Effects of electrolyte substitution on the specific capacitance and equivalent series resistance of energy storage electrochemical supercapacitors
Carregando...
Data
2020
Data de publicação:
Orientador
Título da Revista
ISSN da Revista
Título do Volume
É parte de
É parte de
É parte de
Materials Science Forum
Exportar
Resumo
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 mVs-1). Internal resistances of the supercapacitors
were calculated using the galvanostatic cycling curves at several current densities (10-175 mAg-1).
A maximum specific capacity of 58 Fg-1 has been achieved with the organic electrolyte at a current
density of 30 mAg-1 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-1). At
a discharge density of 75 mAg-1, the electrodes with KOH showed a maximum specific capacitance
of 53 Fg-1 whereas the Na2SO4 showed only 6 Fg-1. ESR of the electrodes with organic electrolyte
and KOH were in the range of 20 Ωcm2 whereas with Na2SO4 of 14 Ωcm2. 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.B.; YOSHIKAWA, D.S.; GALEGO, E.; FARIA, R.N. Effects of electrolyte substitution on the specific capacitance and equivalent series resistance of energy storage electrochemical supercapacitors. Materials Science Forum, v. 1012, p. 131-135, 2020. DOI: 10.4028/www.scientific.net/MSF.1012.131. Disponível em: http://200.136.52.105/handle/123456789/31633. Acesso em: 20 Apr 2024.
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.