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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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Photocatalytic hydrogen production from water-methanol mixtures using N-doped Sr2Nb2O7 under visible light irradiation: effects of catalyst structure

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Title
Photocatalytic hydrogen production from water-methanol mixtures using N-doped Sr2Nb2O7 under visible light irradiation: effects of catalyst structure
Other Titles
Photocatalytic hydrogen production from water-methanol mixtures using N-doped Sr2Nb2O7 under visible light irradiation: effects of catalyst structure
Author
Ji, Sang MinBorse, Pramod H.Kim, Hyun GyuHwang, Dong WonJang, Jum SukBae, Sang WonLee, Jae Sung
Keywords
TITANIUM-DIOXIDE; TANTALATE PHOTOCATALYSTS; OXIDE PHOTOCATALYSTS; PEROVSKITE STRUCTURE; LIQUID WATER; DECOMPOSITION; LA2TI2O7; ION; H-2; PHOTODECOMPOSITION
Issue Date
2005-03
Publisher
ROYAL SOC CHEMISTRY
Citation
PHYSICAL CHEMISTRY CHEMICAL PHYSICS, v.7, no.6, pp.1315 - 1321
Abstract
Nitrogen-doped perovskite type materials, Sr2Nb2O7-xNx (0, 1.5 < x < 2.8), have been studied as visible light-active photocatalysts for hydrogen production from methanol - water mixtures. Nitrogen doping in Sr2Nb2O7 red-shifted the light absorption edge into the visible light range and induced visible light photocatalytic activity. There existed an optimum amount of nitrogen doping that showed the maximum rate of hydrogen production. Among the potential variables that might cause this activity variation, the crystal structure appeared to be the most important. Thus, as the extent of N-doping increased, the original orthorhombic structure of the layered perovskite was transformed into an unlayered cubic oxynitride structure. The most active catalytic phase was an intermediate phase still maintaining the original layered perovskite structure, but with a part of its oxygen replaced by nitrogen and oxygen vacancy to adjust the charge difference between oxygen and doped nitrogen. These experimental observations were explained by density functional theory calculations. Thus, in Sr2Nb2O7-xNx, N2p orbital was the main contributor to the top of the valence band, causing band gap narrowing while the bottom of conduction band due to Nb4d orbital remained almost unchanged
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DOI
10.1039/b417052k
ISSN
1463-9076
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ECHE_Journal Papers
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