A5102809395- Magnetic confinement fusion research
- Particle accelerators and beam dynamics
- Plasma Diagnostics and Applications
- Ionosphere and magnetosphere dynamics
- Fusion materials and technologies
- Superconducting Materials and Applications
- Advanced Photocatalysis Techniques
- Electrocatalysts for Energy Conversion
- Laser-Plasma Interactions and Diagnostics
- Porphyrin and Phthalocyanine Chemistry
- X-ray Diffraction in Crystallography
- Crystallization and Solubility Studies
- Advanced battery technologies research
- Molecular Junctions and Nanostructures
- Solar and Space Plasma Dynamics
- TiO2 Photocatalysis and Solar Cells
- Copper-based nanomaterials and applications
- Transition Metal Oxide Nanomaterials
- Perovskite Materials and Applications
- Gas Sensing Nanomaterials and Sensors
- Electrochemical Analysis and Applications
- Semiconductor Quantum Structures and Devices
- Fatigue and fracture mechanics
- Polyoxometalates: Synthesis and Applications
- Crystallography and molecular interactions
ITER
2025
National Institute for Fusion Science
2014-2023
National Institutes of Natural Sciences
2006-2023
The Graduate University for Advanced Studies, SOKENDAI
2020-2023
Waseda University
2022-2023
Niigata University
2013-2021
Osaka University
2006-2020
Japan Science and Technology Agency
2006-2020
Faculty (United Kingdom)
2013-2019
Engineering (Italy)
2013-2019
Ag cocatalyst-loaded ALa(4)Ti(4)O(15) (A = Ca, Sr, and Ba) photocatalysts with 3.79-3.85 eV of band gaps layered perovskite structures showed activities for CO(2) reduction to form CO HCOOH by bubbling gas into the aqueous suspension photocatalyst powder without any sacrificial reagents. BaLa(4)Ti(4)O(15) was most active photocatalyst. A liquid-phase chemical method better than impregnation in situ photodeposition methods loading cocatalyst. The cocatalyst prepared loaded as fine particles...
Ru/SrTiO3:Rh photocatalyst powder for H2 evolution and varied powders O2 such as BiVO4 WO3 were suspended in acidified aqueous solutions, resulting showing activities water splitting into a stoichiometric ratio without an electron mediator under visible light irradiation. The photocatalytic dependent on pH. highest activity was obtained at pH 3.5. An optical microscope observation of the suspension containing 3.5 revealed that these aggregated with suitable contact. condition Rh doped SrTiO3...
IrO<sub>2</sub>-loaded SrTiO<sub>3</sub> doped with rhodium and antimony synthesized by a conventional solid-state reaction splits water under visible light simulated sunlight irradiation giving 0.1% of the apparent quantum yield at 420 nm.
The unprecedentedly low overpotential of 32 mV for oxygen evolution was attained by forming a unique motif NiS x nanowires stuffed into C 3 N 4 scabbards. With this system, electrocatalytic water splitting demonstrated at the lowest overall 72 mV.
We have constructed supramolecular solar cells composed of a series porphyrin–peptide oligomers [porphyrin functionalized α-polypeptides, P(H2P)n or P(ZnP)n (n = 1, 2, 4, 8, 16)], and fullerenes assembled on nanostructured SnO2 electrode using an electrophoretic deposition method. Remarkable enhancement in the photoelectrochemical performance as well broader photoresponse visible near-infrared regions is seen with increasing number porphyrin units α-polypeptide structures. Formation clusters...
A new transparent iridium oxide (IrOx) film on fluorine-doped tin (FTO) electrodes were achieved from a homogeneous precursor complex solution by employing facile spin-coating technique. The composition of the nanostructure and crystallinity IrOx is tunable simple annealing treatment compact layer, which responsible for their significantly different electrocatalytic performances water oxidation. Transmission electron microscopy (TEM) observations showed uniformly dispersed small...
KCaSrTa<sub>5</sub>O<sub>15</sub> with tungsten bronze structure and a band gap of 4.1 eV showed activities for water splitting CO<sub>2</sub> reduction NiO Ag cocatalysts, respectively.
Molecule-based preparation of lithium niobate nanowires was achieved by proper combination a niobium oxooxalate complex, structure-directing reagent, and source. Structural photophysical properties the obtained were characterized several microscopic spectroscopic techniques. The nanowire employed as photocatalyst for overall water splitting, H(2) or O(2) evolution reaction from an aqueous solution containing sacrificial reagent under UV light irradiation to show enhanced photocatalytic...
Plasma production in stellarators with ion cyclotron heating is complementary to the widely used electron (ECRH). The prospective light minority scenario developed and tried on Uragan-2M Large Helical Device (LHD) had been reexamined at LHD. distinctive feature of this attempt that parameters plasma produced are better than before comparable those by ECRH. This new possibility heating, if it becomes practical, motivates rethinking role stellarator machines.
In the first four years of LHD experiment, several encouraging results have emerged, most significant which is that MHD stability and good transport are compatible in inward shifted axis configuration. The observed energy confinement at this optimal configuration consistent with ISS95 scaling an enhancement factor 1.5. over smaller heliotron devices attributed to high edge temperature. We find plasma average beta 3% stable configuration, even though theoretical conditions Mercier modes...
Recent experimental results in the Large Helical Device have indicated that a large pressure gradient can be formed beyond stability criterion for Mercier (high-n) mode. While against an interchange mode is violated inward-shifted configuration due to enhancement of magnetic hill, neoclassical transport and confinement high-energy particle are, contrast, improved by this inward shift. Mitigation unfavourable effects MHD instability has led significant extension operational regime....
