Estudio de los procesos redox del azufre elemental en solventes orgánicos usando carbón vítreo modificado con PEDOT (3,4-etilén-dioxi-tiofeno) y líquidos iónicos como electrolitos de soporte

ilustraciones

Autores:
Moreno Piza, Oscar Javier
Tipo de recurso:
Fecha de publicación:
2022
Institución:
Universidad Nacional de Colombia
Repositorio:
Universidad Nacional de Colombia
Idioma:
spa
OAI Identifier:
oai:repositorio.unal.edu.co:unal/84171
Acceso en línea:
https://repositorio.unal.edu.co/handle/unal/84171
https://repositorio.unal.edu.co/
Palabra clave:
540 - Química y ciencias afines::541 - Química física
Electroquímica del azufre
Electrocatálisis
Baterías de azufre-litio
Polímeros conductores
Líquidos iónicos
Electrochemistry of sulfur
Electrocatalysis
Sulfur-lithium batteries
conductive polymers
Ionic liquids.
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openAccess
License
Atribución-SinDerivadas 4.0 Internacional
id UNACIONAL2_6f4fcf029a8822a854d16a87dfe4c0ec
oai_identifier_str oai:repositorio.unal.edu.co:unal/84171
network_acronym_str UNACIONAL2
network_name_str Universidad Nacional de Colombia
repository_id_str
dc.title.spa.fl_str_mv Estudio de los procesos redox del azufre elemental en solventes orgánicos usando carbón vítreo modificado con PEDOT (3,4-etilén-dioxi-tiofeno) y líquidos iónicos como electrolitos de soporte
dc.title.translated.eng.fl_str_mv Electrochemical study of the redox processes of elemental sulfur in organic solvents using poly (3,4-ethylene-dioxy-thiophene) modified glassy carbon electrodes as working electrodes and ionic liquids as electrolytes
title Estudio de los procesos redox del azufre elemental en solventes orgánicos usando carbón vítreo modificado con PEDOT (3,4-etilén-dioxi-tiofeno) y líquidos iónicos como electrolitos de soporte
spellingShingle Estudio de los procesos redox del azufre elemental en solventes orgánicos usando carbón vítreo modificado con PEDOT (3,4-etilén-dioxi-tiofeno) y líquidos iónicos como electrolitos de soporte
540 - Química y ciencias afines::541 - Química física
Electroquímica del azufre
Electrocatálisis
Baterías de azufre-litio
Polímeros conductores
Líquidos iónicos
Electrochemistry of sulfur
Electrocatalysis
Sulfur-lithium batteries
conductive polymers
Ionic liquids.
title_short Estudio de los procesos redox del azufre elemental en solventes orgánicos usando carbón vítreo modificado con PEDOT (3,4-etilén-dioxi-tiofeno) y líquidos iónicos como electrolitos de soporte
title_full Estudio de los procesos redox del azufre elemental en solventes orgánicos usando carbón vítreo modificado con PEDOT (3,4-etilén-dioxi-tiofeno) y líquidos iónicos como electrolitos de soporte
title_fullStr Estudio de los procesos redox del azufre elemental en solventes orgánicos usando carbón vítreo modificado con PEDOT (3,4-etilén-dioxi-tiofeno) y líquidos iónicos como electrolitos de soporte
title_full_unstemmed Estudio de los procesos redox del azufre elemental en solventes orgánicos usando carbón vítreo modificado con PEDOT (3,4-etilén-dioxi-tiofeno) y líquidos iónicos como electrolitos de soporte
title_sort Estudio de los procesos redox del azufre elemental en solventes orgánicos usando carbón vítreo modificado con PEDOT (3,4-etilén-dioxi-tiofeno) y líquidos iónicos como electrolitos de soporte
dc.creator.fl_str_mv Moreno Piza, Oscar Javier
dc.contributor.advisor.none.fl_str_mv Suarez Herrera, Marco Fidel
dc.contributor.author.none.fl_str_mv Moreno Piza, Oscar Javier
dc.contributor.researchgroup.spa.fl_str_mv Electroquímica y Termodinámica Computacional
dc.subject.ddc.spa.fl_str_mv 540 - Química y ciencias afines::541 - Química física
topic 540 - Química y ciencias afines::541 - Química física
Electroquímica del azufre
Electrocatálisis
Baterías de azufre-litio
Polímeros conductores
Líquidos iónicos
Electrochemistry of sulfur
Electrocatalysis
Sulfur-lithium batteries
conductive polymers
Ionic liquids.
