Bicrystalline TiO2 with controllable anatase-brookite phase content for enhanced CO2 photoreduction to fuels

Huilei Zhao, Lianjun Liu, Jean Andino, Ying Li

Research output: Contribution to journalArticle

110 Citations (Scopus)

Abstract

Among the three naturally existing phases of TiO2, brookite is the least studied as a photocatalyst. In this study, single-phase anatase and brookite, and mixed-phase anatase-brookite TiO2 nanomaterials were synthesized through a hydrothermal method. The anatase-brookite phase content was controlled by adjusting the concentration of urea in the precursor solution. XRD, Raman spectroscopy, and high-resolution TEM were used to confirm the crystal structures. SEM and TEM analyses demonstrated that anatase TiO 2 were nearly spherical nanoparticles while brookite TiO2 were rod-shaped nanoparticles. UV-vis diffuse reflectance spectroscopy showed a blue shift in absorption spectra with increasing brookite content. The photocatalytic activities of the prepared bicrystalline TiO2 were evaluated for CO2 photoreduction in the presence of water vapor for production of solar fuels (CO and CH4). The activities were compared with those of pure anatase, pure brookite, and a commercial anatase-rutile TiO2 (P25). The results showed that bicrystalline anatase-brookite was generally more active than single-phase anatase, brookite, and P25. The bicrystalline mixture with a composition of 75% anatase and 25% brookite showed the highest photocatalytic activity, likely due to the enhanced interfacial charge transfer between anatase and brookite nanocrystals. In situ DRIFTS analysis showed that CO2 - and HCO3 - species were active reaction intermediates for CO2 photoreduction while the accumulation of non-reactive CO3 2- species on the TiO2 surface may be detrimental.

Original languageEnglish (US)
Pages (from-to)8209-8216
Number of pages8
JournalJournal of Materials Chemistry A
Volume1
Issue number28
DOIs
StatePublished - Jul 28 2013

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Titanium dioxide
titanium dioxide
Nanoparticles
Transmission electron microscopy
Reaction intermediates
Photocatalysts
Nanostructured materials
Urea
Nanocrystals
Water vapor
Raman spectroscopy
Charge transfer
Absorption spectra
Crystal structure
Spectroscopy
Scanning electron microscopy
Chemical analysis
Steam
Carbon Monoxide

ASJC Scopus subject areas

  • Chemistry(all)
  • Renewable Energy, Sustainability and the Environment
  • Materials Science(all)

Cite this

Bicrystalline TiO2 with controllable anatase-brookite phase content for enhanced CO2 photoreduction to fuels. / Zhao, Huilei; Liu, Lianjun; Andino, Jean; Li, Ying.

In: Journal of Materials Chemistry A, Vol. 1, No. 28, 28.07.2013, p. 8209-8216.

Research output: Contribution to journalArticle

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