Double enhancement of hydrogen storage capacity of Pd nanoparticles by 20 at% replacement with Ir; systematic control of hydrogen storage in Pd-M nanoparticles (M = Ir, Pt, Au)

Hirokazu Kobayashi; Miho Yamauchi; Ryuichi Ikeda; Tomokazu Yamamoto; Syo Matsumura; Hiroshi Kitagawa

doi:10.1039/c8sc01460d

Double enhancement of hydrogen storage capacity of Pd nanoparticles by 20 at% replacement with Ir; systematic control of hydrogen storage in Pd-M nanoparticles (M = Ir, Pt, Au)

Chem Sci. 2018 May 24;9(25):5536-5540. doi: 10.1039/c8sc01460d. eCollection 2018 Jul 7.

Authors

Hirokazu Kobayashi^{1

2}, Miho Yamauchi³, Ryuichi Ikeda¹, Tomokazu Yamamoto^{4

5}, Syo Matsumura^{4

5

6}, Hiroshi Kitagawa^{1

6

7}

Affiliations

¹ Division of Chemistry , Graduate School of Science , Kyoto University , Kitashirakawa-Oiwakecho, Sakyo-ku , Kyoto , 606-8502 , Japan . Email: hkobayashi@kuchem.kyoto-u.ac.jp ; Email: kitagawa@kuchem.kyoto-u.ac.jp.
² JST , PRESTO, 4-1-8 Honcho, Kawaguchi , Saitama , 332-0012 , Japan.
³ International Institute for Carbon-Neutral Energy Research (I2CNER) , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka , 819-0395 , Japan.
⁴ Department of Applied Quantum Physics and Nuclear Engineering , Graduate School of Engineering , Kyushu University , Motooka 744, Nishi-ku , Fukuoka , 819-0395 , Japan.
⁵ The Ultramicroscopy Research Center , Kyushu University , Motooka 744, Nishi-ku , Fukuoka , 819-0395 , Japan.
⁶ Inamori Frontier Research Center , Kyushu University , 744 Motooka, Nishi-ku , Fukuoka , 819-0395 , Japan.
⁷ Institute for Integrated Cell-Material Sciences (iCeMS) , Kyoto University , Yoshida, Sakyo-ku , Kyoto , 606-8501 , Japan.

Abstract

We report on binary solid-solution nanoparticles (NPs) composed of Pd and Ir, which are not miscible at the equilibrium state of the bulk, for the first time, by means of a process of hydrogen absorption/desorption from core (Pd)/shell (Ir) NPs. Only 20 at% replacement with Ir atoms doubled the hydrogen-storage capability compared to Pd NPs, which are a representative hydrogen-storage material. Furthermore, the systematic control of hydrogen concentrations and the corresponding pressure in Pd and Pd-M NPs (M = Ir, Pt, Au) have been achieved based on the band filling control of Pd NPs.