Size effects on rhodium nanoparticles related to hydrogen-storage capability

被引：16

作者：

Song, Chulho ^{[1
]}

Yang, Anli ^{[1
]}

Sakata, Osami ^{[1
,2
,3
]}

Kumara, L. S. R. ^{[1
]}

Hiroi, Satoshi ^{[2
]}

Cui, Yi-Tao ^{[4
]}

Kusada, Kohei ^{[5
]}

Kobayashi, Hirokazu ^{[5
]}

Kitagawa, Hiroshi ^{[5
,6
]}

机构：

[1] Natl Inst Mat Sci, Synchrotron Xray Stn SPring 8, Res Network & Facil Serv Div, 1-1-1 Kouto, Sayo, Hyogo 6795148, Japan

[2] Natl Inst Mat Sci, Synchrotron Xray Grp, Res Ctr Adv Measurement & Characterizat, 1-1-1 Kouto, Sayo, Hyogo 6795148, Japan

[3] Tokyo Inst Technol, Dept Innovat & Engn Mat, Midori Ku, 4259-J3-16 Nagatsuta, Yokohama, Kanagawa 2268502, Japan

[4] Univ Tokyo, Synchrotron Radiat Lab, Inst Solid State Phys, 1-490-2 Kouto,Shingu Cho, Tatsuno, Hyogo 6795165, Japan

[5] Kyoto Univ, Div Chem, Grad Sch Sci, Sakyo Ku, Kitashirakawa Oiwake Cho, Kyoto 6068502, Japan

[6] Kyushu Univ, INAMORI Frontier Res Ctr, Nishi Ku, 744 Motooka, Fukuoka, Fukuoka 8190395, Japan

来源：

PHYSICAL CHEMISTRY CHEMICAL PHYSICS | 2018年 / 20卷 / 22期

基金：

日本科学技术振兴机构;

关键词：

ABSORPTION FINE-STRUCTURE; X-RAY-DIFFRACTION; METALLIC NANOPARTICLES; LATTICE-PARAMETERS; CATALYTIC-ACTIVITY; SOLID ARGON; DEPENDENCE; PARTICLES; ENERGY; RH;

D O I：

10.1039/c8cp01678j

中图分类号：

O64 [物理化学（理论化学）、化学物理学];

学科分类号：

070304 ; 081704 ;

摘要：

To unveil the origin of the hydrogen-storage properties of rhodium nanoparticles (Rh NPs), we investigated the electronic and crystal structures of the Rh NPs using various synchrotron based X-ray techniques. Electronic structure studies revealed that the hydrogen-storage capability of Rh NPs could be attributed to their more unoccupied d-DOSs than that of the bulk near the Fermi level. Crystal structure studies indicated that lattice distortion and mean-square displacement increase while coordination number decreases with decreasing particle size and the hydrogen-absorption capability of Rh NPs improves to a greater extent with increased structural disorder in the local structure than with that in the mean structure. The smallest Rh NPs, having the largest structural disorder/increased vacancy spaces and the smallest coordination number, exhibited excellent hydrogen-storage capacity. Finally, from the bond-orientational order analysis, we confirmed that the localized disordering is distributed more over the surface part than the core part and hydrogen can be trapped on the surface part of Rh NPs which increases with a decrease in NP diameter.

引用

页码：15183 / 15191

页数：9

共 57 条

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