Graphene/Ionic Liquid Ultracapacitors: Does Ionic Size Correlate with Storage Energy Performance?

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dc.citation.issue22pt_BR
dc.contributor.authorChaban, Vitaly V.
dc.contributor.authorAndreeva, Nadezha A.
dc.contributor.authorEudes, Fileti [UNIFESP]
dc.contributor.authorLatteshttp://lattes.cnpq.br/5294929829300325pt_BR
dc.date.accessioned2020-01-21T12:44:32Z
dc.date.available2020-01-21T12:44:32Z
dc.date.issued2018-04-21
dc.description.abstractAn electric double layer ultracapacitor stores energy in an electric double layer formed near its electrolyte/electrode interfaces. Graphene-based ultracapacitors, because of their outstanding performance, have attracted significant research interest. Optimization of ultracapacitor performance requires understanding the correlation of molecular characteristic of the device (such as structure, inter-ionic and ion-electrode interactions) with its macroscopic properties. Herein, we report molecular dynamics study of how an ionic volume impacts a double-layer capacitance. Four systems were probed: large cation + large anion, large cation + small anion, small cation + large anion, small cation + small anion. Our results show that the structuring of the ionic liquid is driven by the electrolyte-electrode interactions in the ultracapacitor, which are predominantly of the van der Waals type. Storage density energies are similar for all ultracapacitors, being in the range of 24 to 28 J cm-3 at 5.0V. Our results present a comparative analysis of the performances of four different ILs confined between two graphene electrodes. Although the best performance has been observed for the IL with ions (cations and anions) of equal sizes, no definite conclusion about the correlation of the performance to the ionic size ratio can be made from the present study.
dc.description.affiliationInstituto de Ciência e Tecnologia, Universidade Federal de São Paulo, São José dos Campos, SP, Brazil
dc.description.affiliationUnifespP.E.S., Vasilievsky Island, Saint Petersburg, Leningrad Oblast, Russian Federation
dc.description.affiliationUnifespDepartment of Physics, St. Petersburg State University, St. Petersburg, Russian Federation
dc.description.affiliationUnifespInstituto de Ciência e Tecnologia, Universidade Federal de São Paulo, São José dos Campos, SP, Brazil
dc.format.extent18409-18417pt_BR
dc.identifierhttps://doi.org/10.1039/C8NJ04399Jpt_BR
dc.identifier.citationNew Journal of Chemistry, v. 42, n. 22, p. 18409-18417, 2018.pt_BR
dc.identifier.doihttps://doi.org/10.1039/C8NJ04399J
dc.identifier.issn1369-9261pt_BR
dc.identifier.urihttps://repositorio.unifesp.br/handle/11600/51809
dc.languageporpt_BR
dc.publisherRSCpt_BR
dc.relation.ispartofNew Jounal of Chemistrypt_BR
dc.rightsinfo:eu-repo/semantics/openAccesspt_BR
dc.subjectSupercapacitors
dc.subjectmolecular dynamics
dc.subjectionic liquids
dc.titleGraphene/Ionic Liquid Ultracapacitors: Does Ionic Size Correlate with Storage Energy Performance?pt_BR
dc.typeinfo:eu-repo/semantics/articlept_BR
unifesp.campusInstituto de Ciências e Tecnologia (ICT)pt_BR
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