Preparation of TiO2-SiO2 aperiodic mesoporous materials with controllable formation of tetrahedrally coordinated Ti 4+ ions and their performance for photocatalytic hydrogen production

Chia Ming Wu, Rui Peng, Nada M. Dimitrijevic, Tijana Rajh, Ranjit T. Koodali

Research output: Contribution to journalArticlepeer-review

23 Scopus citations

Abstract

The efficiency of photocatalytic water splitting for TiO2 dispersed on four SiO2 aperiodic porous supports is discussed in this work. The four TiO2-SiO2 composite materials were prepared via a sol-gel method and then subjected to supercritical drying, natural drying, rotatory vapor drying, or hydrothermal synthesis and the materials were subsequently calcined under identical conditions. These synthetic strategies result in differences in textural properties (specific surface area, pore diameter etc.) and in the amount of tetrahedrally coordinated Ti 4+ ions. The TiO2-SiO2 materials were thoroughly characterized by powder X-ray diffraction (XRD), UV-Vis diffuse reflectance spectra (DRS), nitrogen adsorption studies, FT-IR spectroscopy, transmission electron microscopic (TEM) studies, and electron paramagnetic resonance (EPR) studies. The photocatalytic activity for hydrogen production is maximum when the amount of tetrahedrally coordinated Ti4+ ions is high. Thus, this work provides guidance towards the preparation of photoactive materials for generating hydrogen from water.

Original languageEnglish (US)
Pages (from-to)127-136
Number of pages10
JournalInternational Journal of Hydrogen Energy
Volume39
Issue number1
DOIs
StatePublished - Jan 2 2014
Externally publishedYes

Keywords

  • Aperiodic mesoporous material
  • Hydrogen production
  • Silicon dioxide
  • Tetrahedrally coordinated Ti ion
  • Titanium dioxide

ASJC Scopus subject areas

  • Renewable Energy, Sustainability and the Environment
  • Fuel Technology
  • Condensed Matter Physics
  • Energy Engineering and Power Technology

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