In-situ and time-resolved measurement on hydrogen absorption/desorption processes of hydorgen absorbing alloys using synchrotron radiation X-rays

Machida, Akihiko; Watanuki, Tetsu; Katayama, Yoshinori; Kim, H.*; Sakaki, Koji*; Nakamura, Yumiko*

Hydrogen absorbing alloys are widely investigated as potential hydrogen storage materials for several applications including fuel cell vehicles as well as stationary energy storage system. In order to investigate the structural changes during the hydrogen absorption/desorption processes, we have developed an in-situ X-ray diffraction measurement setup at the Japan Atomic Energy Agency Beamline BL22XU in SPring-8. The in-situ X-ray diffraction measurement has been performed for the several hydrigen absorbing alloys under equilibrium and non-equilibrium pressure of hydrogen gas. In addition, by using a large area detector and high energy X-ray about 70 keV, we are capable of performing X-ray total scattering experiments to obtain the atomic pair distribution function. In this presentation, we will intorduce our measurement setup and show some preliminary results.