A5086879911- Electrocatalysts for Energy Conversion
- Fuel Cells and Related Materials
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Heusler alloys: electronic and magnetic properties
- Catalytic Processes in Materials Science
- MXene and MAX Phase Materials
- Physics of Superconductivity and Magnetism
- Rare-earth and actinide compounds
- Crystal Structures and Properties
- Advanced battery technologies research
- Solid-state spectroscopy and crystallography
- Multiferroics and related materials
- Iron-based superconductors research
- Catalysis and Hydrodesulfurization Studies
- Nuclear Physics and Applications
- Magnetic properties of thin films
- Catalysis and Oxidation Reactions
- Magnetic Properties of Alloys
- Conducting polymers and applications
- Advancements in Solid Oxide Fuel Cells
- X-ray Spectroscopy and Fluorescence Analysis
- Supercapacitor Materials and Fabrication
- Nanomaterials for catalytic reactions
- Advanced Thermoelectric Materials and Devices
Kyushu University
2018-2019
Kyoto University
2005-2018
Shinshu University
2015-2018
Aoyama Gakuin University
2008-2017
Ōtani University
2014-2016
Hosei University
2003
University of Electro-Communications
2003
The Kitaev quantum spin liquid displays the fractionalization of spins into Majorana fermions. emergent edge current is predicted to manifest itself in form a finite thermal Hall effect, feature commonly discussed topological superconductors. Here we report on conductivity $\kappa_{xy}$ measurements $\alpha$-RuCl$_3$, candidate magnet with two-dimensional honeycomb lattice. In spin-liquid (Kitaev paramagnetic) state below temperature characterized by interaction $J_K/k_B \sim 80$ K, positive...
We report an electrical transport study in ${\mathrm{Ca}}_{2\ensuremath{-}x}{\mathrm{Sr}}_{x}{\mathrm{RuO}}_{4}$ single crystals at high magnetic fields ($B$). For $x=0.2$, the Hall constant ${R}_{xy}$ decreases sharply anisotropic metamagnetic transition, reaching its value for ${\mathrm{Sr}}_{2}{\mathrm{RuO}}_{4}$ fields. A sharp decrease $A$ coefficient of resistivity ${T}^{2}$ term and a change structure angular magnetoresistance oscillations $B$ rotating planes confirms reconstruction...
RuO2 nanosheets were studied as a promotor for the hydrogen oxidation reaction in presence of 300 ppm CO/H2. The current CO/H2 nanosheet modified PtRu/C catalyst (RuO2:Pt:Ru = 0.5:1:1 (molar ratio)) exhibited higher CO tolerance than Pt1Ru1/C and Pt2Ru3/C. Based on hydrodynamic voltammetry, chronoamperometry stripping addition is suggested to suppress adsorption surface, resulting an improvement tolerance.
PtRu/C catalyst were modified with one-atom-thick metallic Ru nanosheets, and the electrocatalytic activity as well long term durability studied for use an anode in polymer electrolyte fuel cells. Metallic nanosheet-PtRu/C composite catalysts obtained by hydrogen reduction of RuO2.1 nanosheet-modified PtRu/C. The oxidation reaction 300 ppm CO/H2 saturated 0.1 M HClO4 at 20 mV vs. RHE increased from 89 A (g-PtRu)−1 to 124 nanosheet catalyst. After accelerated test, was 1.8 times higher than...
The crystallographic and magnetic properties of the quaternary Heusler alloys Ru2Mn1−xVxGe were investigated. Although end members, Ru2MnGe (x = 0) Ru2VGe 1), are antiferromagnetic paramagnetic, ferromagnetism with Curie temperature over 200 K appeared at about x 0.3. saturation magnetization had a maximum (1.6μB/f.u.) 0.5. was explained by model which assumes preferential site occupation V atoms collapsing next nearest-neighbor Mn-Mn interactions V.
The spin-polarized electron momentum density distributions (magnetic Compton profiles) of Co2YAl (Y = Ti, V, Cr, and Fe) Heusler compounds have been measured using a magnetic scattering technique. experimental profiles decomposed into the itinerant localized 3d contributions. decomposition shows that number electrons is proportional to electrons, indicating strength indirect exchange interaction dominated by moment. This finding suggests part in profile used as scale can measure sp-d interaction.
Anomalous magnetic behavior was found in the polycrystalline Heusler alloy system Ru2Mn1−xFexGe. Samples of x=0 and 1.0 show no magnetoresistance (MR); however, anisotropic MR effect is observed for x=0.5 (MR ratios −4% +2% are under parallel perpendicular configurations applied field current, respectively). Moreover, measurement revealed that sample antiferromagnetic, whereas samples ferromagnetic with Curie temperatures 270 490 K, respectively. The saturation magnetization coercivity at 5...
The antiferromagnetism in Ru(2)MnGe can be suppressed by the substitution of V Mn and ferromagnetism appears. Synchrotron-based magnetic Compton scattering experiments are used order to investigates role 3d electrons indirect/direct exchange interactions for appearance ferromagnetism. A small spin moment itinerant electron part on profile indicates that metallic ferromagnet Ru(2)Mn(0.5)V(0.5)Ge has a weak indirect interaction between d-like sp-like (itinerant) electrons. This suggests is...
The magnetic properties of the polycrystalline Heusler compound Co <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> TiAl were investigated by classical experimental methods and Compton scattering experiment. X-ray diffraction profile at room temperature can be identified as phase L2 xmlns:xlink="http://www.w3.org/1999/xlink">1</sub> -type ordered structure. field dependence magnetization show that has typical soft ferromagnetic with T...
Catalyst layers (CLs) are designed using a specific ionomer in accordance with the required mass transport. Although is needed as protonic conductor, an excess thereof prevents oxygen diffusion. This work investigates effect of SiO2 coating and low amount on performance polymer electrolyte fuel cell (PEFC). The application to catalyst surface expected change its characteristics enhance dispersion ink. In terms their particle distribution, catalysts coated maintain higher dispersivity than...