Banca de QUALIFICAÇÃO: KELRIE HESSEM DE ARAUJO MENDES

Uma banca de QUALIFICAÇÃO de MESTRADO foi cadastrada pelo programa.
STUDENT : KELRIE HESSEM DE ARAUJO MENDES
DATE: 30/07/2021
TIME: 14:00
LOCAL: Plataforma RNP
TITLE:

DEVELOPMENT OF SUPERCAPACITORS USING COMPOSITE ELECTRODES OF CARBON NANOTUBE/CELLULOSE NANOFIBRILS AND REDOX GEL POLYMER ELECTROLYTES

KEY WORDS:

supercapacitor; carbon nanotubes; cellulose nanofibrils; poly(vinyl alcohol); redox electrolyte

PAGES: 87
BIG AREA: Ciências Exatas e da Terra
AREA: Química
SUBÁREA: Físico-Química
SPECIALTY: Eletroquímica
SUMMARY:

Supercapacitors (SCs) are electrochemical energy storage devices that have a high specific power but retain a low energy density. Strategies to overcome this limitation have been developed in recent years, such as the addition of redox compounds to the electrolyte. Furthermore, in order to expand the number of practical applications of SCs, the construction of solid polymeric electrolytes is of interest, as it allows the assembly of flexible cells and the construction of miniaturized devices in various geometric formats. In this sense, the present work aimed to develop hybrid SCs built with composite electrodes of carbon nanotubes/cellulose nanofibrils and redox gel polymeric electrolytes based on poly(vinyl alcohol). Polymeric electrolytes were added with different redox compounds: methylene blue, hydroquinone and indigo carmine. Polymeric electrodes and electrolytes were characterized, solid cells employing two redox additives (biredox) were constructed and their electrochemical performance evaluated. Finally, the biredox SC achieved specific capacitance, energy density and power density of 7.46 F g-1, 0.55 Wh kg-1 and 360.17 W kg-1, respectively, being able to retain 81.0% of its initial capacitance at the end of 2000 evaluated cycles.

BANKING MEMBERS:
Presidente - EMERSON FERNANDES PEDROSO
Externo ao Programa - SIDNEY NICODEMOS DA SILVA