Shape-dependent hydrogen-storage properties in Pd nanocrystals: Which does hydrogen prefer, octahedron (111) or cube (100)?

Guangqin Li, Hirokazu Kobayashi, Shun Dekura, Ryuichi Ikeda, Yoshiki Kubota, Kenichi Kato, Masaki Takata, Tomokazu Yamamoto, Syo Matsumura, Hiroshi Kitagawa

Research output: Contribution to journalArticle

70 Citations (Scopus)

Abstract

Pd octahedrons and cubes enclosed by {111} and {100} facets, respectively, have been synthesized for investigation of the shape effect on hydrogen-absorption properties. Hydrogen-storage properties were investigated using in situ powder X-ray diffraction, in situ solid-state 2H NMR and hydrogen pressure-composition isotherm measurements. With these measurements, it was found that the exposed facets do not affect hydrogen-storage capacity; however, they significantly affect the absorption speed, with octahedral nanocrystals showing the faster response. The heat of adsorption of hydrogen and the hydrogen diffusion pathway were suggested to be dominant factors for hydrogen-absorption speed. Furthermore, in situ solid-state 2H NMR detected for the first time the state of 2H in a solid-solution (Pd + H) phase of Pd nanocrystals at rt.

Original languageEnglish
Pages (from-to)10222-10225
Number of pages4
JournalJournal of the American Chemical Society
Volume136
Issue number29
DOIs
Publication statusPublished - 2014 Jul 23
Externally publishedYes

ASJC Scopus subject areas

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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    Li, G., Kobayashi, H., Dekura, S., Ikeda, R., Kubota, Y., Kato, K., Takata, M., Yamamoto, T., Matsumura, S., & Kitagawa, H. (2014). Shape-dependent hydrogen-storage properties in Pd nanocrystals: Which does hydrogen prefer, octahedron (111) or cube (100)? Journal of the American Chemical Society, 136(29), 10222-10225. https://doi.org/10.1021/ja504699u