Hatakeyama, Kazuto Tateishi, Hikaru Taniguchi, Takaaki Koinuma, Michio Kida, Tetsuya Hayami, Shinya Yokoi, Hiroyuki Matsumoto, Yasumichi Tunable Graphene Oxide Proton/Electron Mixed Conductor that Functions at Room Temperature Graphene 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. electron conductivity increases;Room TemperatureGraphene oxide;epoxide groups;layer distance decreases;electron conductivity;hydrogen separation membrane;reduction processes;proton conduction mechanisms;proton conductivity decreases;oxygen content;electron conductivities;interlayer distance;graphene oxide exhibit proton;proton conduction;proton conductivity;room temperature;epoxide content;electrode material;activation energy 2014-10-14
    https://acs.figshare.com/articles/journal_contribution/Tunable_Graphene_Oxide_Proton_Electron_Mixed_Conductor_that_Functions_at_Room_Temperature/2245333
10.1021/cm502098e.s001