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Origin of degradation in the reversible hydrogen storage capacity of V$$_{1-x}$$Ti$$_{x}$$ alloys from the atomic pair distribution function analysis

二体分布関数解析によるV$$_{1-x}$$Ti$$_{x}$$合金の繰り返し水素吸蔵量低下の起源

Kim, H.*; 榊 浩司*; 小川 浩*; 中村 優美子*; 中村 仁*; 秋葉 悦男*; 町田 晃彦; 綿貫 徹; Proffen, T.*

Kim, H.*; Sakaki, Koji*; Ogawa, Hiroshi*; Nakamura, Yumiko*; Nakamura, Jin*; Akiba, Etsuo*; Machida, Akihiko; Watanuki, Tetsu; Proffen, T.*

水素吸蔵放出の繰り返しによる水素吸蔵量の低下は多くの水素吸蔵合金で観測されているが、その起源は明らかではない。本研究ではV$$_{1-x}$$Ti$$_x$$合金の低水素吸蔵サイクル特性の考えられる構造的要因について明らかにするために、放射光X線全散乱データを利用した二体分布関数解析によってV$$_{1-x}$$Ti$$_x$$H$$_2$$, $$x=$$0, 0.2, 0.5の水素吸蔵放出サイクルで初めの15サイクルにおける格子欠陥や無秩序化について調べた。

Reduction in reversible hydrogen storage capacity with increasing hydrogenation and dehydrogenation cycle number is observed in numerous hydrogen storage materials, but the mechanism behind this unfavorable change has not been elucidated yet. In this study, we have investigated the development of structural defects or disorders in V$$_{1-x}$$Ti$$_x$$H$$_2$$, $$x$$ = 0, 0.2, and 0.5, during the first 15 hydrogen absorption and desorption cycles using the atomic pair distribution function (PDF) analysis of synchrotron X-ray total scattering data to find out the possible structural origin of the poor cyclic stability of V$$_{1-x}$$Ti$$_x$$ alloys.

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パーセンタイル:34.93

分野:Chemistry, Physical

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