The effect of vacuum annealing and HDDR processing on the electrochemical characteristics of activated carbon and graphene oxide for the production of supercapacitors electrodes
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2020
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Materials Science Forum
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Electric double-layer capacitors prepared using activated carbons have been subjected to
vacuum heat treatments at low and high temperatures (200, 400, 600, 800 and 1000oC).
The electrodes have been tested at a potential of 1.1 V employing a KOH electrolyte (1.0 and
6.0 mol.L-1). The effect of or HDDR upon the electrical properties has been investigated by cyclic
voltammetry. It has been shown that the specific capacitance at 5 msV-1 increases from 50 Fg-1 to
130 Fg-1 after a heat treatment at 400oC for 1 hour under back pump vacuum. At 400°C the
diminution in the specific capacitance with higher scanning rate (10 msV-1) was much less
pronounced (from 130 Fg-1 to 100 Fg-1). Equivalent series resistance (ESR) and equivalent parallel
resistance of supercapacitors electrodes have also been investigated. Internal resistances of the
supercapacitors were calculated using the galvanostatic curves at current densities (100 mAg-1). A
compositional and morphological evaluation of these electrodes showed no significant change on
the activated carbon structure.
Como referenciar
CRUZ, P.V.D.; COSENTINO, I.C.; GALEGO, E.; YOSHIKAWA, D.S.; FARIA, R.N. The effect of vacuum annealing and HDDR processing on the electrochemical characteristics of activated carbon and graphene oxide for the production of supercapacitors electrodes. Materials Science Forum, v. 1012, p. 125-130, 2020. DOI: 10.4028/www.scientific.net/MSF.1012.125. Disponível em: http://200.136.52.105/handle/123456789/31643. Acesso em: 09 May 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.