Electrochemical intercalation of bromine into graphite in an aqueous electrolyte solution |
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| Affiliation: | 1. Nikolaev Institute of Inorganic Chemistry SB RAS, 630090, 3 Lavrentiev av., Novosibirsk, Russia;2. Skolkovo Institute of Science and Technology, Center for Electrochemical Energy Storage, 143026 Nobel St. 3, Moscow, Russia;3. Novosibirsk State University, 630090, Pirogova st. 2, Novosibirsk, Russia;4. Saint Petersburg State University, Institute of Chemistry, 199034, Universitetskaya Nab. 7-9, Saint Petersburg, Russia;5. Kazan Federal University, Alexander Butlerov Institute of Chemistry, Lobachevskogo St. 1/29, 420008, Kazan, Russia |
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| Abstract: | By electrochemical oxidation of a graphite sheet in an aqueous solution of potassium bromide, the intercalation of bromine was observed. It was confirmed by the measurements of weight increase of about 10%, decrease in relative electrical resistivity down to 0.69, and enlargement of average interlayer spacing. On the graphite sheet pre-electrolyzed in KBr solution, the chronopotentiogram in K2SO4 aqueous solution showed some plateaux corresponding to the reduction of graphite intercalation compounds with bromine. The longest time on a plateau was observed on the graphite sheet pre-electrolyzed in a potential region of bromine gas evolution, where the most pronounced decrease in electrical resistivity of graphite sheet was detected. |
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