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Comparison of Photoelectrochemical Current in Amorphous and Crystalline Anodized TiO 2 Nanotube Electrodes

2019; Hindawi Publishing Corporation; Volume: 2019; Linguagem: Inglês

10.1155/2019/9848740

1687-529X

Candy C. Mercado, Michael Eric L. Lubrin, Hazel Anne J. Hernandez, Reynaldo A. Carubio,

Transition Metal Oxide Nanomaterials

The interest in TiO 2 nanotubes has resulted in a lot of studies including the effects of various parameters on the properties and performance for different applications. This study investigated the effect of anodization at a low temperature on the properties and photoelectrochemical performance. The effects of varied anodization settings on morphology, crystallinity, and PEC response were studied. Low-temperature anodization resulted in smaller pore diameter and shorter tube length. Annealing temperature affected the presence of varied phases of TiO 2 such as the prominence of anatase and amounts of rutile and amorphous TiO 2 at 125°C. To observe photoelectrochemical response, annealing at 450°C is necessary. However, a cathodic response was observed for TiO 2 nanotubes synthesized with low voltage at low temperature. Hence, amorphous titania nanotubes annealed at 125°C with thickness achieved in the anodization can be a potential material used for photocatalytic applications due to its determined cathodic photoelectrochemical response.