Graphene oxide nanosheet with high proton conductivity

Mohammad Razaul Karim, Kazuto Hatakeyama, Takeshi Matsui, Hiroshi Takehira, Takaaki Taniguchi, Michio Koinuma, Yasumichi Matsumoto, Tomoyuki Akutagawa, Takayoshi Nakamura, Shin Ichiro Noro, Teppei Yamada, Hiroshi Kitagawa, Shinya Hayami

Research output: Contribution to journalArticlepeer-review

416 Citations (Scopus)


We measured the proton conductivity of bulk graphite oxide (GO′), a graphene oxide/proton hybrid (GO-H), and a graphene oxide (GO) nanosheet for the first time. GO is a well-known electronic insulator, but for proton conduction we observed the reverse trend, as it exhibited superionic conductivity. The hydrophilic sites present in GO as -O-, -OH, and -COOH functional groups attract the protons, which propagate through hydrogen-bonding networks along the adsorbed water film. The proton conductivities of GO′ and GO-H at 100% humidity were ∼10-4 and ∼10-5 S cm-1, respectively, whereas that for GO was amazingly high, nearly 10-2 S cm-1. This finding indicates the possibility of GO-based perfect two-dimensional proton-conductive materials for applications in fuel cells, sensors, and so on.

Original languageEnglish
Pages (from-to)8097-8100
Number of pages4
JournalJournal of the American Chemical Society
Issue number22
Publication statusPublished - Jun 5 2013
Externally publishedYes

All Science Journal Classification (ASJC) codes

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


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