dc.subject.proposal.spa.fl_str_mv Electroquímica del azufre
Electrocatálisis
Baterías de azufre-litio
Polímeros conductores
Líquidos iónicos
dc.subject.proposal.eng.fl_str_mv Electrochemistry of sulfur
Electrocatalysis
Sulfur-lithium batteries
conductive polymers
Ionic liquids.
description ilustraciones
publishDate 2022
dc.date.issued.none.fl_str_mv 2022
dc.date.accessioned.none.fl_str_mv 2023-07-07T21:02:53Z
dc.date.available.none.fl_str_mv 2023-07-07T21:02:53Z
dc.type.spa.fl_str_mv Trabajo de grado - Maestría
dc.type.driver.spa.fl_str_mv info:eu-repo/semantics/masterThesis
dc.type.version.spa.fl_str_mv info:eu-repo/semantics/acceptedVersion
dc.type.content.spa.fl_str_mv Text
dc.type.redcol.spa.fl_str_mv http://purl.org/redcol/resource_type/TM
status_str acceptedVersion
dc.identifier.uri.none.fl_str_mv https://repositorio.unal.edu.co/handle/unal/84171
dc.identifier.instname.spa.fl_str_mv Universidad Nacional de Colombia
dc.identifier.reponame.spa.fl_str_mv Repositorio Institucional Universidad Nacional de Colombia
dc.identifier.repourl.spa.fl_str_mv https://repositorio.unal.edu.co/
url https://repositorio.unal.edu.co/handle/unal/84171
https://repositorio.unal.edu.co/
identifier_str_mv Universidad Nacional de Colombia
Repositorio Institucional Universidad Nacional de Colombia
dc.language.iso.spa.fl_str_mv spa
language spa
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dc.format.extent.spa.fl_str_mv xxi, 69 páginas
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dc.publisher.spa.fl_str_mv Universidad Nacional de Colombia
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dc.publisher.branch.spa.fl_str_mv Universidad Nacional de Colombia - Sede Bogotá
institution Universidad Nacional de Colombia
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spelling Atribución-SinDerivadas 4.0 Internacionalhttp://creativecommons.org/licenses/by-nd/4.0/info:eu-repo/semantics/openAccesshttp://purl.org/coar/access_right/c_abf2Suarez Herrera, Marco Fidelbd5855fa56b4f38160dad3196b07ddd2Moreno Piza, Oscar Javierc1494e9db2119e338e77f8382e6bab16Electroquímica y Termodinámica Computacional2023-07-07T21:02:53Z2023-07-07T21:02:53Z2022https://repositorio.unal.edu.co/handle/unal/84171Universidad Nacional de ColombiaRepositorio Institucional Universidad Nacional de Colombiahttps://repositorio.unal.edu.co/ilustracionesLas baterías de litio-azufre han sido foco de estudio durante varios años, sin embargo, su implementación se ha visto limitada debido a su corta vida útil debido al efecto ‘suttle’, el cual se debe al transporte de los polisulfuros hacia el ánodo formando depósitos altamente resistivos que pasivan los electrodos. Este inconveniente puede solucionarse al restringir los procesos de transporte de estas especies desde el cátodo al ánodo y al mismo tiempo mejorar la cinética de transferencia de carga de las reacciones electroquímicas. Este trabajo de investigación estudia las reacciones redox del azufre elemental en acetonitrilo (CH3CN) y dimetilsulfóxido (DMSO) sobre electrodos de trabajo de carbón vítreo y carbón vítreo modificado con una lámina delgada de poli(3,4-etilenodioxitiofeno) (PEDOT) empleando voltamperometría cíclica, voltamperometría ac y espectroscopia de impedancia electroquímica. Como electrolitos se emplearon hexafluorofosfato de tetrabutilamonio (TBAPF6), 1-Butil-3-metilimidazolio tetrafluoroborato ([Bmim][BF4]) y 1-Butil-3-metilimidazolio triflato ([Bmim][OTf]). Se encontró que la cinética de transferencia de carga para la primera reacción de reducción del S8 sobre carbón vítreo es más rápido en CH3CN que en DMSO y cuando [Bmim][OTf] se usa como electrolito. Por otro lado, se encontró que el PEDOT es electrocatalítico para la primera reacción de reducción del azufre elemental. Finalmente, al encapsular el azufre