Shigeto Hirai
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View article: Compositional Tuning in NaxAlB14 via Diffusion Control
Compositional Tuning in NaxAlB14 via Diffusion Control Open
A uniform Na distribution in NaxAlB14 was achieved using high-pressure diffusion control (HPDC), which promotes Na deintercalation through enhanced diffusion under high pressure, combined with post-annealing. NaxAlB14 with a non-stoichiome…
View article: Effects of coating layer homogeneity of cathode particles on lithium ion battery performance
Effects of coating layer homogeneity of cathode particles on lithium ion battery performance Open
Ensuring the stability of cathodes under high voltage (>4.3 V vs. Li/Li + ) necessitates particle-scale surface protection. Research varies on the optimal structure, and systematic studies on the impact of nanoscale coating coverage on cat…
View article: Synthesis of Cubic Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> Doped with Hf and W Using Metal Alkoxide Derived Sol-Gel Precursors
Synthesis of Cubic Li<sub>7</sub>La<sub>3</sub>Zr<sub>2</sub>O<sub>12</sub> Doped with Hf and W Using Metal Alkoxide Derived Sol-Gel Precursors Open
This study investigated the viability of Hf and/or W doping in Li7La3Zr2O12 (LLZO) through an alkoxide derived sol-gel process aimed at stabilizing the ion-conductive cubic garnet phase. Results revealed that Hf doping tends to favor the t…
View article: Effect of Dopants on Low-Temperature Preparation of Garnet-type Cubic Solid Electrolyte Powders
Effect of Dopants on Low-Temperature Preparation of Garnet-type Cubic Solid Electrolyte Powders Open
In this study, we focused on the low-temperature preparation of the typical Garnet-type cubic solid electrolyte powders of lithium lanthanum zirconate (LLZO) with new dopants. We chose the new dopants of Mg and Sr to stabilize the cubic ph…
View article: Coating on a primary particle by wet process to obtain core–shell structure and their application
Coating on a primary particle by wet process to obtain core–shell structure and their application Open
Synthesis of hybrid particles with core–shell structure by a coating on primary particles has attracted attention in various research fields. Therefore, various techniques have been proposed for coating particles using dry, wet, and vapor …
View article: SrTiO<sub>3</sub> nanocoating on a primary nanoparticle using metal alkoxide processing with chemical modification
SrTiO<sub>3</sub> nanocoating on a primary nanoparticle using metal alkoxide processing with chemical modification Open
A crystallized SrTiO3 (STO) nanocoating on a primary SiO2 nanoparticle was produced by metal alkoxide processing with chemical modification. The coated layer surface morphology and the coating amount were controlled by molecular design of …
View article: Preface
Preface Open
Synthesis and formation of functional ceramics and nanomaterials utilizing "Green Processing" with low energy consumption or else at low temperatures will be elemental technologies that open up applications in sustainable societies.Low-ene…
View article: Preparation of Barium Titanate Nanocoated Silica Nanoparticles by Chemical Solution Deposition
Preparation of Barium Titanate Nanocoated Silica Nanoparticles by Chemical Solution Deposition Open
After preparing SiO2-BaTiO3 particles with core–shell structure using metal alkoxide method, we attempted to prepare a homogeneous BaTiO3 coating layer by molecular design of a BaTiO3 precursor solution used in the coating process. The mol…
View article: Preparation and Phase Transition Temperature Control of VO<sub>2</sub> Nano-particles by Micro-emulsion Method from Molecular-designed Precursors
Preparation and Phase Transition Temperature Control of VO<sub>2</sub> Nano-particles by Micro-emulsion Method from Molecular-designed Precursors Open
Vanadium dioxide, VO2, undergoes the phase transition from monoclinic to tetragonal with property change from semiconductor to metal, respectively, at about 68°C. Metallic tetragonal structure reflects infrared light, and semiconducting mo…
View article: Slurry solvent content influence on electrode preparation, microstructure and performance
Slurry solvent content influence on electrode preparation, microstructure and performance Open
The electrode fabrication process, i.e., mixing the particles of active material and conductive additive in a binder solution, casting and drying, and calendering, play an important role in the electrode microstructure and electrochemical …
