New Aspects of Enhancing the Graphene Capacitance by Defects in Aqueous Electrolytes and Ionic Liquids

The influence of internal and external defects in graphene on the capacitance of the graphene/electrolyte interface was explored using Density Functional Theory (DFT) calculations. Aqueous solutions and ionic liquids were considered as electrolyte. The results indicate that in aqueous solutions the...

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Bibliographic Details
Published inJETP letters Vol. 114; no. 5; pp. 263 - 268
Main Authors Kislenko, V. A., Pavlov, S. V., Fedorov, M. V., Kislenko, S. A.
Format Journal Article
LanguageEnglish
Published Moscow Pleiades Publishing 01.09.2021
Springer Nature B.V
Subjects
Aqueous electrolytes
Aqueous solutions
Atomic
Biological and Medical Physics
Biophysics
Capacitance
Condensed Matter
Defects
Density functional theory
Divacancies
Electrolytes
Functional groups
Graphene
Ionic liquids
Ions
Molecular
Optical and Plasma Physics
Particle and Nuclear Physics
Physics
Physics and Astronomy
Quantum Information Technology
Solid State Physics
Spintronics
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Summary:The influence of internal and external defects in graphene on the capacitance of the graphene/electrolyte interface was explored using Density Functional Theory (DFT) calculations. Aqueous solutions and ionic liquids were considered as electrolyte. The results indicate that in aqueous solutions the intrinsic defects, such as mono- and divacancies, enhance the integral capacitance more effectively than external ones, such as nitrogen impurity and oxygen functional groups, used in practice. On the other hand, the strategy of increasing the integral capacitance by creating defects in graphene is ineffective for ionic liquids with an electrochemical window larger than 2 V.
ISSN:0021-3640
1090-6487
DOI:10.1134/S0021364021170021