2017年第78回応用物理学会秋季学術講演会

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一般セッション(口頭講演)

9 応用物性 » 9.2 ナノワイヤ・ナノ粒子

[6a-S44-1~10] 9.2 ナノワイヤ・ナノ粒子

2017年9月6日(水) 09:15 〜 11:45 S44 (第5会議室)

中津川 博(横国大)

09:15 〜 09:30

[6a-S44-1] Size-dependent hydrogen-storage properties in Rh nanoparticles, revealed by synchrotron-based X-ray techniques: HEXRD, EXAFS

Song Chulho1、Yang Anli1、Kumara L. S. R.1、Hiroi Satoshi1、Kusada Kohei2、Kobayashi Hirokazu2、Kitagawa Hiroshi2 (1.NIMS/SPring-8、2.Kyoto Univ.)

キーワード:Hydrogen-storage ability、Rh nanoparticles

We have investigated the structural characterization of Rh NPs with various particle sizes (2.4, 4.0, 7.1, 10.5 nm), using the synchrotron based X-ray techniques. To unveil the origin of their hydrogen absorption ability, we used the particle size dependence of lattice distortion, coordination number, mean-square displacement and volume fraction of cavities for Rh NPs. From the HEXRD and EXAFS, It is found that the lattice distortion/mean-square displacement increase and coordination number decreases with decreasing the particle size. This result suggested that the hydrogen absorption ability of Rh NPs is more closely related to mean-square displacement for local structure (EXAFS) than that for mean structure (HEXRD). From the cavity analysis, we confirmed that the cavities are distributed over the whole particle and hydrogen can be trapped on the entire volume for the smallest Rh NPS. The obtained structural information will contribute to designing and improving the functionality of nano-sized metals.