Anodic formation of molybdenum-doped vanadium oxide films

In this study, the anodic formation of molybdenum doped vanadium oxide films was investigated to elucidate the effect of dopant incorporation on structural evolution and electrochemical stability. Under optimized anodization conditions, structural characterization revealed a predominant monoclinic VO 2 phase, while minor regions exhibited residual V 2 O 5 arising from partial structural fragmentation. The doped films developed filamentary nanostructures that enhanced surface area and electronic activity. Potentiodynamic polarization tests demonstrated that Mo doping improved the uniformity and resistivity of the oxide layer, although anodized vanadium exhibited lower electrochemical stability than tantalum and zirconium. The corrosion current density of vanadium was 2.82 × 10⁻³ A/cm², approximately 3.4-fold and 3.8-fold higher than the values of 8.46 × 10 −4 A/cm² and 7.45 × 10 −4 A/cm² obtained for zirconium and tantalum, respectively, indicating the superior passivity of Ta 2 O 5 and ZrO 2 layers. These findings provide insight into the tunability of vanadium oxides through molybdenum doping for applications in electrochemical and functional coatings. • Anodization of vanadium sheets with molybdenum dopant reported. • Predominant formation of VO 2 observed in the anodized sheets. • A new structural configuration with vanadium oxide suggested. • Filaments formed, potentially enhancing material conductivity. • Electrochemical stability compared to tantalum and zirconium.