Electrodeposition of V2O5 on TiO2 nanorod arrays and their electrochromic properties

Abstract

This paper shows a simple approach for the electrodeposition of V₂O₅ nanoparticles on a TiO₂ nanorod arrays substrate by combining hydrothermal and electrochemical deposition methods. The electrochemical and optical properties of the TiO₂/V₂O₅ hybrid film have been investigated and the results show that the hybrid film has obviously better electrochemical and electrochromic properties compared with the single V₂O₅ thin film. The TiO₂/4cir-V₂O₅ hybrid film shows the most improved electrochromic properties with excellent cyclic stability, outstanding transmittance modulation (50% at 780 nm) and high coloration efficiency (28 C⁻¹ cm² at 780 nm). The modified electrochromic properties are mainly due to the TiO₂ nanorod array structure, which contributes to improve the structural stability of the V₂O₅ film and benefits the intercalation/deintercalation process of Li⁺ ions within the V₂O₅ film.