Graphene oxide nanosheet with high proton conductivity.
J Am Chem Soc
; 135(22): 8097-100, 2013 Jun 05.
Article
em En
| MEDLINE
| ID: mdl-23676105
ABSTRACT
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 â¼10(-4) and â¼10(-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.
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MEDLINE
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En
Ano de publicação:
2013
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Article