Room Temperature One-Step Polyol Synthesis of Anatase TiO 2 Nanotube Arrays: Photoelectrochemical Properties
2009; American Chemical Society; Volume: 25; Issue: 13 Linguagem: Inglês
10.1021/la9012747
ISSN1520-5827
AutoresNageh K. Allam, Craig A. Grimes,
Tópico(s)Transition Metal Oxide Nanomaterials
ResumoWe describe an optimized anodization process to fabricate anatase TiO2 nanotube arrays at room temperature using a polyol electrolyte. The critical roles of water and anodization voltage are investigated, and mechanistic actions are considered. The as-fabricated electrodes show low efficiency when used as photoanodes to photoelectrochemically split water; however, their efficiency is remarkably enhanced upon their annealing at temperatures as low as 300 °C. The efficiency of the annealed samples was found to increase with the anatase content in the as-anodized electrodes, suggesting that these pre-existing crystallites can act as seeding layers that enhance the nucleation and growth of further anatase crystallites.
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