A5060913782- Advancements in Solid Oxide Fuel Cells
- Electronic and Structural Properties of Oxides
- Advanced Battery Materials and Technologies
- Catalytic Processes in Materials Science
- Magnetic and transport properties of perovskites and related materials
- Hydrogen Storage and Materials
- Advanced Condensed Matter Physics
- Fuel Cells and Related Materials
- ZnO doping and properties
- Transition Metal Oxide Nanomaterials
- Nuclear materials and radiation effects
- Solid-state spectroscopy and crystallography
- Semiconductor materials and devices
- Catalysis and Oxidation Reactions
- Thermal Expansion and Ionic Conductivity
- Advancements in Battery Materials
- Surface Roughness and Optical Measurements
- Advanced Photocatalysis Techniques
- Advanced Battery Technologies Research
- Gas Sensing Nanomaterials and Sensors
- Optical Coatings and Gratings
- Copper-based nanomaterials and applications
- Electrocatalysts for Energy Conversion
- X-ray Diffraction in Crystallography
- Metal Extraction and Bioleaching
Tohoku University
2016-2025
Graduate School USA
2020
Sendai University
2020
Nagoya University
1995
University of Alberta
1976
Abstract Most solid-state materials are composed of p-block anions, only in recent years the introduction hydride anions (1s 2 ) oxides (e.g., SrVO H, BaTi(O,H) 3 has allowed discovery various interesting properties. Here we exploit large polarizability (H – together with chalcogenide (Ch 2– to construct a family antiperovskites soft anionic sublattices. The M HCh (M = Li, Na) adopt ideal cubic structure except orthorhombic Na HS, despite variation sizes and Ch. This unconventional...
The Li
The distribution of protons and oxygen vacancies at room temperature different proton concentrations in 10 mol % Sc-doped BaZrO3 was investigated to clarify the influence concentration trapping caused by acceptor dopant. To enhance conductivity for practical use, it is essential understand this phenomenon known limit long-range transport protons. In study, 45Sc nuclear magnetic resonance (NMR) spectroscopy combined with thermogravimetric analysis (TGA) 1H NMR used elucidate protonic defects...
Abstract Layered bismuth oxyhalides with bilayered (Bi 2 O ) fluorite (FL) slabs are promising visible‐light photocatalysts because of their excellent stability and the ability to adjust band levels depending on layers combined. It is interesting manipulate Bi slab itself, but only trilayered FL blocks (e.g., 3 4 reported so far. Here, a structurally uncharacterized 12 17 Cl , which extensively studied as photocatalyst for variety reactions, has sextuple 6 8.5 block separated by shown....
It is necessary to elucidate the correlation between hydration properties and proton distributions in electrolytes as conductors allow for further improvements solid oxide fuel cells. In this study, of Sc-doped BaZrO3 (BZO) were investigated by means density functional theory calculations capable taking both local structural configurations levels into account. At a low level, BZOs gained negatively larger energy, that is, more exothermic reaction, incorporating an H2O molecule with unstable...
The effect of Ca doping on the Li-ion conductivity and phase stability rock-salt-type LiBH4 emerging under high pressures in range gigapascals has been investigated. In situ electrochemical measurements pressure were performed using a cubic-anvil-type apparatus. drastically enhanced ionic phase: undoped 5 mol %Ca-doped was 2.2 × 10-4 1.4 10-2 S·cm-1 4.0 GPa at 220 °C, respectively. activation volume LiBH4-5 %Ca(BH4)2, 3.2 cm3·mol-1, comparable to that other fast conductors, such as lithium...
Abstract CeO 2 –ZrO (CZ) solid solutions are widely utilized to control the oxygen partial pressure of automobile exhaust purification systems owing their high storage capacity (OSC) related valence change Ce ions upon reduction. Among various CZs, cation‐ordered κ‐Ce Zr O 8 shows highest OSC; however, ordering requires high‐temperature reduction above 1200 °C, causing grain growth and potentially compromising OSC. Recently, it has been reported that adding a small amount Fe 3 CZ (Zr/Ce = 1)...
The development of efficient and stable oxygen-reducing electrodes is challenging but vital for the production electrochemical cells. Composite composed mixed ionic-electronic conducting La1-xSrxCo1-yFeyO3-δ ionic doped CeO2 are considered promising components solid oxide fuel However, no consensus has been reached regarding reasons good electrode performance, inconsistent performance reported among various research groups. To mitigate difficulties related to analyzing composite electrodes,...
The correlation between the local structure and electric-field gradient at Sc site in ScO6 polyhedra Sc2O3, Ba3Sc4O9 BaSc2O4 was investigated by means of (45)Sc NMR spectroscopy DFT calculations. nucleus as determined experimentally calculations is compared using quadrupolar coupling constant, CQ, around chemically crystallographically distinct sites Sc-containing compounds. With CQ parameter, results obtained from calculation were good agreement with measurements. increase values standard...
Surface oxygen reduction reaction (ORR) rates at n-type oxide-based mixed ionic–electronic conducting (MIEC) solid oxide fuel cell (SOFC) cathodes can be expected to enhanced relative that p-type MIEC due the greater availability of electrons higher energies in band structure needed for charge transfer reaction. However, given difficulty achieving coexisting vacancies and conduction under oxidizing cathode conditions, no stable have been reported date. In this study, a predominantly...
The preparation of a transparent and smooth rutile-type TiO2 thin film without the use crystallographical effect substrate is challenge for advanced utilization in fields optics solid state ionics. Because acceptor doping leads to formation oxygen vacancies, this method has promise as new approach promote TiO2. Mg2+-doped films were prepared by pulsed laser deposition, effects Mg2+ on phases present, microstructure, optical properties, surface roughness investigated. Particular attention was...