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)

09:45 〜 10:00

[6a-S44-3] On-board Hydrogen Storage in PdxPt1-x Solid-solution Nanoparticles

〇(PC)Rosantha Kumara1、Osami Sakata1、Hirokazu Kobayashi2、Chulho Song1、Toshiki Yoshimoto3、Satoru Yoshioka3、Syo Matsumura3、Hiroshi Kitagawa2 (1.NIMS/SPring-8、2.Kyoto Univ.、3.Kyushu Univ.)

キーワード:Nanoparticles, Hydrogen Storage, Electronic structure

Hydrogen is an energy carrier like electricity and it can be produced from hydrocarbons and electrolysis of water. It is the fuel having the highest energy density. One of the most critical problem in hydrogen technology is transportation and on-vehicle storage of hydrogen. However, solid-state nanomaterials for hydrogen storage offer best opportunity for developing the technology required for on-board applications. Palladium is famous for hydrogen storage in both its bulk and nanoparticle (NP) forms. The hydrogen-storage capacity of the PdxPt1-x solid-solution NPs can be tuned by changing the composition of Pd and Pt. Specially, PdxPt1-x solid-solution NPs with 0.79 ≤ x ≤ 0.92 possessed a higher hydrogen-storage capacity than Pd NPs and Pd/Pt core/shell NPs. Recent studies have suggested that the hydrogen dissociation of the PdxPt1-x solid-solution alloy is proportional to the hydrogen-metal bond strength and to the d-band states near the Fermi level. In this study, the correlation between the electronic structure properties such as the unoccupied electronic states and their density of states, and the hydrogen storage and stability properties of the PdxPt1-x solid-solution NPs were investigated by mean of synchrotron X-ray absorption near-edge structure (XANES) and hard X-ray photoelectron spectroscopy (HAXPES).