entre láminas de PEDOT es posible aumentar el tiempo de retención de las especies de azufre al interior del PEDOT bajo ciclos sucesivos de oxido-reducción si se usan líquidos iónicos puros como electrolitos (Texto tomado de la fuente)The commercial use of Lithium-sulfur batteries has been limited by their short service life due to the shuttle effect of polysulfides, which is due the transport of polysulfides towards the anode and the formation of highly resistive deposits that passivate the electrodes. This problem can be solved by decreasing the transport of these species from the cathode to the anode and improving at the same time the kinetics of electron transfer reactions. This work studies by electrochemical impedance spectroscopy and cyclic and ac voltammetry the redox reactions of elemental sulfur in either acetonitrile (CH3CN) or Dimethyl sulfoxide (DMSO) using as a working electrode either pristine glassy carbon (GC) or GC modified with a thin film of Poly 3,4-ethylenedioxythiophene (GC-PEDOT) as working electrodes. As electrolytes were studied tetrabutylammonium hexafluorophosphate (TBAPF6), 1-Butyl-3-methylimidazolium tetrafluoroborate ([Bmim][BF4]) and 1-Butyl-3-methylimidazolium triflate ([Bmim][OTf]). It was found that the kinetics of the first reduction reaction of S8 on GC is much faster in CH3CN than in DMSO and when [Bmim][OTf] is used as electrolyte. On the other hand, it was found that PEDOT is electrocatalytic for the first reduction reaction of elemental sulfur. Finally, by encapsulating the sulfur in PEDOT it is possible to increase the retention of the sulfur species inside PEDOT upon redox cycling if pure ionic liquids are used as electrolytes.MaestríaMagíster en Ciencias - QuímicaMateriales y Energíaxxi, 69 páginasapplication/pdfspaUniversidad Nacional de ColombiaBogotá - Ciencias - Maestría en Ciencias - QuímicaFacultad de CienciasBogotá, ColombiaUniversidad Nacional de Colombia - Sede Bogotá540 - Química y ciencias afines::541 - Química físicaElectroquímica del azufreElectrocatálisisBaterías de azufre-litioPolímeros conductoresLíquidos iónicosElectrochemistry of sulfurElectrocatalysisSulfur-lithium batteriesconductive polymersIonic liquids.Estudio de los procesos redox del azufre elemental en solventes orgánicos usando carbón vítreo modificado con PEDOT (3,4-etilén-dioxi-tiofeno) y líquidos iónicos como electrolitos de soporteElectrochemical study of the redox processes of elemental sulfur in organic solvents using poly (3,4-ethylene-dioxy-thiophene) modified glassy carbon electrodes as working electrodes and ionic liquids as electrolytesTrabajo de grado - Maestríainfo:eu-repo/semantics/masterThesisinfo:eu-repo/semantics/acceptedVersionTexthttp://purl.org/redcol/resource_type/TMC.-E. 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Xian, Inorganic hydrogen polysulfides: chemistry, chemical biology and detection, British Journal of Pharmacology. 176 (2019) 616–627. https://doi.org/10.1111/bph.14330Estudio de los procesos redox de azufre elemental en solventes orgánicos cuando se utilizan líquidos iónicos como electrolitos y electrodos de carbón vítreo modificados con Poli (3,4-etilén-dioxi- tiofeno) como electrodos de trabajo.Fundación para la promoción de la ciencia y tecnología del banco de la repúblicaInvestigadoresORIGINAL1073518865.2022.pdf1073518865.2022.pdfMaestría en Ciencias - Químicaapplication/pdf2562211https://repositorio.unal.edu.co/bitstream/unal/84171/5/1073518865.2022.pdf4fe6ad425e20d9c1bcb65c8625369c6eMD55LICENSElicense.txtlicense.txttext/plain; charset=utf-85879https://repositorio.unal.edu.co/bitstream/unal/84171/4/license.txteb34b1cf90b7e1103fc9dfd26be24b4aMD54THUMBNAIL1073518865.2022.pdf.jpg1073518865.2022.pdf.jpgGenerated 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