22 September 2015 X-ray characterization of short-pulse laser illuminated hydrogen storage alloys having very high performance
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Hydrogen storage alloys become more and more important in the fields of electric energy production and stage and automobiles such as Ni-MH batteries. The vacancies introduced in hydrogen absorption alloy by charged particle beams were found to be positive effect on the increase in the initial hydrogen absorption reaction rate in the previous study. The initial reaction rates of hydrogen absorption and desorption of the alloy are one of the important performances to be improved. Here, we report on the characterization of the hydrogen absorption reaction rate directly illuminated by a femtosecond and nanosecond lasers instead of particle beam machines. A laser illuminates the whole surface sequentially on a tip of a few cm square LaNi4.6Al0.4 alloy resulting in significant improvement in the hydrogen absorption reaction rate. For characterization of the surface layer, we perform an x-ray diffraction experiment using a monochromatized intense x-ray beam from SPring-8 synchrotoron machine.
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Hiroyuki Daido, Hiroyuki Daido, Hiroshi Abe, Hiroshi Abe, Takahisa Shobu, Takahisa Shobu, Takuya Shimomura, Takuya Shimomura, Shinnosuke Tokuhira, Shinnosuke Tokuhira, Yusuke Takenaka, Yusuke Takenaka, Takehiro Furuyama, Takehiro Furuyama, Akihiko Nishimura, Akihiko Nishimura, Hirohisa Uchida, Hirohisa Uchida, Takeshi Ohshima, Takeshi Ohshima, } "X-ray characterization of short-pulse laser illuminated hydrogen storage alloys having very high performance", Proc. SPIE 9589, X-Ray Lasers and Coherent X-Ray Sources: Development and Applications XI, 95890K (22 September 2015); doi: 10.1117/12.2186898; https://doi.org/10.1117/12.2186898

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