Atsushi Kitada 교수

Monolithic conductive titanium oxides Ti(n)O(2n-1) (n = 2, 3, 4, 6) with well-defined macropores have been successfully prepared as a single phase, via reduction of a macroporous TiO(2) precursor monolith using zirconium getter. Despite substantial removal of oxide ions, all the reduced monoliths retain the macropore properties of the precursor, i.e., uniform pore size distribution and pore volume. Furthermore, compared to commercial porous Ebonex (shaped conductive Ti(n)O(2n-1)), the bulk densi

The electrodeposition of Mg metal from an ionic liquid–glyme mixture was investigated at room temperature. The mixture contains a glyme, a simple amide salt Mg(Tf2N)2 (Tf = SO2CF3), and a quaternary-ammonium Tf2N ionic liquid. Using the mixture bath, substantial cathodic electrodeposition of Mg at a large current density (∼10 mA cm−2) was observed, suggesting a change in coordination geometry around Mg2+ cation together with improved conductivity. By mixing diglyme, the conductivity increased by

We first report an AlCl3-containing diglyme electrolyte for room temperature Al electrodeposition, which have relatively low volatilities and low cost. With the molar ratio of AlCl3:diglyme = 1:5, the diglyme solution enabled deposition and dissolution of Al, which required relatively small overpotentials at room temperature. The deposits were not dendritic, indicating potential applications for Al plating or Al ion batteries.

We prepared less volatile and halide-free electrolytes for room temperature non-dendritic magnesium (Mg) electrodeposition by mixing a Mg2+-amide-containing ionic liquid (IL) with equimolar glyme (Mg2++IL : glyme = 1:1). Raman spectroscopy suggested that in the equimolar mixture most glyme molecules are coordinated to Mg2+ cations and/or IL cations, which is also supported by a single crystal X-ray diffraction study. The glyme-coordinated IL electrolytes showed sizable redox currents (order of m

Electrodeposition of iron (Fe) from an ethereal solution was investigated. The bath consisted of ferrous chloride (FeCl2), diglyme (G2), and aluminum chloride (AlCl3), in which iron species were estimated to be [Fe(G2)2]2+ complex cations. The effect of hydrogen gas evolution on the morphology of iron deposits was determined by comparing common aqueous electrolytes. An Fe thin film was fabricated using the FeCl2–G2–AlCl3 bath without the influence of hydrogen gas evolution, and the nucleation of

A quasi-two-dimensional S = 1/2 Heisenberg square-lattice antiferromagnet (CuCl)LaNb 2 O 7 is studied by specific heat and magnetic susceptibility measurements in external fields up to 14 T. The experimental results in low fields verify the absence of the order–disorder transition, as reported previously. By further application of magnetic fields, we obtain direct evidence for the phase transition, which can be interpreted as the Bose–Einstein condensation (BEC) of magnons. However, the critical

A concentrated aluminum chloride (AlCl₃)-diglyme (G2) electrolyte is used to prepare hard and corrosion-resistant aluminum (Al) electrodeposited films. The Al electrodeposits obtained from the electrolyte with an AlCl₃/G2 molar ratio <i>x</i> = 0.4 showed a void-free microstructure composed of spherical particles, in stark contrast to flake-like morphologies with micro-voids for lower <i>x</i>. Neutral complexes rarely exist in the <i>x</i> = 0.4 electrolyte, resulting in a

We demonstrate the synthesis and magnetic properties of a quasi-two-dimensional frustrated quantum spin system $(\text{CuCl})\text{La}{({\text{Nb}}_{1\ensuremath{-}x}{\text{Ta}}_{x})}_{2}{\text{O}}_{7}$. We observed persistence of the spin-singlet state in $(\text{CuCl}){\text{LaNb}}_{2}{\text{O}}_{7}$ up to $x\ensuremath{\sim}0.4$, accompanied by a slight reduction in the spin gap with increasing $x$. In spite of unaltered cell parameters and a preserved CuCl plane, $(\text{CuCl}){\text{LaTa}}_

We explored tin (Sn) alloys (Cu-Sn, In-Sn, Pb-Sn) as possible candidates for negative electrode materials of magnesium ion secondary batteries. Cyclic voltammograms revealed that In-Sn, Pb-Sn, and elemental Sn are active against Mg insertion and desertion at room temperature in a Grignard reagent, while Cu-Sn intermetallics are considerably inactive. Moreover, more than ten times of reversible peak currents were obtained for In-Sn and Pb-Sn alloys compared to pure Sn, suggesting the low-melting-

This was Paper 3475 presented at the Honolulu, Hawaii, Meeting of the Society, October 2–7, 2016.

We report the preparation and physical properties of reduced anatase TiO2-δ thin films obtained via a low-temperature (low-T) reduction using CaH2. The oxygen amounts were controlled in a wider range than ever reported. Some highly reduced anatase films showed resistivities as low as 10-3 Ω cm at room temperature, both in metallic and semiconducting states. The most conducting metallic sample has very high carrier concentration of 1.6×1021 cm-3, comparable with those of metal-doped anatase films

• Introduces electrodeposition of metals for battery current collectors. • Discusses properties of copper, aluminum, titanium, and stainless steel. • Focuses on electrolytic metal foils and their production processes. • Reviews research on metal electrodeposition baths. • Highlights challenges such as composition and inert anode utilization. The pursuit of reliable and sustainable energy storage solutions has driven continuous development of rechargeable lithium ion batteries (LIBs). While subst