Electrochemical Properties of Coke-Derived Graphene Oxide Reduced by Ascorbic Acid
- Authors: Puzynin A.V.1,2, Simenyuk G.Y.1, Barnakov C.N.1, Ilkevich L.V.1
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Affiliations:
- Institute of Coal Chemistry and Materials Chemistry
- Gorbachev Kuznetsk Basin State Technical University
- Issue: Vol 62, No 8 (2019)
- Pages: 353-358
- Section: Chemistry
- URL: https://journals.rcsi.science/1068-364X/article/view/226894
- DOI: https://doi.org/10.3103/S1068364X19080040
- ID: 226894
Cite item
Abstract
Abstract—The capacitive characteristics of reduced graphene oxide are investigated. The graphene is produced from coke by the modified Hummers method and then reduced by means of ascorbic acid. The curves obtained by cyclic voltammetry in acidic and alkaline electrolytes, with scanning of the potential at 10 mV/s, do not include pseudocapacitive peaks. Such peaks may be due to oxygen-bearing groups at the carbon surface. In the experiments, a two-electrode electrochemical supercapacitor cell is used, as well as a PARSTAT 4000 potentiostat–galvanostat. The greatest specific capacitance (310 F/g in the range from –1 V to +1 V at a scanning rate of 10 mV/s) and the lowest internal resistance of the cell are found for reduced graphene oxide in 2 M H2SO4 solution.
About the authors
A. V. Puzynin
Institute of Coal Chemistry and Materials Chemistry; Gorbachev Kuznetsk Basin State Technical University
Author for correspondence.
Email: doran@ngs.ru
Russian Federation, Kemerovo; Kemerovo
G. Yu. Simenyuk
Institute of Coal Chemistry and Materials Chemistry
Author for correspondence.
Email: galina-simenyuk@yandex.ru
Russian Federation, Kemerovo
Ch. N. Barnakov
Institute of Coal Chemistry and Materials Chemistry
Author for correspondence.
Email: barnakov@rambler.ru
Russian Federation, Kemerovo
L. V. Ilkevich
Institute of Coal Chemistry and Materials Chemistry
Author for correspondence.
Email: lida1193@mail.ru
Russian Federation, Kemerovo