Titanium substrate was subjected to anodization and electrodeposition techniques to prepare tin oxide decorated tungsten oxide doped TiO₂ nanotube (Sn-WTNT) films. Then, they were used as photoanodes in photoelectrochemical (PEC) water splitting to produce hydrogen. The samples were characterized by different techniques including field emission scanning and transmission electron microscopies (FE-SEM and TEM), X-ray diffraction (XRD), energy-dispersive X-ray spectroscopy (EDX), UV–Vis DRS and Raman spectroscopies. The photoelectrochemical behavior of the samples was studied by linear sweep voltammetry (LSV) and chronoamperometry. Furthermore, the impact of tin electrodeposition time on the photocatalytic behavior of the Sn-WTNT photoelectrodes in PEC water splitting has been investigated. The highest PEC activity was shown by WT5 photoelectrode, (WT5 = Sn-WTNTwhich was …