The photocatalytically active redox property of tungsten oxide (WO₃) refers to its ability to promote oxidation and reduction reactions under light conditions. The redox nature of photocatalytic activity is crucial for many photocatalytic reactions, including water splitting, organic matter degradation, carbon dioxide reduction, etc.
Under light conditions, tungsten oxide can generate electron-hole pairs by absorbing light energy. These electron-hole pairs can participate in redox reactions. Specifically, surface defect sites such as oxide defects and oxygen vacancies on the surface of tungsten oxide can provide active sites to adsorb gas molecules or reactive substances in solution.
For oxidation reactions, the photocatalytic activity of tungsten oxide can generate reactive oxygen species (such as oxygen ions or oxygen radicals) by trapping photogenerated holes. These oxygen species have strong oxidizing power and can oxidize organic substances or other substances in redox reactions.
For reduction reactions, the photocatalytic activity of tungsten oxide can be achieved by trapping photogenerated electrons, thereby forming active reducing species (such as free electrons or negative ions). These reducing species have strong reducing power and can reduce oxidized species or other species in redox reactions.
Through the redox nature of this photocatalytic activity, tungsten oxide can realize the oxidation and reduction steps in the photocatalytic reaction, thereby promoting the specific reaction. This has important implications for a range of environment- and energy-related applications, such as water splitting for hydrogen production, photocatalytic degradation of organic pollutants, carbon dioxide reduction for renewable fuels, etc.
It should be noted that the photocatalytically active redox properties of tungsten oxide are affected by many factors, including the crystal structure of the material, surface defects, light absorption capacity, carrier separation and transport efficiency, etc. Therefore, by adjusting these factors, the photocatalytic active redox properties of tungsten oxide can be optimized, and its catalytic efficiency and selectivity can be improved.
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