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A comparative analysis of graphene oxide films as proton conductors |
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| Authors: | V A Smirnov N N Denisov N N Dremova Y M Vol’fkovich A Y Rychagov V E Sosenkin K G Belay G L Gutsev N Yu Shulga Y M Shulga |
| Institution: | 1. Institute of Problems of Chemical Physics, Russian Academy of Sciences, Moscow Region, Chernogolovka, 142432, Russia 2. A.N. Frumkin Institute of Physical Chemistry and Electrochemistry RAS, Moscow, Russia 3. Department of Physics, Florida A&M University, Tallahassee, FL, 32307, USA 4. National University of Science and Technology MISIS, Leninsky pr. 4, Moscow, 119049, Russia |
| Abstract: | The electrical conductivity of graphene oxide (GO) films in vapors of water and acid solutions is found to be close to the conductivity of a film formed after drying the solution of phenol-2,4-disulfonic acid in polyvinyl alcohol, which is known to be a proton conductor. We found that the conductivity of a GO film in vapors of the H2O–H2SO4 electrolyte possesses a sharp maximum at ~1 % by weight of sulfuric acid. The highest conductivity of GO films can be expected when placing the films over acid vapors where the acid concentration is essentially lower than in the acid solutions at their maximum conductivity. Since the conductivity of the H2O–H2SO4 electrolyte itself has a maximum at ~30 % by weight of sulfuric acid, the use of intermediate concentrations of H2SO4 is recommended in practical applications. The GO films permeated with water or acid solution in water are expected to possess the proton-exchange properties similar to those of other proton-exchanging membranes. |
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