A Novel Solar Driven Photocatalyst: Well-Aligned Anodic WO₃ Nanotubes

Table 1

Average elemental compositions (at%) of pure W foil and anodic WO₃ nanostructures obtained in 1 M Na₂SO₄ electrolyte containing 0.5 wt% NH₄F for 15 min at 40 V obtained from EDX analysis.

Sample	W (at%)	O (at%)
Pure W foil (prior anodization)	100	—
Anodic WO3 foil (15 min anodized)	54	46