The Effect of Vacuum Annealing and HDDR Processing on the Electrochemical Characteristics of Activated Carbon and Graphene Oxide for the Production of Supercapacitors Electrodes

P.V.D. Cruz; Ivana Conte Cosentino; E. Galego; D.S. Yoshikawa; R.N. Faria

doi:10.4028/www.scientific.net/MSF.1012.125

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Influence of Separator Thickness on the Performance of Electric Double Layer Supercapacitors in Aqueous Electrolyte
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Study of Supercapacitors for Use in Dye Sensitized Solar Cells
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Effect of the Heat Treatment on the Microstructure and Morphology of Cigs Thin Films Prepared by RF Magnetron Sputtering at Room Temperature
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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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Effects of Electrolyte Substitution on the Specific Capacitance and Equivalent Series Resistance of Energy Storage Electrochemical Supercapacitors
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Study of CaF₂- Doped PbTe Thin Films Grown by Molecular Beam Epitaxy
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Low-Temperature Reduction of Graphene Oxide Using the HDDR Process for Electrochemical Supercapacitor Applications
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Influence of the Electrolyte Potential Window on the Electrical Characteristics of Supercapacitors Operating Elevated Temperatures
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HomeMaterials Science ForumMaterials Science Forum Vol. 1012The Effect of Vacuum Annealing and HDDR Processing...

The Effect of Vacuum Annealing and HDDR Processing on the Electrochemical Characteristics of Activated Carbon and Graphene Oxide for the Production of Supercapacitors Electrodes

Abstract:

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 1000°C). The electrodes have been tested at a potential of 1.1 V employing a KOH electrolyte (1.0and 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 400°C 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.