Characteristics of electric double layer capacitors produced with electrolytes based on deep eutectic solvents
Carregando...
Data
Data de publicação:
2022
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
É parte de
CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24.
Exportar
Resumo
The storage capacity of electric double layer capacitors or supercapacitors with electrolytes based
on deep eutectic solvents (DES) has been investigated in this study. DES composed of L-lactic acid
with nicotinamide, L-alanine, ammonium acetate, sodium acetate and choline chloride have all
been prepared at a molar ratio of 7:1. Furthermore, urea with choline chloride at a molar ratio of
2:1 has also been used as electrolyte for the electrochemical supercapacitors. The DES
supercapacitors were prepared using commercial activated carbon electrodes after removing the
volatile organic electrolyte with back-pumping vacuum. The electric characteristics of these
supercapacitors with DES electrolytes were determined by cyclic voltammetry at room temperature
and above up to 80°C. The cyclic voltammetry scan rates were varied from 2 to 25 mVs-1. The
lowest scan rate led to a high specific capacitance of 150±8 Fg-1 for urea with choline chloride at a
molar ratio of 2:1 and using a maximum applied potential of 1.7 V. For higher molar ratio (7:1) of Llactic
acid with the others hydrogen bond acceptors (HBA) it was necessary to increase the
temperature above room temperature to improve the specific capacitance. The best results have
been obtained with two solids (urea and choline chloride) as starting compounds for preparing the
DES. Equivalent series resistances (ESR) have also been determined in this work employing
galvanostatic cycling tests with current densities between 2 and 20 mAg-1.
Como referenciar
GALDINO, G.S.; RODRIGUES, W.C.; CRUZ, P.D.; CASINI, J.S.; SAKATA, S.K.; FARIA, R.N. Characteristics of electric double layer capacitors produced with electrolytes based on deep eutectic solvents. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 24., 6-10 de novembro, 2022, Águas de Lindóia, SP. Resumo... Disponível em: http://repositorio.ipen.br/handle/123456789/33742. Acesso em: 15 Mar 2025.
Esta referência é gerada automaticamente de acordo com as normas do estilo IPEN/SP (ABNT NBR 6023) e recomenda-se uma verificação final e ajustes caso necessário.