Waseda University · Materials Science
Professor Nobuko Hanada's research lab specializes in materials chemistry and solid-state chemistry, with a primary focus on hydrogen storage materials and electrochemical hydrogen generation. The lab investigates metal hydrides, complex hydrides, and ammine-based systems to develop efficient, reversible, and safe materials for hydrogen storage and release. A key research direction involves enhancing the kinetics and thermodynamics of hydrogen sorption through nanostructuring, catalytic doping, and advanced characterization techniques such as XAS and XRD. The lab also explores liquid ammonia as a hydrogen carrier, employing electrochemical methods for high-purity hydrogen production at ambient conditions.
Figures are computed from collected data and may differ slightly.
We examined the catalytic effect of nanoparticle 3d-transition metals on hydrogen desorption (HD) properties of MgH(2) prepared by mechanical ball milling method. All the MgH(2) composites prepared by adding a small amount of nanoparticle Fe(nano), Co(nano), Ni(nano), and Cu(nano) metals and by ball milling for 2 h showed much better HD properties than the pure ball-milled MgH(2) itself. In particular, the 2 mol % Ni(nano)-doped MgH(2) composite prepared by soft milling for a short milling time
The thermal decomposition steps of Mg(BH4)2 were investigated under He flow and various hydrogen pressures up to 50 bar. In a He flow, the main decomposition of Mg(BH4)2 occurs between 250 and 410 °C until 12.2 mass% is lost, with three main peaks of hydrogen desorption. In the first decomposition step the crystalline phase of Mg(BH4)2 disappears while a small amount of Mg is detected in the XRD profile. However, the major part of the sample is in an amorphous state. After the second step, cryst
Hydrogen gas is generated by the electrolysis of liquid ammonia which has high hydrogen capacity of 17.8 mass%. The metal amides are used as supporting electrolytes to dissolve the amide ion in liquid ammonia. The results presented here indicate that liquid ammonia is promising as an energy medium for hydrogen storage and generation.
A valence state and a local structure of transition metals (Nb, V, and Ti) in MgH2 doped with metal oxides (Nb2O5, V2O5, and TiO2nano) by ball milling were examined by X-ray absorption spectroscopy (XAS). The main edge regions of the Nb, V, and Ti K-edges in the X-ray absorption near edge structure (XANES) profiles are located between 0 and +5 in the oxidation states. Since these spectra coincide with those of NbO, VO, and Ti2O3, respectively, the additives are reduced by MgH2 to the metal oxide
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