A5087849116- Advanced Photocatalysis Techniques
- TiO2 Photocatalysis and Solar Cells
- Perovskite Materials and Applications
- Copper-based nanomaterials and applications
- Electronic and Structural Properties of Oxides
- Polyoxometalates: Synthesis and Applications
- Catalytic Processes in Materials Science
- Gas Sensing Nanomaterials and Sensors
- Electrocatalysts for Energy Conversion
- Advanced Condensed Matter Physics
- Advanced Nanomaterials in Catalysis
- Ammonia Synthesis and Nitrogen Reduction
- Layered Double Hydroxides Synthesis and Applications
- Covalent Organic Framework Applications
- CO2 Reduction Techniques and Catalysts
- Inorganic Chemistry and Materials
- Multiferroics and related materials
- Ferroelectric and Piezoelectric Materials
- Quantum Dots Synthesis And Properties
- Nuclear materials and radiation effects
- Crystallization and Solubility Studies
- Coal and Coke Industries Research
- Luminescence Properties of Advanced Materials
- Transition Metal Oxide Nanomaterials
- X-ray Diffraction in Crystallography
Kyoto University
2016-2025
Carbon Engineering (Canada)
2025
Kyoto Katsura Hospital
2017-2023
University of Miyazaki
2023
Japan Science and Technology Agency
2011-2022
Graduate School USA
2008-2021
National Institute of Advanced Industrial Science and Technology
2001-2021
Shinshu University
2014-2021
Centre de Recherche en Économie et Statistique
2017-2019
Centre for Research in Engineering Surface Technology
2015-2019
Tungsten oxide loaded with nanoparticulate platinum is demonstrated to exhibit high activity for the decomposition of organic compounds both in liquid and gas phases; was almost comparable that TiO2 under UV light irradiation much higher than nitrogen-doped visible irradiation.
A two-step photocatalytic water splitting (Z-scheme) system consisting of a modified ZrO2/TaON species (H2 evolution photocatalyst), an O2 photocatalyst, and reversible donor/acceptor pair (i.e., redox mediator) was investigated. Among the photocatalysts mediators examined, Pt-loaded WO3 (Pt/WO3) IO3−/I− were respectively found to be most active components. Combining these two components with achieved stoichiometric into H2 under visible light, achieving apparent quantum yield 6.3%...
Fifteen commercial titania (titanium(IV) oxide; TiO2) powders were modified with gold by photodeposition to prepare photocatalysts that work under irradiation light in the visible range (vis). The gold-modified (Au/TiO2) characterized diffuse reflectance spectroscopy (DRS), field-emission scanning electron microscopy (FE-SEM), transmission (STEM) and X-ray powder diffraction (XRD). It was shown all tested could absorb an absorption maximum at localized surface plasmon resonance (LSPR)...
The photoelectrochemical properties of porous BiVO4 thin-film electrodes on conducting glass for H2 production from water under visible light were investigated. films prepared by the metal-organic decomposition method, and particles 90-150 nm in diameter. Under visible-light irradiation, O2 evolved a stoichiometric ratio (H2/O2 = 2) an aqueous solution Na2SO4 with external bias. photocurrent increased addition methanol. band structure was investigated open-circuit potential, flat-band X-ray...
The stoichiometric splitting of water into H2 and O2 (H2/O2 = 2) under visible light irradiation (lambda > 420 nm) took place for the first time using a mixture Pt-WO3 Pt-SrTiO3 (Cr-Ta-doped) photocatalysts an IO3-/I- shuttle redox mediator.
The porous oxynitride TaON film electrode prepared on conducting glass (FTO) showed significantly high quantum efficiency (IPCE = ca. 76% at 400 nm 0.6 V vs Ag/AgCl) in an aqueous Na2SO4 solution, after loading of IrO2·nH2O nanoparticles as a cocatalyst for water oxidation. Overall splitting into H2 and O2 under visible light was demonstrated using IrO2·nH2O-loaded photoanode combined with Pt externally applied bias (0.6−1 V).
Action spectrum analyses showed that visible light-induced oxidation of 2-propanol by aerated gold-modified titanium(IV) oxide (titania) suspensions is initiated excitation gold surface plasmon, and polychromatic irradiation experiments revealed the photocatalytic reaction rate depends strongly on properties titania, such as particle size, area crystalline form (anatase or rutile) deposits, size shape.
Mixed anion compounds are expected to be a photocatalyst for visible light-induced water splitting, but the available materials have been almost limited oxynitrides. Here, we show that an oxychrolide Bi4NbO8Cl, single layer Sillen–Aurivillius perovskite, is stable and efficient O2-evolving under light, enabling Z-scheme overall splitting by coupling with H2-evolving (Rh-doped SrTiO3). It found valence band maximum of Bi4NbO8Cl unusually high owing highly dispersive O-2p orbitals (not Cl-3p...
