Electrochemical and Computational Studies on the Electrocatalytic Effect of Conducting Polymers toward the Redox Reactions of Thiadiazole-Based Thiolate Compounds

Handle URI:
http://hdl.handle.net/10754/598133
Title:
Electrochemical and Computational Studies on the Electrocatalytic Effect of Conducting Polymers toward the Redox Reactions of Thiadiazole-Based Thiolate Compounds
Authors:
Rodríguez-Calero, Gabriel G.; Lowe, Michael A.; Kiya, Yasuyuki; Abruña, Héctor D.
Abstract:
We have studied the electrocatalytic effects of polythiophene-based conducting polymers toward the redox reactions of the dilithium salt of the thiadiazole-based dithiol compound 2,5-dimercapto-1,3,4-thiodiazole (DMcT-2Li) via cyclic voltammetry (CV), rotating-disk electrode voltammetry, and electrochemical impedance spectroscopy (EIS). We have found that the electrocatalytic activity of the conducting polymers is strongly influenced by the potential range over which the polymers are electrically conductive (i.e., window of conductivity), which was tuned by employing different electron-donating groups at the 3- or 3,4-positions of polythiophene (PTh). Both poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(3,4-propylenedioxythiophene) (PProDOT), whose windows of conductivity exhibited a good overlap with the formal potential for the dimerization process of DMcT-2Li; E0′ d (?0.54 V versus Ag/Ag+) exhibited electrocatalytic activity toward both the oxidation and reduction processes of DMcT-2Li. On the other hand, PTh, poly(3-methylthiophene) (PMTh), and poly(3,4- dimethoxythiophene) (PDMTh), whose windows of conductivity did not overlap with E0′d, did not exhibit electrocatalytic activity. The standard charge transfer rate constants for the dimerization process of DMcT-2Li at PEDOT, PProDOT, and PDMTh film-modified glassy carbon electrodes (GCEs) were estimated to be 7.4 - 10?4, 3.2 - 10?4, and 6.9 - 10?5 cm/s while the rate constant was 6.3 - 10?5 cm/s at an unmodified GCE. Moreover, EIS studies for PEDOT, PProDOT, and PDMTh film-modified GCEs indicated the smallest charge transfer resistance for a PEDOT film and highest for a PDMTh film at E0′d, indicating that the higher the electrical conductivity of a film at E 0′d the higher the electrocatalytic activity toward the redox reactions of DMcT-2Li. These results clearly indicate that in order to accelerate the redox reactions of DMcT-2Li (and likely of other organosulfur compounds) the window of conductivity of a conducting polymer needs to overlap the formal potentials of the organosulfur compounds and, thus, support our previous observations that the electrocatalytic reactions proceed via electron exchange reactions between DMcT-2Li and conducting polymers such as PEDOT. Additional computational results for oligomers of PEDOT, ProDOT, and PDMTh showed that substituents at the 3,4-positions of the thiophene ring influence the window of conductivity via steric and electronic effects. This study provides important insights toward rational design of novel conducting-polymer- based electrocatalysts to enable organosulfur compounds to be of practical use as cathode materials for lithium-ion rechargeable batteries. © 2010 American Chemical Society.
Citation:
Rodríguez-Calero GG, Lowe MA, Kiya Y, Abruña HD (2010) Electrochemical and Computational Studies on the Electrocatalytic Effect of Conducting Polymers toward the Redox Reactions of Thiadiazole-Based Thiolate Compounds. The Journal of Physical Chemistry C 114: 6169–6176. Available: http://dx.doi.org/10.1021/jp9076504.
Publisher:
American Chemical Society (ACS)
Journal:
The Journal of Physical Chemistry C
Issue Date:
8-Apr-2010
DOI:
10.1021/jp9076504
Type:
Article
ISSN:
1932-7447; 1932-7455
Sponsors:
This work was supported by the Research Experience for Undergraduates (REU) program of Cornell Center for Materials Research (DMR-0520404), the King Abdullah University of Science and Technology Cornell University (KAUST-CU) Center for Research and Education, and Fuji Heavy Industries, Ltd. (FHI). Y.K. is grateful to Dr. Burak Ulgilt (CU) and Dr. Futoshi Matsumoto (CU) for helpful discussions on the EIS studies. M.L. is grateful to Stephen Burkhardt (CU) for helpful discussions.
