Exfoliated graphene sheets decorated with metal/metal oxide nanoparticles: Simple preparation from cation exchanged graphite oxide

Kazuma Gotoh, Taro Kinumoto, Eiji Fujii, Aki Yamamoto, Hideki Hashimoto, Takahiro Ohkubo, Atsushi Itadani, Yasushige Kuroda, Hiroyuki Ishida

Research output: Contribution to journalArticle

96 Citations (Scopus)

Abstract

We produced carbon hybrid materials of graphene sheets decorated with metal or metal oxide nanoparticles of gold, silver, copper, cobalt, or nickel from cation exchanged graphite oxide. Measurements using powder X-ray diffraction, transmission electron microscopy, and X-ray absorption spectra revealed that the Au and Ag in the materials (Au-Gr and Ag-Gr) existed on graphene sheets as metal nanoparticles, whereas Cu and Co in the materials (Cu-Gr and Co-Gr) existed as a metal oxide. Most Ni particles in Ni-Gr were metal, but the surfaces of large particles were partly oxidized, producing a core-shell structure. The Ag-Gr sample showed a catalytic activity for the oxygen reduction reaction in 1.0 M KOH aq. under an oxygen atmosphere. Ag-Gr is superior as a cathode in alkaline fuel cells, which should not be disturbed by the methanol cross-over problem from the anode. We established an effective approach to prepare a series of graphene-nanoparticle composite materials using heat treatment.

Original languageEnglish
Pages (from-to)1118-1125
Number of pages8
JournalCarbon
Volume49
Issue number4
DOIs
Publication statusPublished - Apr 2011

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Graphite
Oxides
Graphene
Cations
Positive ions
Metals
Nanoparticles
Alkaline fuel cells
Oxygen
Metal nanoparticles
Hybrid materials
X ray absorption
Cobalt
Nickel
Silver
Gold
X ray powder diffraction
Methanol
Copper
Absorption spectra

ASJC Scopus subject areas

  • Chemistry(all)

Cite this

Exfoliated graphene sheets decorated with metal/metal oxide nanoparticles : Simple preparation from cation exchanged graphite oxide. / Gotoh, Kazuma; Kinumoto, Taro; Fujii, Eiji; Yamamoto, Aki; Hashimoto, Hideki; Ohkubo, Takahiro; Itadani, Atsushi; Kuroda, Yasushige; Ishida, Hiroyuki.

In: Carbon, Vol. 49, No. 4, 04.2011, p. 1118-1125.

Research output: Contribution to journalArticle

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AU - Hashimoto, Hideki

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AU - Itadani, Atsushi

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