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When supporting electrolyte matters: Tuning capacitive response of graphene oxide via electrochemical reduction in alkali and alkaline earth metal chlorides
Univ Belgrade, Fac Phys Chem, Studentski Trg 12-16, Belgrade 11158, Serbia.
Univ Sarajevo, Fac Sci, Dept Chem, Zmaja Bosne 33-35, Sarajevo 71000, Bosnia & Herceg.
Univ Belgrade, Fac Phys Chem, Studentski Trg 12-16, Belgrade 11158, Serbia.
Univ Belgrade, Fac Phys Chem, Studentski Trg 12-16, Belgrade 11158, Serbia;KTH Royal Inst Technol, Dept Mat Sci & Engn, Sch Ind Engn & Management, Brinellvagen 23, S-10044 Stockholm, Sweden.
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2019 (English)In: Electrochimica Acta, ISSN 0013-4686, E-ISSN 1873-3859, Vol. 297, p. 112-117Article in journal (Refereed) Published
Abstract [en]

The ability to tune charge storage properties of graphene oxide (GO) is of utmost importance for energy conversion applications. Here we show that the electrochemical reduction of GO is highly sensitive to the cations present in the solution. GO is reduced at more negative potential in alkali metal chloride solutions than in alkaline earth metal chlorides. During the reduction, the capacitance of GO increases from 10 to 70 times. The maximum capacitances of reduced GO are between 65 and 130 F g-1, depending on the electrolyte and the presence of conductive additive. We propose that different interactions of cations with oxygen functional groups of GO during the reduction are responsible for the observed effect. This hypothesis has been confirmed by Density Functional Theory calculations of alkali and alkaline earth metals interactions with epoxy-functionalized graphene sheet.

Place, publisher, year, edition, pages
2019. Vol. 297, p. 112-117
Keywords [en]
Graphene oxide, Capacitance, Electrochemical reduction, Capacitance tuning
National Category
Materials Chemistry
Identifiers
URN: urn:nbn:se:uu:diva-375794DOI: 10.1016/j.electacta.2018.11.173ISI: 000455642500014OAI: oai:DiVA.org:uu-375794DiVA, id: diva2:1289099
Funder
Swedish Research Council, 2014-5993Carl Tryggers foundation , 17:503Swedish National Infrastructure for Computing (SNIC)Available from: 2019-02-15 Created: 2019-02-15 Last updated: 2019-02-15Bibliographically approved

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Skorodumova, Natalia V.

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