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Lee, Jae Sung
Eco-friendly Catalysis and Energy Lab
Research Interests
  • Photocatalytic water splitting, artificial photosynthesis, fuel cells, heterogeneous catalysis

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Formation of crystalline TiO2-xNx and its photocatalytic activity

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Title
Formation of crystalline TiO2-xNx and its photocatalytic activity
Other Titles
Formation of crystalline TiO2-xNx and its photocatalytic activity
Author
Jang, Jum SukKim, Hyun GyuJi, Sang MinBae, Sang WonJung, Jong HyeonShon, Byung HyunLee, Jae Sung
Keywords
TiO2; TiO2-xNx; visible light; activation energy; crystallization; grain growth
Issue Date
2006-04
Publisher
ACADEMIC PRESS INC ELSEVIER SCIENCE
Citation
JOURNAL OF SOLID STATE CHEMISTRY, v.179, no.4, pp.1067 - 1075
Abstract
Amorphous precursors to nitrogen-doped TiO2 (NTP) and pure TiO2 (ATP) powders were synthesized by hydrolytic synthesis and sol-gel method (SGM), respectively. Corresponding crystalline phases were obtained by thermally induced transformation of these amorphorus powders. From FT-IR and XPS data, it was concluded that a complex containing titanium and ammonia was formed in the precipitate stage while calcination drove weakly adsorbed ammonium species off the surface, decomposed ammonia bound Oil surface Or precipitated powder and led to substitution of nitrogen atom into the lattice of TiO2 during the crystallization. The activation energies required for grain growth in amorphous TiO2-xNx and TiO2 samples were determined to be 1.6 and 1.7 kJ/mol, respectively. Those reqUircd for the phase transformation from amorphous to crystalline TiO2-N-x(x) and TiO2 were determined to be 129 and 142kJ/mol respectively. A relatively low temperature was required for the phase transformation in NTP sample than in ATP sample. The fabricated N-doped TiO2 photocatalyst absorbed the visible light showing two absorption edges; one in UV range due to titanium oxide as the main edge and the other due to nitrogen doping as a small shoulder. TiO2-xNx photocatalyst demonstrated its photoactivity for photocurrent generation and decomposition of 2-propanol (IPA) Under visible light irradiation (lambda >= 420nm). (c) 2006 Elsevier Inc. All rights reserved
URI
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DOI
10.1016/j.jssc.2006.01.004
ISSN
0022-4596
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