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

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dc.contributor.advisorSuarez Herrera, Marco Fidel
dc.contributor.authorMoreno Piza, Oscar Javier
dc.contributor.researchgroupElectroquímica y Termodinámica Computacionalspa
dc.date.accessioned2023-07-07T21:02:53Z
dc.date.available2023-07-07T21:02:53Z
dc.date.issued2022
dc.descriptionilustracionesspa
dc.description.abstractLas 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)spa
dc.description.abstractThe 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.eng
dc.description.degreelevelMaestríaspa
dc.description.degreenameMagíster en Ciencias - Químicaspa
dc.description.researchareaMateriales y Energíaspa
dc.format.extentxxi, 69 páginasspa
dc.format.mimetypeapplication/pdfspa
dc.identifier.instnameUniversidad Nacional de Colombiaspa
dc.identifier.reponameRepositorio Institucional Universidad Nacional de Colombiaspa
dc.identifier.repourlhttps://repositorio.unal.edu.co/spa
dc.identifier.urihttps://repositorio.unal.edu.co/handle/unal/84171
dc.language.isospaspa
dc.publisherUniversidad Nacional de Colombiaspa
dc.publisher.branchUniversidad Nacional de Colombia - Sede Bogotáspa
dc.publisher.facultyFacultad de Cienciasspa
dc.publisher.placeBogotá, Colombiaspa
dc.publisher.programBogotá - Ciencias - Maestría en Ciencias - Químicaspa
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dc.relation.referencesH. Liu, M.N. Radford, C. Yang, W. Chen, M. Xian, Inorganic hydrogen polysulfides: chemistry, chemical biology and detection, British Journal of Pharmacology. 176 (2019) 616–627. https://doi.org/10.1111/bph.14330spa
dc.rights.accessrightsinfo:eu-repo/semantics/openAccessspa
dc.rights.licenseAtribución-SinDerivadas 4.0 Internacionalspa
dc.rights.urihttp://creativecommons.org/licenses/by-nd/4.0/spa
dc.subject.ddc540 - Química y ciencias afines::541 - Química físicaspa
dc.subject.proposalElectroquímica del azufrespa
dc.subject.proposalElectrocatálisisspa
dc.subject.proposalBaterías de azufre-litiospa
dc.subject.proposalPolímeros conductoresspa
dc.subject.proposalLíquidos iónicosspa
dc.subject.proposalElectrochemistry of sulfureng
dc.subject.proposalElectrocatalysiseng
dc.subject.proposalSulfur-lithium batterieseng
dc.subject.proposalconductive polymerseng
dc.subject.proposalIonic liquids.eng
dc.titleEstudio 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 soportespa
dc.title.translatedElectrochemical 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 electrolyteseng
dc.typeTrabajo de grado - Maestríaspa
dc.type.coarhttp://purl.org/coar/resource_type/c_bdccspa
dc.type.coarversionhttp://purl.org/coar/version/c_ab4af688f83e57aaspa
dc.type.contentTextspa
dc.type.driverinfo:eu-repo/semantics/masterThesisspa
dc.type.redcolhttp://purl.org/redcol/resource_type/TMspa
dc.type.versioninfo:eu-repo/semantics/acceptedVersionspa
dcterms.audience.professionaldevelopmentInvestigadoresspa
oaire.accessrightshttp://purl.org/coar/access_right/c_abf2spa
oaire.awardtitleEstudio 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.spa
oaire.fundernameFundación para la promoción de la ciencia y tecnología del banco de la repúblicaspa

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