Preparation and characterisation of manganese–TiO₂ nanocomposites for solar water splitting

Abstract

In this paper, Mn–TiO₂ nanocomposite films were successfully fabricated by the anodising of pure titanium plates in a non-aqueous electrolyte solution containing manganese ions. For the first time, potassium permanganate was used as the Mn source in anodising process. The morphology, structure and composition of these nanocomposite films were characterised by scanning electron microscopy, X-ray diffraction, energy dispersive X-ray spectroscopy, elemental mapping and UV–Vis absorption spectrum respectively. Characterisation of the as prepared films indicated that potassium permanganate concentration in anodising solution significantly influenced the morphology of the surface, structure and photocatalytic activity of these films. So, to access a specific morphology, a proper concentration of KMnO₄ is required. Photocatalytic activity of samples was evaluated by testing the water splitting. The Mn–TiO₂–1 nanocomposite exhibited better photocatalytic activity than did the bare TiO₂ film and other Mn–TiO₂ nanocomposites.

Keywords:

• Nanocomposite
• Nanotube
• Film
• Anodising
• Mn–TiO₂
• Solar water splitting