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Syntheses, Li Insertion and Photoactivity of Mesoporous Crystalline TiO2

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Author(s)

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

School/Research organisations

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.

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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 Sep 2009

    Research areas

  • 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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