Vertically aligned hexagonal WO3 nanotree electrode for photoelectrochemical water oxidation

- A hexagonal WO3 nanotree film was fabricated on a tungsten substrate by a facile hydrothermal reaction.
- Hexagonal WO3 nanotree films efficiently oxidized water under visible-light irradiation.
- Hexagonal WO3 nanotree films can function as photo-anodes for constructing Z-scheme systems.