Highly stable photoelectrochemical water splitting is demonstrated for the first time on a tantalum oxynitride (TaON) photoanode under visible light irradiation. dispersed CoO(x) nanoparticles TaON efficiently scavenge photogenerated holes and effectively suppress self-oxidative deactivation of surface, resulting in photocurrent. The use highly cocatalyst together with phosphate solutions significantly increased photocurrent due to formation cobalt/phosphate phase. This enabled us stably...
Efficient TaON and Ta3N5 photoanodes for water splitting were fabricated on conducting glass support (FTO). A necking treatment, which forms effective contacts between (or Ta3N5) particles, afforded a significant increase in the photocurrent. Furthermore, loading of IrO2·nH2O nanoparticles as cocatalyst oxidation improved photocurrent photoanode. The incident photon to charge carrier efficiencies (IPCEs) calculated be ca. 76% at 400 nm 31% 500 nm, respectively, 1.15 V vs. reversible hydrogen...
Three mixed tantalum oxynitrides, ATaO2N (A = Ca, Sr, Ba), prepared by heating amorphous A2Ta2O7 under NH3, are applied in a two-step photoexcitation water-splitting system as photocatalyst for H2 evolution. Platinum-loaded CaTaO2N and BaTaO2N demonstrated to be active evolution the presence of methanol or I− an electron donor, whereas SrTaO2N is unable produce stably due self-oxidative decomposition accompanied N2 production. The combination Pt−CaTaO2N Pt−BaTaO2N with Pt−WO3 achieves...
Photoelectrochemical CO2 reduction activity of a hybrid photocathode, based on Ru(II)-Re(I) supramolecular metal complex photocatalyst immobilized NiO electrode (NiO-RuRe), was confirmed in an aqueous electrolyte solution. Under half-reaction conditions, the NiO-RuRe photocathode generated CO with high selectivity, and its turnover number for formation reached 32 amount RuRe. A photoelectrochemical cell comprising CoOx/TaON photoanode showed visible-light-driven using water as reductant to...
Water splitting into H2 and O2 under visible light was achieved using simple organic dyes such as coumarin carbazole photosensitizers on an n-type semiconductor for evolution, a tungsten(VI) oxide (WO3) photocatalyst triiodide/iodide (I3(-)/I(-)) redox couple shuttle electron mediator between them. The results electrochemical measurements revealed that the oxidized states of dye molecules having oligothiophene moiety (two or more thiophene rings) in their structures are relatively stable...
Strontium niobium oxynitride (SrNbO(2)N) particles were coated on fluorine-doped tin oxide (FTO) glass and examined as a photoelectrode for water splitting under visible light in neutral aqueous solution (Na(2)SO(4), pH ≈ 6). SrNbO(2)N, which has band gap of ca. 1.8 eV, acted an n-type semiconductor generated anodic photocurrent assignable to oxidation upon irradiation with visible-light photons wavelengths up 700 nm, even without externally applied potential. Under (λ > 420 nm) potential...
Photoanodes made from BaTaO2N that can harvest visible light up to 660 nm wavelength were fabricated on Ti substrates for achieving efficient water splitting. Both pre-treatment of particles with an H2 stream and post-necking treatment TaCl5 effectively increased the photocurrent due decreased electrical resistance in porous photoanode. A combination pre-loading CoO(x) post-loading RhO(x) significantly improved both stability under irradiation, along obvious negative shift (ca. 300 mV) onset...
A layered oxychloride Bi4NbO8Cl is a visible-light responsive catalyst for water splitting, with its remarkable stability ascribed to the highly dispersive O-2p orbitals in valence band, origin of which, however, remains unclear. Here, we systematically investigate four series bismuth oxyhalides, BiOX (X = Cl, Br, I), Bi4NbO8X Br), Bi2GdO4X and SrBiO2X found that Madelung site potentials anions capture essential features band structures these materials. The oxide anion fluorite-like blocks...
Visible-light-driven hydrogen (H2) production from water is a promising strategy to convert and store solar energy as chemical energy. Covalent organic frameworks (COFs) are front runners among different classes of photocatalysts. The photocatalytic activity COFs depends on numerous factors such the electronic band gap, crystallinity, surface area, exciton migration, stability transient species, charge separation transport, etc. However, it challenging fine tune all these simultaneously...
Post-transition metal cations with a lone pair (ns2np0) electronic configuration such as Pb2+ and Bi3+ are important components of materials for solar-to-energy conversion. As in molecules like NH3, the is often stereochemically active crystals, associated distorted coordination environments these cations. In present study, we demonstrate that suppressed stereochemical activity can be used tool to enhance visible light absorption. Based on an orbital interaction model, predict...
To achieve efficacious photocatalytic overall water splitting, surface modification of photocatalysts with proficient cocatalysts for hydrogen evolution reaction (HER) is imperative. NiBHT, a conductive two-dimensional coordination polymer (2D CP), or 2D metal–organic framework MOF), endowed remarkable chemical stability and HER selectivity, emerged as promising candidate an cocatalyst. However, the bulky morphology NiBHT hampered its performance. Here, we demonstrate strategy to miniaturize...