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New Insights on the Sodium Water-in-Salt Electrolyte and Carbon Electrode Interface from Electrochemistry and Operando Raman Studies.
Vicentini, Rafael; Venâncio, Raissa; Nunes, Willian; Da Silva, Leonardo Morais; Zanin, Hudson.
Afiliação
  • Vicentini R; Advanced Energy Storage Division, Center for Innovation on New Energies, Carbon Sci-Tech Labs and Manufacturing Group, School of Electrical and Computer Engineering, University of Campinas, Av. Albert Einstein 400, Campinas, SP 13083-852, Brazil.
  • Venâncio R; Advanced Energy Storage Division, Center for Innovation on New Energies, Carbon Sci-Tech Labs and Manufacturing Group, School of Electrical and Computer Engineering, University of Campinas, Av. Albert Einstein 400, Campinas, SP 13083-852, Brazil.
  • Nunes W; Advanced Energy Storage Division, Center for Innovation on New Energies, Carbon Sci-Tech Labs and Manufacturing Group, School of Electrical and Computer Engineering, University of Campinas, Av. Albert Einstein 400, Campinas, SP 13083-852, Brazil.
  • Da Silva LM; Department of Chemistry, Laboratory of Fundamental and Applied Electrochemistry, Federal University of Jequitinhonha and Mucuri's Valley, Rodovia MGT 367, km 583, 5000, Alto da Jacuba, Diamantina, MG 39100-000, Brazil.
  • Zanin H; Advanced Energy Storage Division, Center for Innovation on New Energies, Carbon Sci-Tech Labs and Manufacturing Group, School of Electrical and Computer Engineering, University of Campinas, Av. Albert Einstein 400, Campinas, SP 13083-852, Brazil.
ACS Appl Mater Interfaces ; 13(51): 61139-61153, 2021 Dec 29.
Article em En | MEDLINE | ID: mdl-34915700
Comprehensive electrochemical and operando Raman studies are performed to investigate the electrochemical stability window (ESW) of supercapacitors filled with normal (salt-in-water) and highly concentrated (water-in-salt, WiSE) electrolytes. Impedance and chronoamperometric experiments are employed and combined with cyclic voltammetry to correctly define the ESW for a WiSE-based device. The total absence of water-splitting resulted in phase angles close to -90° in the impedance data. It is verified that a 17 m NaClO4 electrolyte avoids the water-splitting up to 1.8 V. Furthermore, Raman studies under dynamic and static polarization conditions corroborate the existence of a solvent blocking interface (SBI), which inhibits the occurrence of water-splitting. Also, the reversible nature of the charge-storage process is assessed as a function of the applied voltage. At extreme polarization, the SBI structure is disrupted, thus allowing the occurrence of water-splitting and anionic (ClO4-) intercalation between the graphene sheets.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Assunto da revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos
Texto completo
Adicionar na Minha BVS
Imprimir
XML
PubMed Links
Buscar no Google

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Idioma: En Revista: ACS Appl Mater Interfaces Assunto da revista: BIOTECNOLOGIA / ENGENHARIA BIOMEDICA Ano de publicação: 2021 Tipo de documento: Article País de afiliação: Brasil País de publicação: Estados Unidos