Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisited
- Autores
- Gutierrez, Fabiana Andrea; Bedatty Fernandes, Flavio Cesar; Rivas, Gustavo Adolfo; Bueno, Paulo Roberto
- Año de publicación
- 2017
- Idioma
- inglés
- Tipo de recurso
- artículo
- Estado
- versión publicada
- Descripción
- The electronic density of states and its contribution to the capacitance of graphene compounds (oxidized and reduced) were investigated using an electrochemical impedance-derived capacitance spectroscopic approach. It is clearly demonstrated that graphene oxide, which is known to exhibit semiconductor electronic characteristics, has little influence on the magnitude of the measured capacitance. Moreover, when graphene oxide is electrochemically reduced to graphene, the capacitance increases dramatically by about three orders of magnitude (from microfaradays to millifaradays). This increased capacitive effect has been interpreted as being directly associated with the electrochemical non-faradaic (super- or ultracapacitive) characteristics of the interface (i.e. associated with its electroactive area, for instance). The results obtained and interpretation made in this work demonstrate that the magnitude of the measured capacitance is a consequence of an electrochemical capacitive phenomenon (mesoscopic in essence; thus, the associated capacitance is equivalently termed mesoscopic capacitance) that energetically contains, in series, both electrostatic (geometrical) and quantum effects, thus being essentially different from those exclusively related to the amount of existing interfacial sites for ions (i.e. beyond those associated with pure double-layer capacitive effects). Conceptually, it is proposed that the mesoscopic capacitance of reduced graphene can be explained mainly through quantum chemical effects, ultimately following first-principles quantum mechanics supported on density functional theory, wherein the density of states is central.
Fil: Gutierrez, Fabiana Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
Fil: Bedatty Fernandes, Flavio Cesar. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil
Fil: Rivas, Gustavo Adolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina
Fil: Bueno, Paulo Roberto. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil - Materia
-
Mesoscopic Capacitance
Electrostatic Effects
Quantum Effects - Nivel de accesibilidad
- acceso abierto
- Condiciones de uso
- https://creativecommons.org/licenses/by-nc-sa/2.5/ar/
- Repositorio
- Institución
- Consejo Nacional de Investigaciones Científicas y Técnicas
- OAI Identificador
- oai:ri.conicet.gov.ar:11336/62331
Ver los metadatos del registro completo
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Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisitedGutierrez, Fabiana AndreaBedatty Fernandes, Flavio CesarRivas, Gustavo AdolfoBueno, Paulo RobertoMesoscopic CapacitanceElectrostatic EffectsQuantum Effectshttps://purl.org/becyt/ford/1.4https://purl.org/becyt/ford/1The electronic density of states and its contribution to the capacitance of graphene compounds (oxidized and reduced) were investigated using an electrochemical impedance-derived capacitance spectroscopic approach. It is clearly demonstrated that graphene oxide, which is known to exhibit semiconductor electronic characteristics, has little influence on the magnitude of the measured capacitance. Moreover, when graphene oxide is electrochemically reduced to graphene, the capacitance increases dramatically by about three orders of magnitude (from microfaradays to millifaradays). This increased capacitive effect has been interpreted as being directly associated with the electrochemical non-faradaic (super- or ultracapacitive) characteristics of the interface (i.e. associated with its electroactive area, for instance). The results obtained and interpretation made in this work demonstrate that the magnitude of the measured capacitance is a consequence of an electrochemical capacitive phenomenon (mesoscopic in essence; thus, the associated capacitance is equivalently termed mesoscopic capacitance) that energetically contains, in series, both electrostatic (geometrical) and quantum effects, thus being essentially different from those exclusively related to the amount of existing interfacial sites for ions (i.e. beyond those associated with pure double-layer capacitive effects). Conceptually, it is proposed that the mesoscopic capacitance of reduced graphene can be explained mainly through quantum chemical effects, ultimately following first-principles quantum mechanics supported on density functional theory, wherein the density of states is central.Fil: