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| Photoactive metal oxides | Band gap/eV | Preparation method |
|---|---|---|
| TiO2 | 3.0∼3.3 | Anodic oxidation, hydrothermal, sol–gel |
| ZnO | 3.7 | Electrodeposition, hydrothermal, chemical bath deposition |
| SnO2 | 3.6∼4.0 | Hydrothermal, electrospun |
| WO3 | 2.8 | Hydrothermal, solvothermal, co-precipitation |
| Fe2O3 | 2.2 | Electrodeposition, hydrothermal |
