Takeshi Ohwaki

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To use solar irradiation or interior lighting efficiently, we sought a photocatalyst with high reactivity under visible light. Films and powders of TiO(2-x)N(x) have revealed an improvement over titanium dioxide (TiO2) under visible light (wavelength < 500 nanometers) in optical absorption and photocatalytic activity such as photodegradations of methylene(More)
We report the photooxidation of toluene over nitrogen doped TiO(2) (TiO(2-x)N(x)) under visible light irradiation. The photocatalytic oxidation of toluene in air over TiO(2-x)N(x) powders was studied using diffuse reflectance Fourier transform infrared spectroscopy (DRIFTS), gas chromatography (GC), ion chromatography (IC), and gas chromatography mass(More)
T. Ohwaki,1 D. Wortmann,2 H. Ishida,3 S. Blügel,2 and K. Terakura1,4 1Research Institute for Computational Sciences, AIST, Tsukuba, Ibaraki 306-8568, Japan 2Institut für Festkörperforschung, Forschungszentrum Jülich, 52425 Jülich, Germany 3CREST, JST, and Nihon University, Sakura-josui, Tokyo 156-8550, Japan 4Creative Research Initiative “Sousei,” Hokkaido(More)
The field-emission current from realistic metal surfaces is evaluated within the density-functional theory using the Landauer-Büttiker approach. The electronic density in the surface region and the potential barrier induced by the finite electric field are calculated self-consistently using a Green’s-function embedding scheme and the full-potential(More)
A new photocatalyst, known as nitrogen-doped TiO2 (TiO2-xNx), yielding high reactivity under visible light irradiation, together with high potential for mass-productivity, has been developed by using a highly time-efficient development technique that combines computational materials design with experimental syntheses. Under visible light irradiation,(More)
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