Gutierrez, Fabiana Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina. Universidade Estadual Paulista Julio de Mesquita Filho; BrasilFil: Bedatty Fernandes, Flavio Cesar. Universidade Estadual Paulista Julio de Mesquita Filho; BrasilFil: Rivas, Gustavo Adolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; ArgentinaFil: Bueno, Paulo Roberto. Universidade Estadual Paulista Julio de Mesquita Filho; BrasilRoyal Society of Chemistry2017-01-06info:eu-repo/semantics/articleinfo:eu-repo/semantics/publishedVersionhttp://purl.org/coar/resource_type/c_6501info:ar-repo/semantics/articuloapplication/pdfapplication/pdfapplication/pdfhttp://hdl.handle.net/11336/62331Gutierrez, Fabiana Andrea; Bedatty Fernandes, Flavio Cesar; Rivas, Gustavo Adolfo; Bueno, Paulo Roberto; Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisited; Royal Society of Chemistry; Physical Chemistry Chemical Physics; 19; 9; 6-1-2017; 6792-68061463-90761463-9084CONICET DigitalCONICETenginfo:eu-repo/semantics/altIdentifier/url/https://pubs.rsc.org/en/Content/ArticleLanding/2017/CP/C6CP07775Ginfo:eu-repo/semantics/altIdentifier/doi/10.1039/C6CP07775Ginfo:eu-repo/semantics/openAccesshttps://creativecommons.org/licenses/by-nc-sa/2.5/ar/reponame:CONICET Digital (CONICET)instname:Consejo Nacional de Investigaciones Científicas y Técnicas2025-09-29T10:26:23Zoai:ri.conicet.gov.ar:11336/62331instacron:CONICETInstitucionalhttp://ri.conicet.gov.ar/Organismo científico-tecnológicoNo correspondehttp://ri.conicet.gov.ar/oai/requestdasensio@conicet.gov.ar; lcarlino@conicet.gov.arArgentinaNo correspondeNo correspondeNo correspondeopendoar:34982025-09-29 10:26:24.143CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicasfalse |
dc.title.none.fl_str_mv |
Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisited |
title |
Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisited |
spellingShingle |
Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisited Gutierrez, Fabiana Andrea Mesoscopic Capacitance Electrostatic Effects Quantum Effects |
title_short |
Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisited |
title_full |
Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisited |
title_fullStr |
Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisited |
title_full_unstemmed |
Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisited |
title_sort |
Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisited |
dc.creator.none.fl_str_mv |
Gutierrez, Fabiana Andrea Bedatty Fernandes, Flavio Cesar Rivas, Gustavo Adolfo Bueno, Paulo Roberto |
author |
Gutierrez, Fabiana Andrea |
author_facet |
Gutierrez, Fabiana Andrea Bedatty Fernandes, Flavio Cesar Rivas, Gustavo Adolfo Bueno, Paulo Roberto |
author_role |
author |
author2 |
Bedatty Fernandes, Flavio Cesar Rivas, Gustavo Adolfo Bueno, Paulo Roberto |
author2_role |
author author author |
dc.subject.none.fl_str_mv |
Mesoscopic Capacitance Electrostatic Effects Quantum Effects |
topic |
Mesoscopic Capacitance Electrostatic Effects Quantum Effects |
purl_subject.fl_str_mv |
https://purl.org/becyt/ford/1.4 https://purl.org/becyt/ford/1 |
dc.description.none.fl_txt_mv |
The electronic density of states and its contribution to the capacitance of graphene compounds (oxidized and reduced) were investigated using an electrochemical impedance-derived capacitance spectroscopic approach. It is clearly demonstrated that graphene oxide, which is known to exhibit semiconductor electronic characteristics, has little influence on the magnitude of the measured capacitance. Moreover, when graphene oxide is electrochemically reduced to graphene, the capacitance increases dramatically by about three orders of magnitude (from microfaradays to millifaradays). This increased capacitive effect has been interpreted as being directly associated with the electrochemical non-faradaic (super- or ultracapacitive) characteristics of the interface (i.e. associated with its electroactive area, for instance). The results obtained and interpretation made in this work demonstrate that the magnitude of the measured capacitance is a consequence of an electrochemical capacitive phenomenon (mesoscopic in essence; thus, the associated capacitance is equivalently termed mesoscopic capacitance) that energetically contains, in series, both electrostatic (geometrical) and quantum effects, thus being essentially different from those exclusively related to the amount of existing interfacial sites for ions (i.e. beyond those associated with pure double-layer capacitive effects). Conceptually, it is proposed that the mesoscopic capacitance of reduced graphene can be explained mainly through quantum chemical effects, ultimately following first-principles quantum mechanics supported on density functional theory, wherein the density of states is central. Fil: Gutierrez, Fabiana Andrea. