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Report No.
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Irradiation effects on hydrogen absorption rate of metal hydride

Onuki, Shun*; Abe, Hiroshi; Matsumura, Yoshihito*; Uchida, Hirohisa*

Hydrogen storage alloys are required high hydrogen absorption rate for the negative electrodes of the Ni-MH batteries applications. Surface modifications are crucial to improve the reactivity of hydrogen with metals because the dissociation of the H$$_{2}$$ molecules in the gas phase or the dissociation of the H$$_{2}$$O molecules in an electrochemical process is the first step of the overall reaction of hydrogen absorption by metals. In the present study, irradiation effects on electron beam and charged ions on hydriding characteristics of LaNi$$_{4.6}$$Al$$_{0.4}$$ alloy were studied. The hydrogen absorption rare measurements were also performed for the irradiated and un-irradiated samples using an electrochemical method. The crystal structure and phase of the bulk of the irradiated alloys were determined by X-ray diffraction. We will discus the effects of irradiation fo electron beam and ions on the improvement of the rate of hydrogen absorption by the LaNi$$_{4.6}$$Al$$_{0.4}$$ alloys.

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