Department of Mechanical Engineering, Faculty of Engineering, Kyushu University 本文へジャンプ


 Fuel Cell Vehivle:TOYOTA FCEV
Ti-based hydrogen absorbing alloy that
Prof. Akiba and Dr. Iba (TOYOTA) developed was used for on board hydrogen storage (October, 1996). The capacity of ~3mass% is still the largest among materials working at room temperature.

 Complex Hydrides for High-density Hydrogen Storage Materials
Complex hydrides such as Mg(BH4)2 have been attracting significant attention as a potential candidate for hydrogen storage materials, because of their high gravimetric hydrogen densities (6~15mass%). However, sluggish reaction rate and high reaction temperature degrade their potential for practical applications. Diffusion of constituent elements and recombination of chemical bonds during the de-/re-hydrogenation process are considered as the main factors causing these roadblocks according to our recent experimental studies.
In this group, our research activities focus on the clarification of diffusion behavior of constituent elements and change of chemical bonds accompanying the de-/re-hydrogenation of complex hydrides, aiming to build materials design principles, as well as developing advanced hydrogen storage materials.

 Comparison of hydrogen density among various storage technologies
liqiud- phase synthesis process of Mg(BH4)2                 Schematic illustration of formation process of
2H12]2- anion

 Development of Nove Light-Weight Hydrogen Storage Materials
The hydrogen storage materials for future application should have high hydrogen capacity, proper thermodynamic and kinetic properties. However, none of the current studied materials can meet these requirements.
We will try to develop high capacity materials by studying relationship between structure and hydrogen storage property, try to improve kinetics by nanotechnology and catalysis, and try to tailor thermodynamics by formation of novel structure and control of reaction pathway.
Desorption thermodynamics in MgH2does not change with catalyst and nanostructure (size>5nm).                            Reaction pathway is changed by using
Ti catalyzed nanostructure MgH2 in 2LiBH4+MgH2 composite.

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