| Texto completo | |
| Autor(es): |
Vicentini, Rafael
[1]
;
Venancio, Raissa
[1]
;
Nunes, Willian
[1]
;
Da Silva, Leonardo Morais
[2]
;
Zanin, Hudson
[1]
Número total de Autores: 5
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas, Sch Elect & Comp Engn, Carbon Sci Tech Labs & Mfg Grp, Ctr Innovat New Energies, Adv Energy Storage Div, BR-13083852 Campinas, SP - Brazil
[2] Fed Univ Jequitinhonha & Mucuris Valley, Dept Chem, Lab Fundamental & Appl Electrochem, BR-39100000 Diamantina, MG - Brazil
Número total de Afiliações: 2
|
| Tipo de documento: | Artigo Científico |
| Fonte: | ACS APPLIED MATERIALS & INTERFACES; v. 13, n. 51 DEC 2021. |
| Citações Web of Science: | 0 |
| Resumo | |
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 degrees 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 watersplitting. 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. (AU) | |
| Processo FAPESP: | 14/02163-7 - Desenvolvimento de dispositivos supercapacitores a partir de grafenos, nanotubos de carbono e diamantes |
| Beneficiário: | Hudson Giovani Zanin |
| Modalidade de apoio: | Auxílio à Pesquisa - Jovens Pesquisadores |
| Processo FAPESP: | 17/11958-1 - CINE - Divisão para Armazenamento de Energia Avançado |
| Beneficiário: | Rubens Maciel Filho |
| Modalidade de apoio: | Auxílio à Pesquisa - Programa Centros de Pesquisa em Engenharia |
| Processo FAPESP: | 18/20756-6 - Desenvolvimento de pseudocapacitores a partir de compósitos de óxidos metálicos e carvão ativado |
| Beneficiário: | Willian Gonçalves Nunes |
| Modalidade de apoio: | Bolsas no Brasil - Doutorado |