Insight into the Electrical Double Layer of an Ionic Liquid on Graphene

Abstract Graphene is a promising next-generation conducting material with the potential to replace traditional electrode materials in supercapacitors. Since energy storage in supercapacitors relies on the electrolyte-electrode interface, here we elucidate the interfacial subnanometer structure of a...

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Autores principales:	L. Andres Jurado, Rosa M. Espinosa-Marzal
Formato:	article
Lenguaje:	EN
Publicado:	Nature Portfolio 2017
Materias:	Medicine R Science Q
Acceso en línea:	https://doaj.org/article/66386895d0f44a66a2372af4f3889eb2
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spelling	oai:doaj.org-article:66386895d0f44a66a2372af4f3889eb22021-12-02T15:05:55ZInsight into the Electrical Double Layer of an Ionic Liquid on Graphene10.1038/s41598-017-04576-x2045-2322https://doaj.org/article/66386895d0f44a66a2372af4f3889eb22017-06-01T00:00:00Zhttps://doi.org/10.1038/s41598-017-04576-xhttps://doaj.org/toc/2045-2322Abstract Graphene is a promising next-generation conducting material with the potential to replace traditional electrode materials in supercapacitors. Since energy storage in supercapacitors relies on the electrolyte-electrode interface, here we elucidate the interfacial subnanometer structure of a single component liquid composed solely of cations and anions – an ionic liquid- on electrified graphene. We study the effect of applied potential on the interaction between graphene and a silicon tip in an ionic liquid and describe it within the framework of the Derjaguin-Landau-Verwey-Overbeck (DLVO) theory. The energy is stored in an electrical double layer composed of an extended Stern layer, which consists of multiple ion layers over ~2 nanometers, beyond which a diffuse layer forms to compensate the applied potential on graphene. The electrical double layer significantly responds to the applied potential, and it shows the transition from overscreening to crowding of counterions at the interface at the highest applied potentials. It is proposed that surface charging occurs through the adsorption of the imidazolium cation to unbiased graphene (likely due to π-π interactions) and that the surface potential is better compensated when counterion crowding happens. This study scrutinizes the electrified graphene-ionic liquid interface, with implications not only in the field of energy storage, but also in lubrication.L. Andres JuradoRosa M. Espinosa-MarzalNature PortfolioarticleMedicineRScienceQENScientific Reports, Vol 7, Iss 1, Pp 1-12 (2017)
institution	DOAJ
collection	DOAJ
language	EN
topic	Medicine R Science Q
spellingShingle	Medicine R Science Q L. Andres Jurado Rosa M. Espinosa-Marzal Insight into the Electrical Double Layer of an Ionic Liquid on Graphene
description	Abstract Graphene is a promising next-generation conducting material with the potential to replace traditional electrode materials in supercapacitors. Since energy storage in supercapacitors relies on the electrolyte-electrode interface, here we elucidate the interfacial subnanometer structure of a single component liquid composed solely of cations and anions – an ionic liquid- on electrified graphene. We study the effect of applied potential on the interaction between graphene and a silicon tip in an ionic liquid and describe it within the framework of the Derjaguin-Landau-Verwey-Overbeck (DLVO) theory. The energy is stored in an electrical double layer composed of an extended Stern layer, which consists of multiple ion layers over ~2 nanometers, beyond which a diffuse layer forms to compensate the applied potential on graphene. The electrical double layer significantly responds to the applied potential, and it shows the transition from overscreening to crowding of counterions at the interface at the highest applied potentials. It is proposed that surface charging occurs through the adsorption of the imidazolium cation to unbiased graphene (likely due to π-π interactions) and that the surface potential is better compensated when counterion crowding happens. This study scrutinizes the electrified graphene-ionic liquid interface, with implications not only in the field of energy storage, but also in lubrication.
format	article
author	L. Andres Jurado Rosa M. Espinosa-Marzal
author_facet	L. Andres Jurado Rosa M. Espinosa-Marzal
author_sort	L. Andres Jurado
title	Insight into the Electrical Double Layer of an Ionic Liquid on Graphene
title_short	Insight into the Electrical Double Layer of an Ionic Liquid on Graphene
title_full	Insight into the Electrical Double Layer of an Ionic Liquid on Graphene
title_fullStr	Insight into the Electrical Double Layer of an Ionic Liquid on Graphene
title_full_unstemmed	Insight into the Electrical Double Layer of an Ionic Liquid on Graphene
title_sort	insight into the electrical double layer of an ionic liquid on graphene
publisher	Nature Portfolio
publishDate	2017
url	https://doaj.org/article/66386895d0f44a66a2372af4f3889eb2
work_keys_str_mv	AT landresjurado insightintotheelectricaldoublelayerofanionicliquidongraphene AT rosamespinosamarzal insightintotheelectricaldoublelayerofanionicliquidongraphene
_version_	1718388648073756672

Insight into the Electrical Double Layer of an Ionic Liquid on Graphene

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