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil Fil: Bedatty Fernandes, Flavio Cesar. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil Fil: Rivas, Gustavo Adolfo. Consejo Nacional de Investigaciones Científicas y Técnicas. Centro Científico Tecnológico Conicet - Córdoba. Instituto de Investigaciones en Físico-química de Córdoba. Universidad Nacional de Córdoba. Facultad de Ciencias Químicas. Instituto de Investigaciones en Físico-química de Córdoba; Argentina Fil: Bueno, Paulo Roberto. Universidade Estadual Paulista Julio de Mesquita Filho; Brasil |
description |
The electronic density of states and its contribution to the capacitance of graphene compounds (oxidized and reduced) were investigated using an electrochemical impedance-derived capacitance spectroscopic approach. It is clearly demonstrated that graphene oxide, which is known to exhibit semiconductor electronic characteristics, has little influence on the magnitude of the measured capacitance. Moreover, when graphene oxide is electrochemically reduced to graphene, the capacitance increases dramatically by about three orders of magnitude (from microfaradays to millifaradays). This increased capacitive effect has been interpreted as being directly associated with the electrochemical non-faradaic (super- or ultracapacitive) characteristics of the interface (i.e. associated with its electroactive area, for instance). The results obtained and interpretation made in this work demonstrate that the magnitude of the measured capacitance is a consequence of an electrochemical capacitive phenomenon (mesoscopic in essence; thus, the associated capacitance is equivalently termed mesoscopic capacitance) that energetically contains, in series, both electrostatic (geometrical) and quantum effects, thus being essentially different from those exclusively related to the amount of existing interfacial sites for ions (i.e. beyond those associated with pure double-layer capacitive effects). Conceptually, it is proposed that the mesoscopic capacitance of reduced graphene can be explained mainly through quantum chemical effects, ultimately following first-principles quantum mechanics supported on density functional theory, wherein the density of states is central. |
publishDate |
2017 |
dc.date.none.fl_str_mv |
2017-01-06 |
dc.type.none.fl_str_mv |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion http://purl.org/coar/resource_type/c_6501 info:ar-repo/semantics/articulo |
format |
article |
status_str |
publishedVersion |
dc.identifier.none.fl_str_mv |
http://hdl.handle.net/11336/62331 Gutierrez, Fabiana Andrea; Bedatty Fernandes, Flavio Cesar; Rivas, Gustavo Adolfo; Bueno, Paulo Roberto; Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisited; Royal Society of Chemistry; Physical Chemistry Chemical Physics; 19; 9; 6-1-2017; 6792-6806 1463-9076 1463-9084 CONICET Digital CONICET |
url |
http://hdl.handle.net/11336/62331 |
identifier_str_mv |
Gutierrez, Fabiana Andrea; Bedatty Fernandes, Flavio Cesar; Rivas, Gustavo Adolfo; Bueno, Paulo Roberto; Mesoscopic behaviour of multi-layered graphene: The meaning of supercapacitance revisited; Royal Society of Chemistry; Physical Chemistry Chemical Physics; 19; 9; 6-1-2017; 6792-6806 1463-9076 1463-9084 CONICET Digital CONICET |
dc.language.none.fl_str_mv |
eng |
language |
eng |
dc.relation.none.fl_str_mv |
info:eu-repo/semantics/altIdentifier/url/https://pubs.rsc.org/en/Content/ArticleLanding/2017/CP/C6CP07775G info:eu-repo/semantics/altIdentifier/doi/10.1039/C6CP07775G |
dc.rights.none.fl_str_mv |
info:eu-repo/semantics/openAccess https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
eu_rights_str_mv |
openAccess |
rights_invalid_str_mv |
https://creativecommons.org/licenses/by-nc-sa/2.5/ar/ |
dc.format.none.fl_str_mv |
application/pdf application/pdf application/pdf |
dc.publisher.none.fl_str_mv |
Royal Society of Chemistry |
publisher.none.fl_str_mv |
Royal Society of Chemistry |
dc.source.none.fl_str_mv |
reponame:CONICET Digital (CONICET) instname:Consejo Nacional de Investigaciones Científicas y Técnicas |
reponame_str |
CONICET Digital (CONICET) |
collection |
CONICET Digital (CONICET) |
instname_str |
Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.name.fl_str_mv |
CONICET Digital (CONICET) - Consejo Nacional de Investigaciones Científicas y Técnicas |
repository.mail.fl_str_mv |
dasensio@conicet.gov.ar; lcarlino@conicet.gov.ar |
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1844614265452888064 |
score |
13.070432 |