Influence of the electrolyte potential window on the electrical characteristics of supercapacitors operating elevated temperatures
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2020
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Materials Science Forum
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The equivalent series resistances (ESR) and specific capacitances (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 potential window in the range of 2.7–3.8 V. Specific capacitances were calculated
from cyclic voltammetry curves at room temperature employing various scan rates (30 and
100mVs-1). Internal series resistances of the supercapacitors were measured using the galvanostatic
curves at room temperature and above (25 and 50°C). The ESR increase to 9.8 Ω at 25° and 2.7V to
78.8 Ω at with operating temperature raise and also with overpotential. 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 potential window and working temperature.
Como referenciar
SILVA, L.S.V.; MANSANI, G.L.; YOSHIKAWA, D.S.; CASINI, J.C.S.; FARIA, R.N. Influence of the electrolyte potential window on the electrical characteristics of supercapacitors operating elevated temperatures. Materials Science Forum, v. 1012, p. 147-152, 2020. DOI: 10.4028/www.scientific.net/MSF.1012.147. Disponível em: http://200.136.52.105/handle/123456789/31636. Acesso em: 19 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.