A5040287496- Advancements in Battery Materials
- Ferroelectric and Piezoelectric Materials
- Advanced Battery Materials and Technologies
- Multiferroics and related materials
- X-ray Diffraction in Crystallography
- Electrical and Thermal Properties of Materials
- Magnesium Oxide Properties and Applications
- Magnetic and transport properties of perovskites and related materials
- Extraction and Separation Processes
- Magnetic Properties and Synthesis of Ferrites
- Electron and X-Ray Spectroscopy Techniques
- Advancements in Solid Oxide Fuel Cells
- Microwave Dielectric Ceramics Synthesis
- Catalytic Processes in Materials Science
- Supercapacitor Materials and Fabrication
- Electronic and Structural Properties of Oxides
- Inorganic Chemistry and Materials
- Layered Double Hydroxides Synthesis and Applications
- Advanced Battery Technologies Research
- Gas Sensing Nanomaterials and Sensors
- Chemical Synthesis and Characterization
- Transition Metal Oxide Nanomaterials
- Acoustic Wave Resonator Technologies
- MXene and MAX Phase Materials
- Thermal and Kinetic Analysis
Tokyo University of Science
2015-2024
National Institute of Advanced Industrial Science and Technology
2012-2024
Shimane University
2023
Tokyo Medical and Dental University
2022
Teikyo University of Science
2014-2017
Mie University
2017
Central Research Institute of Electric Power Industry
2017
Nagoya University
2017
Noda Institute for Scientific Research
2015
University of Connecticut
2015
We report a simple room-temperature synthesis route for increasing the reactivity of TiO2 photocatalyst using solution plasma process (SPP). Hydrogen radicals generated from SPP chamber interact with feedstock, transforming its crystalline phase and introducing oxygen vacancy defects. In this work, we examined pure anatase as model feedstock because photocatalytic attributes well-characterized properties. After treatment, was transformed to an anatase/brookite heterocrystalline vacancies....
PAW is effective in inactivating microorganisms. We have measured a local pH to reveal the mechanism of algicidal effect PAW. This because protons pumped from cell generate peroxynitrite around an acidic region.
This study presents a comprehensive assessment of the temperature‐dependent electrochemical performance LiNbO₃‐coated lithium‐rich manganese‐based oxide (LRMO) cathodes in all‐solid‐state batteries (ASSBs). The effects temperature and activation on LRMO were systematically investigated through characterization X‐ray diffraction absorption near‐edge structure analyses. significantly improve electronic conductivity by facilitating lithium intercalation within sulfide‐based solid electrolyte...
The atomic structure of a spinel-type MgCo<sub>2</sub>O<sub>4</sub> nanoparticle was investigated by the reverse Monte Carlo modelling using X-ray and neutron total scattering data.
The effects of the annealing process on crystal and local structures doped zirconia were investigated by Rietveld refinements synchrotron X-ray neutron diffraction, maximum entropy method (MEM), absorption spectroscopy (XAS), first-principles calculations (FPCs). This study reveals that sintered annealed (Zr0.85Y0.15)O2−δ (8YSZ) (Zr0.81Sc0.18Ce0.01)O2−δ (10SSZ) are cubic with space group Fm3̅m have large atomic displacement parameters (Uiso). amounts tetragonal other phases less than 0.2 mol...
Research has recently been focused on high-performance next-generation batteries to replace secondary due capacity limitations and safety concerns. The Mg battery is one candidate realize high energy density storage for practical applications. Ni Co typically exhibit desirable electrochemical characteristics; therefore, we have attempted synthesize new rock-salt compositions, MgxNiyCozO2 (x + y z ≤ 2.0), as cathode materials rechargeable batteries, investigated their crystal structures...
The ionic–electronic conduction of (La<sub>1−x</sub>Sr<sub>x</sub>)CoO<sub>3−δ</sub> is studied by experiments and calculations. spin state transition occurred concomitantly with the metal–insulator transition.
Abstract The stable structure of the spinels MgCo2O4 and MgCo1.5Mn0.5O4, as Mg secondary battery cathode materials, was investigated by first-principles calculations. calculated structures were compared with crystal obtained quantum beam measurements. effect on electronic substitution Mn in examined. Pair distribution function fitting normal spinel MgCo1.5Mn0.5O4 gave a better agreement experiments than that MgCo2O4. It found Mg/Co cation mixing decreased Mn, for Rietveld analysis...
