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Electrochemical Behavior of Symmetric Electrical Double-Layer Capacitors and Pseudocapacitors and Identification of Transport Anomalies in the Interconnected Ionic and Electronic Phases Using the Impedance Technique.
Nunes, Willian G; Pascon, Aline M; Freitas, Bruno; De Sousa, Lindomar G; Franco, Débora V; Zanin, Hudson; Da Silva, Leonardo M.
Afiliação
  • Nunes WG; Carbon Sci-Tech Labs, Center for Innovation on New Energies, Advanced Energy Storage Division, School of Electrical and Computer Engineering, University of Campinas, Av. Albert Einstein 400, Campinas 13083-852, SP, Brazil.
  • Pascon AM; Carbon Sci-Tech Labs, Center for Innovation on New Energies, Advanced Energy Storage Division, School of Electrical and Computer Engineering, University of Campinas, Av. Albert Einstein 400, Campinas 13083-852, SP, Brazil.
  • Freitas B; Carbon Sci-Tech Labs, Center for Innovation on New Energies, Advanced Energy Storage Division, School of Electrical and Computer Engineering, University of Campinas, Av. Albert Einstein 400, Campinas 13083-852, SP, Brazil.
  • De Sousa LG; Laboratory of Fundamental and Applied Electrochemistry, Department of Chemistry, Federal University of Jequitinhonha e Mucuri's Valley, Rodovia MGT 367, Km 583, n° 5000, Alto da Jacuba, Diamantina 39100-000, MG, Brazil.
  • Franco DV; Laboratory of Fundamental and Applied Electrochemistry, Department of Chemistry, Federal University of Jequitinhonha e Mucuri's Valley, Rodovia MGT 367, Km 583, n° 5000, Alto da Jacuba, Diamantina 39100-000, MG, Brazil.
  • Zanin H; Carbon Sci-Tech Labs, Center for Innovation on New Energies, Advanced Energy Storage Division, School of Electrical and Computer Engineering, University of Campinas, Av. Albert Einstein 400, Campinas 13083-852, SP, Brazil.
  • Da Silva LM; Laboratory of Fundamental and Applied Electrochemistry, Department of Chemistry, Federal University of Jequitinhonha e Mucuri's Valley, Rodovia MGT 367, Km 583, n° 5000, Alto da Jacuba, Diamantina 39100-000, MG, Brazil.
Nanomaterials (Basel) ; 12(4)2022 Feb 18.
Article em En | MEDLINE | ID: mdl-35215004
A double-channel transmission line impedance model was applied to the study of supercapacitors to investigate the charge transport characteristics in the ionic and electronic conductors forming the electrode/solution interface. The macro homogeneous description of two closely mixed phases (Paasch-Micka-Gersdorf model) was applied to study the influence of disordered materials on the charge transport anomalies during the interfacial charge-discharge process. Different ex situ techniques were used to characterize the electrode materials used in electrical double-layer (EDLC) and pseudocapacitor (PC) devices. Two time constants in the impedance model were adequate to represent the charge transport in the different phases. The interfacial impedance considering frequency dispersion and blocked charge transfer conditions adequately described the charge storage at the interface. Deviations from the normal (Fickian) transport involving the ionic and electronic charge carriers were identified by the dispersive parameters (e.g., n and s exponents) used in the impedance model. The ionic and electronic transports were affected when the carbon-based electrical double-layer capacitor was converted into a composite with strong pseudocapacitive characteristics after the decoration process using NiO. The overall capacitance increased from 2.62 F g-1 to 536 F g-1 after the decoration. For the first time, the charge transport anomalies were unequivocally identified in porous materials used in supercapacitors with the impedance technique.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Diagnostic_studies / Prognostic_studies Idioma: En Revista: Nanomaterials (Basel) Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Brasil País de publicação: Suíça
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Tipo de estudo: Diagnostic_studies / Prognostic_studies Idioma: En Revista: Nanomaterials (Basel) Ano de publicação: 2022 Tipo de documento: Article País de afiliação: Brasil País de publicação: Suíça