Photoelectrochemical performances of MoO2/TiO2 nanotube array (TNA) heterojunctions synthesized by SILAR method

Abstract

MoO₂/TiO₂ nanotube arrays (TNAs) were synthesized by the SILAR (successive ionic layer adsorption and reaction) method via the addition of ascorbic acid as a reductor. TNAs were synthesized using a two-step anodization method on Ti foil. Characterization was performed using UV-Vis DRS, XRD, Raman spectroscopy, and FESEM-EDX. Characterization results showed that MoO₂ modification reduced the band gap from 3.21 eV to 1.56 eV, expanding light absorption into the visible region. Photoelectrochemical tests using a potentiostat with LSV and MPA methods showed that the MoO₂/TNAs electrode had a higher current density than pure TNAs, indicating increased charge separation efficiency and photoelectrocatalytic activity.