In this work, boron doped diamond (BDD) films were deposited onto a silicon substrate using the in-liquid microwave plasma chemical vapor deposition (IL-MPCVD) method. During synthesis of BDD films, effect solvent, pressure, power and distance between antenna on growth rate was studied. Pressure varied from 20 to 80 kPa at interval kPa, 500 600 W 50 1 1.5 mm. These different conditions resulted in formation both nanocrystalline microcrystalline films. Synthesized characterized by Raman...
To improve the phase noise of a ring voltage-controlled oscillator (VCO), we describe two 1/ f-noise reduction techniques, which are switched bias circuit (SBC) and current source (CS) operating in triode region. The VCO utilizing techniques was fabricated by 0.18-µm complementary metal–oxide–semiconductor (CMOS) technology, it achieved 1 GHz oscillation, -68 dBc/Hz at 100 kHz offset, 710 µW power dissipation using V supply. proposed SBC CS region reduced 3 7 dB, respectively. A phase-locked...
MgCo2−xMnxO4 (x = 0.1, 0.2, 0.4) was prepared using an inverse co-precipitation method. The primary product determined to have a spinel structure (space group Fd3m) based on powder X-ray diffraction data. A Rietveld analysis of synchrotron data showed that Mg, Co and Mn in this material were distributed disordered manner, meaning cation mixing had occurred. Charge-discharge testing MgCo2−xMnxO4/AZ31 cells with Ag reference electrodes demonstrated discharge capacity 80 mAhg−1 high coulombic...
Chemically delithiated Li0.13Mn0.54Ni0.13Co0.13O2−δ was synthesized by the reaction of Li1.2Mn0.54Ni0.13Co0.13O2 with NO2BF4. Charge and discharge tests for Li0.13Mn0.54Ni0.13Co0.13O2−δ/Mg alloy cell showed high capacity 273 mA h g−1. Since XANES spectra a shift toward lower energy in transition metals after discharge, reduction main phase confirmed accompanied Mg intercalation. Rietveld analysis revealed that mixed phases layered rock-salt Li2MnO3 types were generated insertion during process.
The chemical compositions of cavansite and pentagonite, in which H2O contents vanadium (in an unknown oxidation state) are present, were determined by thermogravimetry-differential thermal analysis (TG-DTA), electron spin resonance (ESR), microprobe (EMPA). Furthermore, the mechanism dehydration minerals presence hydrous species such as H2O, H3O+, OH- aforementioned have been investigated TG-DTA, high-temperature X-ray diffraction (HT-XRPD) analysis, Fourier-transform infrared (FTIR)...
The average and local crystal structures, the electronic structure of 0.4Li2MnO3-0.6LiMn1/3Ni1/3Co1/3O2 were investigated using a combination pair distribution function (PDF) analysis first-principles calculations. A Rietveld showed that sample had Li2MnO3-type (space group: C2/m) Ni Co existed at two sites, 4g 2b, in transition metal layer. Based on maximum entropy method synchrotron X-ray diffraction data, calculations, it was determined covalencies between 2b 8j sites layer, 2c lithium...
In this work, we focus on Mg-Fe-O and Mg-Ni-O with Mg-rich compositions as positive-electrode materials for magnesium rechargeable batteries, prepare them by a thermal decomposition of precipitates obtained solution method. It is indicated from X-ray diffraction patterns that the samples have spinel rocksalt structures, respectively. absorption near edge structures indicate Fe Ni are trivalent divalent, respectively, in oxides. From charge/discharge cycle test, it demonstrated shows higher...
MgMn2O4 with a tetragonal spinel structure shows promise as positive-electrode material in magnesium rechargeable batteries (MRBs), which have drawn considerable attention post lithium-ion batteries. However, the currently suffers from poor cycle performance. In this study, we attempt to improve performance of via Zr modification its particle surface. X-ray photoelectron spectroscopy and energy-dispersive demonstrate that surface is successfully performed by immersing powder into...