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Tunable Graphene Oxide Proton/Electron Mixed Conductor that Functions at Room Temperature
journal contribution
posted on 2014-10-14, 00:00 authored by Kazuto Hatakeyama, Hikaru Tateishi, Takaaki Taniguchi, Michio Koinuma, Tetsuya Kida, Shinya Hayami, Hiroyuki Yokoi, Yasumichi MatsumotoGraphene
oxide (GO) and reduced graphene oxide exhibit proton and
electron (or hole) conduction, respectively. Owing to this, the conductivity
of GO can be controlled via reduction because its electron conductivity
increases and its proton conductivity depends on the concentration
of epoxide groups. Herein, we report the successful control of the
proton and electron conductivities of GO using the photoirradiation
and thermal reduction processes. The proton conductivity decreases
when the epoxide content and layer distance decreases, whereas the
electron conductivity drastically increases with decreasing oxygen
content. Both the electron and proton conduction mechanisms for GO
are discussed based on the concentrations of various functional groups
and defects, changes in the interlayer distance, and the activation
energy associated with proton conduction. Finally, we determined the
most suitable degree of reduction for obtaining a good mixed conductor
useful as an electrode material and a hydrogen separation membrane
that functions at room temperature.
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electron conductivity increasesRoom TemperatureGraphene oxideepoxide groupslayer distance decreaseselectron conductivityhydrogen separation membranereduction processesproton conduction mechanismsproton conductivity decreasesoxygen contentelectron conductivitiesinterlayer distancegraphene oxide exhibit protonproton conductionproton conductivityroom temperatureepoxide contentelectrode materialactivation energy
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