Oxygen Rich Titania: A Dopant Free, High Temperature Stable, and Visible‐Light Active Anatase Photocatalyst
By Vinodkumar Etacheri, Michael K. Seery, S. Hinder, S. Pillai. 2011
333 citations recorded by the source corpus.
The simultaneous existence of visible light photocatalytic activity and high temperature anatase phase stability up to 900 °C in undoped TiO2 is reported for the first time. These properties are achieved by the in‐situ generation of oxygen through the thermal decomposition of peroxo‐titania complex (formed by the precursor modification with H2O2). Titania containing the highest amount of oxygen (16 H2O2‐TiO2) retains 100% anatase phase even at 900 °C, where as the control sample exists as 100% rutile at this temperature. The same composition exhibits a six‐fold and two‐fold increase in visible light photocatalytic activities in comparison to the control sample and the standard photocatalyst Degussa P‐25 respectively. Among the various parameters affecting the photocatalytic action, such as band gap narrowing, textural properties, crystallite size, and anatase phase stability, band gap narrowing was identified as the major factor responsible for the visible light photocatalytic activity. Increased Ti–O–Ti bond strength and upward shifting of the valence band (VB) maximum, which is responsible for the high temperature stability and visible light activity respectively, are identified from FT–IR, XPS, and photoluminescence (PL) spectroscopic studies. It is therefore proposed that the oxygen excess defects present in these titania samples are responsible for the high temperature stability and enhanced visible light photocatalytic activities.
Subfields: Materials Chemistry, Renewable Energy, Sustainability and the Environment
View Paper: https://www.semanticscholar.org/paper/2316643860fdf8c6e323d55d499333c4086fdc98
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In Materials Chemistry
In Renewable Energy, Sustainability and the Environment
Citations in the corpus
- Characterisation of titanium oxide layers using Raman spectroscopy and optical profilometry: Influence of oxide properties (2019, background): “A Possible reason could be the presence of excess oxygen in the oxide structure which would result in the formation of interstitial oxygen [55,56].”
- Cu-Doped TiO2: Visible Light Assisted Photocatalytic Antimicrobial Activity (2018, background): “Elemental doping is an effective strategy to tune the band gap of TiO2 by introducing new energy levels in between and by alteration of conduction band minima (CBM) and valence band maxima (VBM) [23,24].”