Статья

LaTiO<sub>2</sub>N as a Visible-Light (≤600 nm)-Driven Photocatalyst (2)

Asako KasaharaChemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Department of Chemistry and Bioscience, Kurashiki University of Science and the Arts, Nishinoura 2640, Tsurajima, Kurashiki 712-8505, Japan, and Core Research for Evolutional Science and Technology, Japan Science and Technology Co. (CREST, JST), 2-1-13 Higashi-Ueno, Taito-ku 110-0015, JapanKohta NukumizuChemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Department of Chemistry and Bioscience, Kurashiki University of Science and the Arts, Nishinoura 2640, Tsurajima, Kurashiki 712-8505, Japan, and Core Research for Evolutional Science and Technology, Japan Science and Technology Co. (CREST, JST), 2-1-13 Higashi-Ueno, Taito-ku 110-0015, JapanTsuyoshi TakataChemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Department of Chemistry and Bioscience, Kurashiki University of Science and the Arts, Nishinoura 2640, Tsurajima, Kurashiki 712-8505, Japan, and Core Research for Evolutional Science and Technology, Japan Science and Technology Co. (CREST, JST), 2-1-13 Higashi-Ueno, Taito-ku 110-0015, JapanJunko N. KondoChemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Department of Chemistry and Bioscience, Kurashiki University of Science and the Arts, Nishinoura 2640, Tsurajima, Kurashiki 712-8505, Japan, and Core Research for Evolutional Science and Technology, Japan Science and Technology Co. (CREST, JST), 2-1-13 Higashi-Ueno, Taito-ku 110-0015, JapanMasahiko HaraChemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Department of Chemistry and Bioscience, Kurashiki University of Science and the Arts, Nishinoura 2640, Tsurajima, Kurashiki 712-8505, Japan, and Core Research for Evolutional Science and Technology, Japan Science and Technology Co. (CREST, JST), 2-1-13 Higashi-Ueno, Taito-ku 110-0015, JapanHisayoshi KobayashiChemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Department of Chemistry and Bioscience, Kurashiki University of Science and the Arts, Nishinoura 2640, Tsurajima, Kurashiki 712-8505, Japan, and Core Research for Evolutional Science and Technology, Japan Science and Technology Co. (CREST, JST), 2-1-13 Higashi-Ueno, Taito-ku 110-0015, JapanKazunari DomenChemical Resources Laboratory, Tokyo Institute of Technology, 4259 Nagatsuta, Midori-ku, Yokohama 226-8503, Japan, Department of Chemistry and Bioscience, Kurashiki University of Science and the Arts, Nishinoura 2640, Tsurajima, Kurashiki 712-8505, Japan, and Core Research for Evolutional Science and Technology, Japan Science and Technology Co. (CREST, JST), 2-1-13 Higashi-Ueno, Taito-ku 110-0015, Japan

2002en

ABI

Аннотация

LaTiO2N, a Ti-based oxynitride, was studied as a visible-light (420−600 nm)-driven photocatalyst. DFT calculation for LaTiO2N indicated that the top of the valence band consists predominantly of N 2p orbitals with a small contribution by O 2p orbitals, while the bottom of the conduction band is made up entirely of empty Ti 3d orbitals. LaTiO2N was synthesized from a La2Ti2O7 precursor at 1123 K under NH3 flow. The relationship between the preparation condition and the photocatalytic activities of H+ reduction to H2 and H2O oxidation to O2 was examined. It was found that the photocatalytic activity for O2 evolution increased with nitridation time, reaching a maximum at 72 h. Further treatment beyond 72 h lowered the rate of O2 evolution. The rate of H2 evolution was almost independent of nitridation time. The relationship between nitridation time and the rate of O2 evolution is discussed on the basis of X-ray photoelectron spectroscopy (XPS) analyses.

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Идентификаторы

DOI: 10.1021/jp026767q

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