The influence of cobalt doping on photocatalytic nano-titania: Crystal chemistry and amorphicity

Suo Hon Lim; Cristiano Ferraris; Martin Schreyer; Kaimin Shih; James O. Leckie; T. J. White

doi:10.1016/j.jssc.2007.08.021

The influence of cobalt doping on photocatalytic nano-titania: Crystal chemistry and amorphicity

Suo Hon Lim^*, Cristiano Ferraris, Martin Schreyer, Kaimin Shih, James O. Leckie, T. J. White

^*Corresponding author for this work

Research output: Contribution to journal › Article › peer-review

24 Citations (Scopus)

Abstract

Photocatalysts of nominal composition (Ti_1-xCo_x)O_2-δ with 0.001≤x≤0.05 were prepared via a sol-gel technique followed by air firing (200-1000 °C). The incorporation of cobalt inhibited crystal growth and slightly raised the anatase to rutile transformation temperature (∼700 °C). An amorphous component was invariably significant with the maximum content (41-53 wt%) appearing simultaneously with the removal of anatase, suggesting that rutile crystallizes via an aperiodic structure. While the introduction of cobalt shifted the apparent band gap to visible light energies this did not enhance performance as there was limited miscibility of cobalt in titania, non-catalytic secondary phases were present, and active Ti³⁺ sites were displaced by cobalt.

Original language	English
Pages (from-to)	2905-2915
Number of pages	11
Journal	Journal of Solid State Chemistry
Volume	180
Issue number	10
DOIs	https://doi.org/10.1016/j.jssc.2007.08.021
Publication status	Published - Oct 2007
Externally published	Yes

ASJC Scopus Subject Areas

Electronic, Optical and Magnetic Materials
Ceramics and Composites
Condensed Matter Physics
Physical and Theoretical Chemistry
Inorganic Chemistry
Materials Chemistry

Keywords

Amorphous content
Anatase
Formic acid
Methylene blue
Photocatalytic activity
Rutile

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10.1016/j.jssc.2007.08.021

Cite this

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abstract = "Photocatalysts of nominal composition (Ti1-xCox)O2-δ with 0.001≤x≤0.05 were prepared via a sol-gel technique followed by air firing (200-1000 °C). The incorporation of cobalt inhibited crystal growth and slightly raised the anatase to rutile transformation temperature (∼700 °C). An amorphous component was invariably significant with the maximum content (41-53 wt%) appearing simultaneously with the removal of anatase, suggesting that rutile crystallizes via an aperiodic structure. While the introduction of cobalt shifted the apparent band gap to visible light energies this did not enhance performance as there was limited miscibility of cobalt in titania, non-catalytic secondary phases were present, and active Ti3+ sites were displaced by cobalt.",

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AU - Ferraris, Cristiano

AU - Schreyer, Martin

AU - Shih, Kaimin

AU - Leckie, James O.

AU - White, T. J.

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KW - Formic acid

KW - Methylene blue

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The influence of cobalt doping on photocatalytic nano-titania: Crystal chemistry and amorphicity

Abstract

ASJC Scopus Subject Areas

Keywords

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