Syntheses, Li Insertion and Photoactivity of Mesoporous Crystalline TiO2

Wenbo Yue, Chamnan Randorn, Pierrot Sassou Attidekou, Zixue Su, John Thomas Sirr Irvine, Wuzong Zhou

Research output: Contribution to journalArticlepeer-review

128 Citations (Scopus)

Abstract

Ordered mesoporous rutile and anatase TiO2 samples are prepared using mesoporous silica SBA-15 as template and freshly synthesize titanium nitrate and titanium chloride solutions as precursors. The rutile material formed from the nitrate solution is monocrystalline and contains minimal amounts of Si with a Si:Ti ratio of 0.031(4), whereas the anatase material formed from the chloride solution comprises nanocrystals and contains a higher content of Si with a Si:Ti ratio of 0.18(3). It is found that control of temperature and selection of Ti-containing precursor play important roles in determining the crystal phase and crystallinity. A possible formation mechanism of porous crystalline TiO2 is suggested. Characterization of these porous materials is performed by XRD, HRTEM, and nitrogen adsorption/desorption. SBA-15-templated mesoporous rutile TiO2 exhibits higher Li ion insertion capability than KIT-6-templated TiO2 due to its larger surface area. Likewise mesoporous anatase TiO2:SiO2 composite has a better photoactivity than bulk TiO2 or TiO2-loaded SBA-15 for bleaching methylen blue.

Original languageEnglish
Pages (from-to)2826-2833
Number of pages8
JournalAdvanced Functional Materials
Volume19
Issue number17
Early online date24 Jul 2009
DOIs
Publication statusPublished - 9 Sept 2009

Keywords

  • NANOCRYSTALLINE RUTILE TIO2
  • POROUS SINGLE-CRYSTALS
  • SOLAR-CELL PERFORMANCE
  • PHOTOCATALYTIC ACTIVITY
  • METAL-OXIDES
  • NEGATIVE ELECTRODE
  • LITHIUM INSERTION
  • ROOM-TEMPERATURE
  • METHYLENE-BLUE
  • ANATASE TIO2

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