X-ray characterization of short-pulse laser illuminated hydrogen storage alloys having very high performance

Hiroyuki Daido; Hiroshi Abe; Takahisa Shobu; Takuya Shimomura; Shinnosuke Tokuhira; Yusuke Takenaka; Takehiro Furuyama; Akihiko Nishimura; Hirohisa Uchida; Takeshi Ohshima

doi:10.1117/12.2186898

22 September 2015 X-ray characterization of short-pulse laser illuminated hydrogen storage alloys having very high performance

Hiroyuki Daido, Hiroshi Abe, Takahisa Shobu, Takuya Shimomura, Shinnosuke Tokuhira, Yusuke Takenaka, Takehiro Furuyama, Akihiko Nishimura, Hirohisa Uchida, Takeshi Ohshima

Author Affiliations +

Proceedings Volume 9589, X-Ray Lasers and Coherent X-Ray Sources: Development and Applications XI; 95890K (2015) https://doi.org/10.1117/12.2186898
Event: SPIE Optical Engineering + Applications, 2015, San Diego, California, United States

Abstract

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 LaNi_4.6Al_0.4 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, Hiroshi Abe, Takahisa Shobu, Takuya Shimomura, Shinnosuke Tokuhira, Yusuke Takenaka, Takehiro Furuyama, Akihiko Nishimura, Hirohisa Uchida, and 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); https://doi.org/10.1117/12.2186898

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KEYWORDS

Hydrogen

Absorption

Ions

Pulsed laser operation

Solids

Chemical species

X-ray diffraction

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