title: Hydrogen storage in Pd nanocrystals covered with a metal-organic framework.
abstract: Hydrogen is an essential component in many industrial processes. As a result of the recent increase in the development of shale gas, steam reforming of shale gas has received considerable attention as a major source of H2, and the more efficient use of hydrogen is strongly demanded. Palladium is well known as a hydrogen-storage metal and an effective catalyst for reactions related to hydrogen in a variety of industrial processes. Here, we present remarkably enhanced capacity and speed of hydrogen storage in Pd nanocrystals covered with the metal-organic framework (MOF) HKUST-1 (copper(II) 1,3,5-benzenetricarboxylate). The Pd nanocrystals covered with the MOF have twice the storage capacity of the bare Pd nanocrystals. The significantly enhanced hydrogen storage capacity was confirmed by hydrogen pressure-composition isotherms and solid-state deuterium nuclear magnetic resonance measurements. The speed of hydrogen absorption in the Pd nanocrystals is also enhanced by the MOF coating.
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Guangqin
authors.initials: G
authors.lastname: Li
authors.affiliation: 1] Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan [2] JST CREST, 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan.
authors.forename: Hirokazu
authors.initials: H
authors.lastname: Kobayashi
authors.affiliation: Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan.
authors.forename: Jared M
authors.initials: JM
authors.lastname: Taylor
authors.affiliation: 1] Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan [2] JST CREST, 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan.
authors.forename: Ryuichi
authors.initials: R
authors.lastname: Ikeda
authors.affiliation: Department of Physical Science, Graduate School of Science, Osaka Prefecture University, Sakai, Osaka 599-8531, Japan.
authors.forename: Yoshiki
authors.initials: Y
authors.lastname: Kubota
authors.affiliation: 1] RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan [2] Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan.
authors.forename: Kenichi
authors.initials: K
authors.lastname: Kato
authors.affiliation: 1] RIKEN SPring-8 Center, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5148, Japan [2] Japan Synchrotron Radiation Research Institute, 1-1-1 Kouto, Sayo-cho, Sayo-gun, Hyogo 679-5198, Japan.
authors.forename: Masaki
authors.initials: M
authors.lastname: Takata
authors.affiliation: 1] JST CREST, 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan [2] Research Laboratory of High-Voltage Electron Microscope, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Tomokazu
authors.initials: T
authors.lastname: Yamamoto
authors.affiliation: 1] JST CREST, 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan [2] Research Laboratory of High-Voltage Electron Microscope, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Shoichi
authors.initials: S
authors.lastname: Toh
authors.affiliation: 1] JST CREST, 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan [2] Research Laboratory of High-Voltage Electron Microscope, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan [3] Department of Applied Quantum Physics and Nuclear Engineering, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan [4] INAMORI Frontier Research Center, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan.
authors.forename: Syo
authors.initials: S
authors.lastname: Matsumura
authors.affiliation: 1] Division of Chemistry, Graduate School of Science, Kyoto University, Kitashirakawa-Oiwakecho, Sakyo-ku, Kyoto 606-8502, Japan [2] JST CREST, 7, Gobancho, Chiyoda-ku, Tokyo 102-0076, Japan [3] INAMORI Frontier Research Center, Kyushu University, Motooka 744, Nishi-ku, Fukuoka 819-0395, Japan [4] Institute for Integrated Cell-Material Sciences (iCeMS), Kyoto University, Yoshida, Sakyo-ku, Kyoto 606-8501, Japan.
authors.forename: Hiroshi
authors.initials: H
authors.lastname: Kitagawa