Multiple photosynthetic reaction centres have successfully been constructed using supramolecular complexes of zinc porphyrin dendrimers [D(ZnP)n: n = 4, 8, 16] with fulleropyrrolidine bearing a pyridine ligand (C60py). Efficient energy migration occurs completely between the ZnP units prior to electron transfer increasing generation attain an extremely long charge–separation lifetime.
Kleine Mesoporen sind effizienter: Ein mesoporöser Oxidhalbleiter (Wolfram(VI)-oxid) wurde bei 550 °C unter Verwendung eines einfachen einstufigen Verfahrens kristallisiert. Das hochkristalline mesoporöse WO3 hat eine extrem große Oberfläche, die zu einer gesteigerten photoelektrochemische Aktivität der Wasseroxidation (siehe Bild) im Vergleich einem WO3-Material mit zwischen den Partikeln führt.
Two pairs of high-frequency magnetic probes were installed in the Large Helical Device (LHD). During injection a perpendicular neutral beam, ion cyclotron emissions (ICEs) with fundamental frequency corresponding to at plasma edge detected, which are same type ICE as measured former spare range frequencies (ICRF) heating antennas. This was further investigated regard phase and intensity signals. Another found LHD, these ICEs synchronized bursts toroidicity induced Alfvén eigenmodes (TAE)...
Sodium niobates with nanowire morphology (NaNbO(3)-NW) were synthesized in a large scale by use of niobium oxooxalate complex as the starting material. This NaNbO(3)-NW showed definitely enhanced photocatalytic activity for H(2) or O(2) evolution presence sacrificial reagents and an overall water splitting under UV-light irradiation, compared bulky counterpart (NaNbO(3)-B). is first example that into proceeded on semiconductor photocatalyst.
Abstract NiO/NaNbO3 (BG: 3.5 eV) showed photocatalytic activity for water splitting into H2 and O2 under UV irradiation. When NaMO3 (M: Nb Ta) was codoped with iridium ions alkaline earth metal or lanthanum ions, a new visible-light absorption band observed in addition to the gap of host material. The codopants contributed maintaining charge balance forming fine crystals powder. These NaNbO3 NaTaO3 activities evolution from an aqueous solution containing sacrificial reagent visible light
Layered metal sulfides of CuGa2In3S8 with a 1.91-eV band gap and AgGa2In3S8 2.27-eV gave 15% apparent quantum yields at 560 nm 460 for H2 evolution from aqueous solutions containing K2SO3 Na2S as electron donors assistance Rh cocatalysts, respectively, Rh/CuGa2In3S8 responded to 680 the photocatalytic evolution.
The critical bottleneck for water splitting, which is important sustainable production of hydrogen, has remained in sluggish oxygen evolving reaction (OER) requiring insufficiently low overpotentials, η. We report a facile and versatile method the preparation loading-controllable metal oxide films adhered rigidly on electrode substrates, enabling effectual material hunting superior OER anodes. This allows us to discover ternary FeNiWOx film nickel foam (NF), attaining lowest overpotentials...
It was observed that the vacuum magnetic island produced by an external error field in large helical device shrank presence of plasma. This evidenced disappearance flat regions electron temperature profile obtained Thomson scattering. behavior depended on configuration which plasmas were produced.
Strategies for single-walled carbon nanotube (SWNT) separation are critical to developing nanotubes as useful nanoscale building blocks. Herein, diameter-selective dispersion of HiPco has been accomplished through noncovalent complexation the nondestructive with a flexible porphyrinic polypeptide bearing 16 porphyrin units [P(H2P)16] in DMF at 298 K. Supramolecular formation occurs wrapping peptidic backbone P(H2P)16 and π−π interaction between porphyrins extract large-diameter (ca. 1.3 nm)...
Internal transport barriers with respect to electron thermal (eITB) were observed in the large helical device, when cyclotron resonance heating (ECH) power was highly localized on centre of a plasma sustained by neutral beam injection. The eITB is characterized high central temperature 6–8 keV an extremely steep gradient, as 55 m−1 and low diffusivity within normalized average radius ρ≈0.3 well existence clear thresholds for ECH collisionality.
Nanometer-scale structures were fabricated using electric field enhanced oxidation an atomic force microscope with a conducting probe. The dependencies of thicknesses and widths oxide stripes on applied voltage time during which is applied, investigated. Also, the depths trenches, are silicon surface by removing stripes, mechanism discussed based these investigations.
Characteristics of MHD instabilities and their impacts on plasma confinement are studied in current free plasmas the Large Helical Device. Spontaneous L–H transition is often observed high beta close to 2% at low toroidal fields (Bt ⩽ 0.75 T). The stored energy starts rise rapidly just after accompanying clear electron density but quickly saturates due growth m = 2/n 3 mode (m n: poloidal numbers), rational surface which located edge barrier region, localized (ELM) like activities having...
Remarkable progress in the physical parameters of net-current free plasmas has been made Large Helical Device (LHD) since last Fusion Energy Conference Chengdu, 2006 (Motojima et al 2007 Nucl. 47 S668 ). The beta value reached 5% and a high-beta state beyond 4.5% from diamagnetic measurement maintained for longer than 100 times energy confinement time. density temperature regimes have also extended. central exceeded 1 × 10 21 m −3 due to formation an internal diffusion barrier . ion 5.2 keV...