Enhancement of Visible-Light-Induced Photocurrent and Photocatalytic Activity of V and N Codoped TiO2 Nanotube Array Films

TL;DR

This study demonstrates that V and N codoping significantly enhances the visible-light photocurrent and photocatalytic activity of TiO2 nanotube arrays, with improved hydroxyl radical production under visible light.

Contribution

The paper introduces a novel V and N codoping method for TiO2 nanotubes, resulting in improved photocatalytic performance under visible light.

Findings

V+N codoped TiO2 nanotubes show higher photocurrent than undoped.

Enhanced hydroxyl radical generation under visible light.

Significant improvement in photocatalytic activity due to codoping.

Abstract

Highly ordered TiO2 nanotube arrays (TNAs) codoped with V and N were synthesized by electrochemical anodization in association with hydrothermal treatment. The samples were characterized by field emission scanning electron microscopy, X-ray diffraction and X-ray photoelectron spectroscopy. The photocurrent and photocatalytic activity of codoped TiO2 nanotube arrays were investigated under visible light irradiation. Moreover, the production of hydroxyl radicals on the surface of visible light-irradiated samples is detected by a photoluminescence technique using terephthalic acid (TA) as a probe molecule. It was found that the V+N co-doped TiO2 nanotube arrays showed remarkably enhanced photocurrent and photocatalytic activity than undoped sample due to the V and N codoping.