Hydrogen adsorption on Pd- and Ru-doped C60 fullerene at an ambient temperature

Dipendu Saha, Shuguang Deng

Research output: Contribution to journalArticlepeer-review

45 Scopus citations

Abstract

Palladium- and ruthenium-doped C60 fullerene compounds were synthesized by incipient wetness impregnation of C60 fullerene with the corresponding metal acetylacetonate precursors. Transmission electron microscopy (TEM) imaging of the metal-doped C60 fullerene samples showed different dispersion morphologies of palladium and ruthenium particles on the C60 matrix. Raman spectra revealed a drastic decrease in peak intensity followed by disappearance of several bands indicating the distortion of the C60 cage structure. The amorphous nature of the C60 fullerene compounds was confirmed by the X-ray diffraction study. Hydrogen adsorption amount of 0.85 wt % and 0. 69 wt % on Pd-C60 and Ru-C 60, respectively, as compared to 0.3 wt % on the pure C60 fullerene were measured at 300 bar and 298 K. The enhancement in the hydrogen uptakes can be attributed to several factors, including adsorption of molecular H2 on the defect sites, metallic hydride formation, spillover of hydrogen, and bond formation with atomic hydrogen with different active sites of carbon of host fullerene. The hydrogen adsorption isotherms are of type III and can be correlated by the Freundlich (for Ru-C60) and modified Oswin equations (for Pd-C60 and pristine C60).

Original languageEnglish (US)
Pages (from-to)6780-6786
Number of pages7
JournalLangmuir
Volume27
Issue number11
DOIs
StatePublished - Jun 7 2011
Externally publishedYes

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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