Toward enhanced supercapacitors by mutually adapting electrolytes and nanoporous carbons

Tesis Doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Química Física Aplicada. Fecha de lectura: 05-03-2019

Detalles Bibliográficos
Autor: Redondo Negrete, Edurne
Tipo de recurso: tesis doctoral
Fecha de publicación:2019
País:España
Institución:Universidad Autónoma de Madrid
Repositorio:Biblos-e Archivo. Repositorio Institucional de la UAM
Idioma:inglés
OAI Identifier:oai:repositorio.uam.es:10486/687488
Acceso en línea:http://hdl.handle.net/10486/687488
Access Level:acceso abierto
Palabra clave:Almacenamiento de energía - Tesis doctorales
Electroquímica - Tesis doctorales
Condensadores (Electricidad) - Tesis doctorales
Química
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spelling Toward enhanced supercapacitors by mutually adapting electrolytes and nanoporous carbonsRedondo Negrete, EdurneAlmacenamiento de energía - Tesis doctoralesElectroquímica - Tesis doctoralesCondensadores (Electricidad) - Tesis doctoralesQuímicaTesis Doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Química Física Aplicada. Fecha de lectura: 05-03-2019Electrochemical capacitors are energy storage systems able to be fully charged and discharged within seconds. Because of their high power density and long cyclability, they are interesting devices for implementing them in many modern applications including the electric vehicle. They are most commonly made of high surface area carbonaceous active materials. This work presents the use of microporous carbons derived from olive pits, an abundant natural waste material in Spain, in order to produce active materials for electric double layer capacitors (EDLCs) and lithium and sodium ion capacitors (LICs and NICs, respectively). The synthesis conditions of the chemical activation process (temperature and KOH amount) have been adapted to prepare activated carbons (ACs) with improved electrochemical performance. Therefore, in aqueous 6M KOH electrolyte, the maximum gravimetric and volumetric capacitance values achieved are 260 F g-1 and 140 F cm-3 and in organic 1.5M (C2H5)4NBF4 organic electrolyte, the values are 150 F g-1 and 65 F cm-3, respectively. Furthermore, the relationship between capacitance and the complex interplay of the accessible specific surface area, the accessible average pore size and the effective dielectric permittivity have been studied, suggesting that moderately solvated ions enhance the high-rate capability in pores that slightly exceed the solvated ion size. These ACs have also been used as active materials in more exploratory type of electrolytes, such as, aqueous neutral salts and ionic liquids (ILs). ACs working in 6M LiCl electrolyte have demonstrated to be able to provide a capacitance value of 160 F g-1 in a voltage window of 1.6 V with very low resistance thanks to the high conductivity of the electrolyte at high salt concentration values. Similarly, when these mesopore-free ACs operate in neat EMITFSI IL, they are able to give gravimetric and volumetric capacitance values as high as 180 F g-1 and 150 F cm-3 within a cell voltage of 3V, respectively, due to the adaptation of the pore size to the ion size. Finally, LIC and NIC devices have also been built using the hard carbon directly obtained from the pyrolysis of the olive pits in the negative electrode and previously mentioned ACs in the positive electrode. These LIC and NIC devices overcome their EDLC counterpart in terms of energy density throughout the studied power density range while keeping the cyclability exhibited by EDLCs, which opens up the range of possible applications for these devices.Mysyk, RomanGoikolea, EiderDepartamento de Química Física AplicadaFacultad de Ciencias20192019-03-05doctoral thesishttp://purl.org/coar/resource_type/c_db06NAhttp://purl.org/coar/version/c_be7fb7dd8ff6fe43info:eu-repo/semantics/doctoralThesisapplication/pdfhttp://hdl.handle.net/10486/687488reponame:Biblos-e Archivo. Repositorio Institucional de la UAMinstname:Universidad Autónoma de MadridInglésengopen accesshttp://purl.org/coar/access_right/c_abf2info:eu-repo/semantics/openAccessoai:repositorio.uam.es:10486/6874882026-06-23T12:46:27Z
dc.title.none.fl_str_mv Toward enhanced supercapacitors by mutually adapting electrolytes and nanoporous carbons
title Toward enhanced supercapacitors by mutually adapting electrolytes and nanoporous carbons
spellingShingle Toward enhanced supercapacitors by mutually adapting electrolytes and nanoporous carbons
Redondo Negrete, Edurne
Almacenamiento de energía - Tesis doctorales
Electroquímica - Tesis doctorales
Condensadores (Electricidad) - Tesis doctorales
Química
title_short Toward enhanced supercapacitors by mutually adapting electrolytes and nanoporous carbons
title_full Toward enhanced supercapacitors by mutually adapting electrolytes and nanoporous carbons
title_fullStr Toward enhanced supercapacitors by mutually adapting electrolytes and nanoporous carbons
title_full_unstemmed Toward enhanced supercapacitors by mutually adapting electrolytes and nanoporous carbons
title_sort Toward enhanced supercapacitors by mutually adapting electrolytes and nanoporous carbons
dc.creator.none.fl_str_mv Redondo Negrete, Edurne
author Redondo Negrete, Edurne
author_facet Redondo Negrete, Edurne
author_role author
dc.contributor.none.fl_str_mv Mysyk, Roman
Goikolea, Eider
Departamento de Química Física Aplicada
Facultad de Ciencias
dc.subject.none.fl_str_mv Almacenamiento de energía - Tesis doctorales
Electroquímica - Tesis doctorales
Condensadores (Electricidad) - Tesis doctorales
Química
topic Almacenamiento de energía - Tesis doctorales
Electroquímica - Tesis doctorales
Condensadores (Electricidad) - Tesis doctorales
Química
description Tesis Doctoral inédita leída en la Universidad Autónoma de Madrid, Facultad de Ciencias, Departamento de Química Física Aplicada. Fecha de lectura: 05-03-2019
publishDate 2019
dc.date.none.fl_str_mv 2019
2019-03-05
dc.type.none.fl_str_mv doctoral thesis
http://purl.org/coar/resource_type/c_db06
NA
http://purl.org/coar/version/c_be7fb7dd8ff6fe43
dc.type.openaire.fl_str_mv info:eu-repo/semantics/doctoralThesis
format doctoralThesis
dc.identifier.none.fl_str_mv http://hdl.handle.net/10486/687488
url http://hdl.handle.net/10486/687488
dc.language.none.fl_str_mv Inglés
eng
language_invalid_str_mv Inglés
language eng
dc.rights.none.fl_str_mv open access
http://purl.org/coar/access_right/c_abf2
dc.rights.openaire.fl_str_mv info:eu-repo/semantics/openAccess
rights_invalid_str_mv open access
http://purl.org/coar/access_right/c_abf2
eu_rights_str_mv openAccess
dc.format.none.fl_str_mv application/pdf
dc.source.none.fl_str_mv reponame:Biblos-e Archivo. Repositorio Institucional de la UAM
instname:Universidad Autónoma de Madrid
instname_str Universidad Autónoma de Madrid
reponame_str Biblos-e Archivo. Repositorio Institucional de la UAM
collection Biblos-e Archivo. Repositorio Institucional de la UAM
repository.name.fl_str_mv
repository.mail.fl_str_mv
_version_ 1869425527498997760
score 15,300724

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