Production of hydrogen absorption materials under the supercritical state

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This study is designed to improve the absorption and desorption properties of hydrogen in present hydrogen storage materials and to invent an out-of-the-box hydrogen storage materialby using nano-technology. In this study, the surface of the nano-porous material is a key point to improve the absorption and desorption properties of hydrogen and disperse the strain. The surface structure and its change during the hydrogen absorption and desorption process was investigated by the advantage of the neutron small angle scattering (SANS). In the ex- and in-situ SANS experiments on nano Ti0.31Cr0.33V0.36, the relationship between the surface fractal dimension Ds and the hydrogen content H/M was studied. This variation of Ds with H/M was explained by considering the volume expansion in the crystal structure. When we use D instead of H, the surface morphology became to be much different. The result allows us to get new information that the diffusion rate of H is faster than that of D in the surface of nano-particles.