Details
| Original language | English |
|---|---|
| Pages (from-to) | 95-104 |
| Number of pages | 10 |
| Journal | Advanced functional materials |
| Volume | 24 |
| Issue number | 1 |
| Early online date | 21 Aug 2013 |
| Publication status | Published - 8 Jan 2014 |
Abstract
A versatile targeted etching strategy is developed for the large-scale synthesis of urchin-like mesoporous TiO 2 hollow spheres (UMTHS) with tunable particle size. Its key feature is the use of a low-temperature hydrothermal reaction of surface-fluorinated, amorphous, hydrous TiO 2 solid spheres (AHTSS) under the protection of a polyvinylpyrrolidone (PVP) coating. With the confinement of PVP and water penetration, the highly porous AHTSS are selectively etched and hollowed by fluoride without destroying their spherical morphology. Meanwhile TiO 2 hydrates are gradually crystallized and their growth is preferentially along anatase (101) planes, reconstructing an urchin-like shell consisting of numerous radially arranged single-crystal anatase nanothorns. Complex hollow structures, such as core-shell and yolk-shell structures, can also be easily synthesized via additional protection of the interior by pre-filling AHTSS with polyethylene glycol (PEG). The hollowing transformation is elucidated by the synergetic effect of etching, PVP coating, low hydrothermal reaction temperature, and the unique microstructure of AHTSS. The synthesized UMTHS with a large surface area of up to 128.6 m 2 g -1 show excellent light-harvesting properties and present superior performances in photocatalytic removal of gaseous nitric oxide (NO) and photoelectrochemical solar energy conversion as photoanodes for dye-sensitized mesoscopic solar cells.
Keywords
- dye-sensitized solar cells, hollow spheres, hydrothermal processes, photocatalysis, titanium dioxide
ASJC Scopus subject areas
- Chemistry(all)
- General Chemistry
- Materials Science(all)
- General Materials Science
- Physics and Astronomy(all)
- Condensed Matter Physics
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In: Advanced functional materials, Vol. 24, No. 1, 08.01.2014, p. 95-104.
Research output: Contribution to journal › Article › Research › peer review
}
TY - JOUR
T1 - Large-scale synthesis of urchin-like mesoporous TiO2 hollow spheres by targeted etching and their photoelectrochemical properties
AU - Pan, J.H.
AU - Wang, X.Z.
AU - Huang, Q.
AU - Shen, C.
AU - Koh, Z.Y.
AU - Wang, Q.
AU - Engel, A.
AU - Bahnemann, D.W.
N1 - Copyright: Copyright 2014 Elsevier B.V., All rights reserved.
PY - 2014/1/8
Y1 - 2014/1/8
N2 - A versatile targeted etching strategy is developed for the large-scale synthesis of urchin-like mesoporous TiO 2 hollow spheres (UMTHS) with tunable particle size. Its key feature is the use of a low-temperature hydrothermal reaction of surface-fluorinated, amorphous, hydrous TiO 2 solid spheres (AHTSS) under the protection of a polyvinylpyrrolidone (PVP) coating. With the confinement of PVP and water penetration, the highly porous AHTSS are selectively etched and hollowed by fluoride without destroying their spherical morphology. Meanwhile TiO 2 hydrates are gradually crystallized and their growth is preferentially along anatase (101) planes, reconstructing an urchin-like shell consisting of numerous radially arranged single-crystal anatase nanothorns. Complex hollow structures, such as core-shell and yolk-shell structures, can also be easily synthesized via additional protection of the interior by pre-filling AHTSS with polyethylene glycol (PEG). The hollowing transformation is elucidated by the synergetic effect of etching, PVP coating, low hydrothermal reaction temperature, and the unique microstructure of AHTSS. The synthesized UMTHS with a large surface area of up to 128.6 m 2 g -1 show excellent light-harvesting properties and present superior performances in photocatalytic removal of gaseous nitric oxide (NO) and photoelectrochemical solar energy conversion as photoanodes for dye-sensitized mesoscopic solar cells.
AB - A versatile targeted etching strategy is developed for the large-scale synthesis of urchin-like mesoporous TiO 2 hollow spheres (UMTHS) with tunable particle size. Its key feature is the use of a low-temperature hydrothermal reaction of surface-fluorinated, amorphous, hydrous TiO 2 solid spheres (AHTSS) under the protection of a polyvinylpyrrolidone (PVP) coating. With the confinement of PVP and water penetration, the highly porous AHTSS are selectively etched and hollowed by fluoride without destroying their spherical morphology. Meanwhile TiO 2 hydrates are gradually crystallized and their growth is preferentially along anatase (101) planes, reconstructing an urchin-like shell consisting of numerous radially arranged single-crystal anatase nanothorns. Complex hollow structures, such as core-shell and yolk-shell structures, can also be easily synthesized via additional protection of the interior by pre-filling AHTSS with polyethylene glycol (PEG). The hollowing transformation is elucidated by the synergetic effect of etching, PVP coating, low hydrothermal reaction temperature, and the unique microstructure of AHTSS. The synthesized UMTHS with a large surface area of up to 128.6 m 2 g -1 show excellent light-harvesting properties and present superior performances in photocatalytic removal of gaseous nitric oxide (NO) and photoelectrochemical solar energy conversion as photoanodes for dye-sensitized mesoscopic solar cells.
KW - dye-sensitized solar cells
KW - hollow spheres
KW - hydrothermal processes
KW - photocatalysis
KW - titanium dioxide
UR - http://www.scopus.com/inward/record.url?scp=84891557333&partnerID=8YFLogxK
U2 - 10.1002/adfm.201300946
DO - 10.1002/adfm.201300946
M3 - Article
VL - 24
SP - 95
EP - 104
JO - Advanced functional materials
JF - Advanced functional materials
SN - 1616-301X
IS - 1
ER -