Influence of the electrolyte window potential on the electrical characteristics of supercapacitors operating elevated temperatures
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2018
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CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23.
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The equivalent series and parallel resistances (EPR and ESR) and specific
capacitance (Cs) of supercapacitors carbon electrodes have been investigated using
cyclic voltammetry and electrochemical impedance spectroscopy. Commercial
activated carbon electrodes employing organic electrolyte have been tested using a
window potential in the range of 2.7–3.8 V. Specific capacitances were calculated from
cyclic voltammetry curves at room temperature employing various scan rates (2-50
mVs-1). Internal series resistances of the supercapacitors were measured using the
galvanostatic curves at room temperature and above (25-100oC). The ESR increase
to 9.75 ? at 25° and 2.7V for 110.5 ? at with operating temperature raise and also with
overpotential. The parallel series resistance (EPR) have also been determined using
self-discharge curves at 3, 24, 48 and 120h in three distinct temperatures (25-100oC).
The EPR modify with increase of temperature and also with overpotential staring 0.623
M? at 25°C and 2.7 V for 0.089 M? at 100°C and 3.8V. 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. It has been shown that the specific capacitance decreased
considerably with scan rate, current density, electrochemical window potential and
working temperature.
Como referenciar
VIEIRA, L.S.; CASINI, J.C.S.; YOSHIKAWA, D.; FARIA, R.N.; MANSANI, G.L. Influence of the electrolyte window potential on the electrical characteristics of supercapacitors operating elevated temperatures. In: CONGRESSO BRASILEIRO DE ENGENHARIA E CIÊNCIA DOS MATERIAIS, 23., 04-08 de novembro, 2018, Foz do Iguaçu, PR. Resumo... p. 2896-2896. Disponível em: http://repositorio.ipen.br/handle/123456789/29626. Acesso em: 30 Dec 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.