Effects of electrolyte substitution on the specific capacitance and equivalent series resistance of energy storage electrochemical supercapacitors
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2018
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23.
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The microstructure, chemical composition, equivalent series resistance (ESR) and
specific capacitance (Cs) of supercapacitors electrodes have been investigated.
Commercial activated carbon electrodes employing organic electrolyte have been
tested at a potential window of 1.1 and 2.7 V. Specific capacitances were calculated
from cyclic voltammetry curves at room temperature employing various scan rates (2-
70 mV/s). Internal resistances of the supercapacitors were calculated using the
galvanostatic cycling curves at several current densities (10-175 mA/g). A maximum
specific capacity of 58 Fg-1 has been achieved with the organic electrolyte at a current
density of 30 mA/g and a potential window of 2.7V. After this initial study, the organic
electrolyte was removed from the electrodes by back pumping vacuum. Two new
aqueous electrolytes have been substituted in the commercial electrodes for a
comparison: Na2SO4 and KOH (1.0 mol/L). At a discharge density of 75 mA/g, the
electrodes with KOH showed a maximum specific capacitance of 53 F/g whereas the
Na2SO4 showed only 6 F/g. ESR of the electrodes with organic electrolyte and KOH
were in the range of 20 ohms.cm^2 whereas with Na2SO4 of 14 ohms.cm^2. The
microstructures of the electrode material have been investigated using scanning
electron microscopy (SEM) and chemical microanalyses employing energy dispersive
X-ray analysis (EDX). A compositional and morphological evaluation of these
electrodes showed a very homogeneous structure.
Como referenciar
FANTIN, L.; YOSHIKAWA, D.; GALEGO, E.; FARIA, R.N. Effects of electrolyte substitution on the specific capacitance and equivalent series resistance of energy storage electrochemical supercapacitors. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... p. 657-657. Disponível em: http://repositorio.ipen.br/handle/123456789/29647. Acesso em: 27 Mar 2026.
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.