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

    439 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 - 2013 Jun 5

    ASJC Scopus subject areas

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


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