays a high thermal insulation role in the field of buildings and vehicles. Nano grain size tungsten oxide may also be used for the photolysis of water to produce hydrogen, and for the treatment of organic pollutants, mainly reflecting its photocatalytic performance. It means that tungsten oxide plays a role in photocatalysis and degradation, respectively. However, the photocatalytic activity of tungsten oxide is not high, and thus it needs to be increased by metal oxide loading or metal loading.
Some metal oxides can play a catalytic role, such as RuO2 and NiO. For example, RuO2 is loaded on the surface of β-Ge3N4, and β-Ge3N4, which has almost no performance after loading, exhibits high photocatalytic performance. In this system, photogenerated electrons are injected onto RuO2 and H+ is reduced to H2, while photogenerated holes oxidize water to O2.
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