Photoelectrochemical properties of polypyrrole/TiO2 nanotube arrays nanocomposite under visible light

► PPy as sensitizer directly synthesized onto TiO2NTs by potentiostatic method. ► Sensitization effect was evaluated under the visible light illumination. ► Discussed the relationship between sensitization effect and modification amount. ► Sensitization effect was improved under visible light duo to the heterojunction formed.