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Full metadata record

DC FieldValue Language
dc.contributor.authorRodríguez-Calero, Gabriel G.en
dc.contributor.authorLowe, Michael A.en
dc.contributor.authorKiya, Yasuyukien
dc.contributor.authorAbruña, Héctor D.en
dc.date.accessioned2016-02-25T13:13:18Zen
dc.date.available2016-02-25T13:13:18Zen
dc.date.issued2010-04-08en
dc.identifier.citationRodríguez-Calero GG, Lowe MA, Kiya Y, Abruña HD (2010) Electrochemical and Computational Studies on the Electrocatalytic Effect of Conducting Polymers toward the Redox Reactions of Thiadiazole-Based Thiolate Compounds. The Journal of Physical Chemistry C 114: 6169–6176. Available: http://dx.doi.org/10.1021/jp9076504.en
dc.identifier.issn1932-7447en
dc.identifier.issn1932-7455en
dc.identifier.doi10.1021/jp9076504en
dc.identifier.urihttp://hdl.handle.net/10754/598133en
dc.description.abstractWe have studied the electrocatalytic effects of polythiophene-based conducting polymers toward the redox reactions of the dilithium salt of the thiadiazole-based dithiol compound 2,5-dimercapto-1,3,4-thiodiazole (DMcT-2Li) via cyclic voltammetry (CV), rotating-disk electrode voltammetry, and electrochemical impedance spectroscopy (EIS). We have found that the electrocatalytic activity of the conducting polymers is strongly influenced by the potential range over which the polymers are electrically conductive (i.e., window of conductivity), which was tuned by employing different electron-donating groups at the 3- or 3,4-positions of polythiophene (PTh). Both poly(3,4-ethylenedioxythiophene) (PEDOT) and poly(3,4-propylenedioxythiophene) (PProDOT), whose windows of conductivity exhibited a good overlap with the formal potential for the dimerization process of DMcT-2Li; E0′ d (?0.54 V versus Ag/Ag+) exhibited electrocatalytic activity toward both the oxidation and reduction processes of DMcT-2Li. On the other hand, PTh, poly(3-methylthiophene) (PMTh), and poly(3,4- dimethoxythiophene) (PDMTh), whose windows of conductivity did not overlap with E0′d, did not exhibit electrocatalytic activity. The standard charge transfer rate constants for the dimerization process of DMcT-2Li at PEDOT, PProDOT, and PDMTh film-modified glassy carbon electrodes (GCEs) were estimated to be 7.4 - 10?4, 3.2 - 10?4, and 6.9 - 10?5 cm/s while the rate constant was 6.3 - 10?5 cm/s at an unmodified GCE. Moreover, EIS studies for PEDOT, PProDOT, and PDMTh film-modified GCEs indicated the smallest charge transfer resistance for a PEDOT film and highest for a PDMTh film at E0′d, indicating that the higher the electrical conductivity of a film at E 0′d the higher the electrocatalytic activity toward the redox reactions of DMcT-2Li. These results clearly indicate that in order to accelerate the redox reactions of DMcT-2Li (and likely of other organosulfur compounds) the window of conductivity of a conducting polymer needs to overlap the formal potentials of the organosulfur compounds and, thus, support our previous observations that the electrocatalytic reactions proceed via electron exchange reactions between DMcT-2Li and conducting polymers such as PEDOT. Additional computational results for oligomers of PEDOT, ProDOT, and PDMTh showed that substituents at the 3,4-positions of the thiophene ring influence the window of conductivity via steric and electronic effects. This study provides important insights toward rational design of novel conducting-polymer- based electrocatalysts to enable organosulfur compounds to be of practical use as cathode materials for lithium-ion rechargeable batteries. © 2010 American Chemical Society.en
dc.description.sponsorshipThis work was supported by the Research Experience for Undergraduates (REU) program of Cornell Center for Materials Research (DMR-0520404), the King Abdullah University of Science and Technology Cornell University (KAUST-CU) Center for Research and Education, and Fuji Heavy Industries, Ltd. (FHI). Y.K. is grateful to Dr. Burak Ulgilt (CU) and Dr. Futoshi Matsumoto (CU) for helpful discussions on the EIS studies. M.L. is grateful to Stephen Burkhardt (CU) for helpful discussions.en
dc.publisherAmerican Chemical Society (ACS)en
dc.titleElectrochemical and Computational Studies on the Electrocatalytic Effect of Conducting Polymers toward the Redox Reactions of Thiadiazole-Based Thiolate Compoundsen
dc.typeArticleen
dc.identifier.journalThe Journal of Physical Chemistry Cen
dc.contributor.institutionUniversity of Puerto Rico, San Juan, Puerto Ricoen
dc.contributor.institutionCornell University, Ithaca, United Statesen
dc.contributor.institutionSubaru Research and Development Inc., Ann Arbor, United Statesen
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