Studies have shown that nonmetal doping can improve photocatalytic property of yellow tungsten oxide. For example, some experts prepared N-doped tungsten oxide photocatalyst by sol-gel-ammonia-oxygen calcination, and characterized and analyzed the structural properties of the samples by SEM, XRD, XPS, and DRS. They also investigated the effect of N doping on the catalytic activity of yellow tungsten oxide for photolysis of water to make oxygen by comparative experiments.
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The results show that after N doping and sintering at 500 °C for 3 h in a NH3/O2 mixed atmosphere, N enters yellow tungsten oxide lattice, but tungsten oxide crystal form and morphology are not changed. N-doped tungsten oxide remains monoclinic crystal structure, but a small amount of unknown new phases appeared in the sample and resulted in finer particle size and increased lattice distortion. At the same time, doping caused an increase in W4+ content and oxygen vacancies on powder surface. Certain lattice defects and oxygen vacancies are beneficial to red shift of response wavelength of catalyst, and light absorption performance is enhanced. N-doped tungsten oxide photocatalyst has an average oxygen evolution rate of 66.8 μmol / (L · g · h) under 12 h of UV irradiation, which is 1.41 times that of pure yellow tungsten oxide, and its photolysis rate under visible light radiation is also lower than undoped samples increased by 24.5%. The results show that nonmetal doping can indeed improve photocatalytic performance of yellow tungsten oxide.