View article: Copolymerization effect on the synthesis of Li<sub>2</sub>FeSiO<sub>4</sub>/C nanocomposites by chemical solution deposition
Copolymerization effect on the synthesis of Li<sub>2</sub>FeSiO<sub>4</sub>/C nanocomposites by chemical solution deposition Open
Olivine-structured lithium iron silicate is one of the promising cathodes for the development of high energy lithium ion batteries. This article describes the synthesis of phase-pure mesoporous Li2FeSiO4/C nanocomposite particles by a modi…
View article: Development of core-shell nanomaterials for energy storage devices using chemical solution method
Development of core-shell nanomaterials for energy storage devices using chemical solution method Open
Professor Tomoya Ohno and Associate Professor Shigeto Hirai, Kitami Institute of Technology, Kitami, Japan, are collaborating on research on the composition and coating of catalysts used in rechargeable metal-air batteries. Ohno specialise…
View article: Highly active and stable surface structure for oxygen evolution reaction originating from balanced dissolution and strong connectivity in BaIrO<sub>3</sub> solid solutions
Highly active and stable surface structure for oxygen evolution reaction originating from balanced dissolution and strong connectivity in BaIrO<sub>3</sub> solid solutions Open
We have prevented lattice collapse and developed an OER catalyst with both high activity and stability by slightly increasing Ir-dissolution and balancing the elemental dissolution in BaIr 1− x Mn x O 3 for reconstructing the rigid catalyt…
View article: Growth and Characterization of ROBiS<sub>2</sub> High-Entropy Superconducting Single Crystals
Growth and Characterization of ROBiS<sub>2</sub> High-Entropy Superconducting Single Crystals Open
A series of high-entropy superconductors, ROBiS2 (R = La + Ce + Pr + Nd + Sm), have been successfully grown in the form of single crystals using CsCl flux. The obtained single crystals have a platelike shape with a size of 0.5-2.0 mm and a…
View article: ZrO<sub>2</sub> Nano-coating on Nano-particles by Liquid Phase Deposition
ZrO<sub>2</sub> Nano-coating on Nano-particles by Liquid Phase Deposition Open
Tetragonal ZrO2 was coated on the SiO2 nanoparticles by liquid phase deposition. In this study, the liquid phase deposition was carried out using the boric acid as the fluoride ion scavengers. The amount of the nano-coated ZrO2 was control…
View article: Effect of the Agglomeration Control of the Carbon and (Ca<sub>0.5</sub>,Sr<sub>0.5</sub>)RuO<sub>3</sub> Bi-functional Catalyst for Oxygen Evolution and Oxygen Reduction Reactions Particles on the Catalytic Activity
Effect of the Agglomeration Control of the Carbon and (Ca<sub>0.5</sub>,Sr<sub>0.5</sub>)RuO<sub>3</sub> Bi-functional Catalyst for Oxygen Evolution and Oxygen Reduction Reactions Particles on the Catalytic Activity Open
This paper shows the effect of the agglomeration control on the catalytic activity for oxygen evolution reaction (OER). In this study, (Ca0.5Sr0.5)RuO3 (CSRO) catalyst was selected as the bi-functional catalyst for OER and oxygen reduction…
View article: Superconducting transition temperatures in the electronic and magnetic phase diagrams of Sr<sub>2</sub>VFeAsO<sub>3−<i>δ</i> </sub>, a superconductor
Superconducting transition temperatures in the electronic and magnetic phase diagrams of Sr<sub>2</sub>VFeAsO<sub>3−<i>δ</i> </sub>, a superconductor Open
We elucidate the magnetic phases and superconducting (SC) transition temperatures (T c) in Sr2VFeAsO3-δ (21113V), an iron-based superconductor with a thick-blocking layer fabricated from a perovskite-related transition metal oxide. At low …
View article: Superconducting transition temperatures in electronic and magnetic phase diagram of a superconductor, Sr2VFeAsO3−δ
Superconducting transition temperatures in electronic and magnetic phase diagram of a superconductor, Sr2VFeAsO3−δ Open
We unveil magnetic phases and superconducting transition temperatures (Tc) in an iron-based superconductor with a thick-blocking layer of a perovskite-related transition metal oxide, Sr2VFeAsO3-delta (21113V). 21113V exhibits a superconduc…
View article: Non‐Fermi Liquids as Highly Active Oxygen Evolution Reaction Catalysts
Non‐Fermi Liquids as Highly Active Oxygen Evolution Reaction Catalysts Open
The oxygen evolution reaction (OER) plays a key role in emerging energy conversion technologies such as rechargeable metal‐air batteries, and direct solar water splitting. Herein, a remarkably low overpotential of ≈150 mV at 10 mA cm −2 di…