Abstract
To prepare an efficient supercapacitor, an activated carbon from agave wastes was prepared and their electrochemical performance was evaluated as a novel electrode for supercapacitor. The carbon was prepared by two thermal pyrolysis processes under nitrogen atmosphere. The first pyrolysis was achieved at 500 °C until the charring of the bagasse; in the second pyrolysis step, the char was impregnated with different mass ratios of KOH (1:2–1:4) and thermally treated at 800 or 900 °C, for 1 h under N2 flow. The textural analysis showed that the activated carbon had a specific surface area of 1462 m2 g−1 and depicted a type I isotherm (IUPAC) characteristic of a microporous carbon. Raman spectroscopy and XRD measurements confirm that the activated carbon contains a small graphitization degree and a disordered structure. The electrochemical study of the symmetric carbon supercapacitor was carried out in 1 M Li2SO4 solution as the electrolyte. The electrochemical performance of the coin cell supercapacitor was evaluated under an accelerated aging floating test consisting of potentiostatic steps at different voltages (1.5, 1.6 and 1.8 V) for 10 h followed by galvanostatic charge/discharge sequences, and the overall procedure summarized a floating time up to 200 h. The highest capacitance was observed at a floating voltage of 1.5 V, with a large initial specific capacitance of 297 F g−1.
Highlights
In the last decade, much attention has been focused on the applications of different novel carbonaceous materials as electrode materials because of their low cost, high conductivity and unusual features
In this article we propose a strategy to improve behavior in symmetric supercapacitors made from activated carbon based on agave wastes, that promises to be an interesting active material for supercapacitors, analyzing via potentiostatic floating test which presents major stability analysis of supercapacitor electrodes than traditional current charge-discharge cycling due to its low degradation in electrodes, respective characterizations of active material are presented
The surface texture of the activated carbon (AC) was investigated by N2 gas adsorption - desorption analysis, specific surface areas were determined via the BET method (SBET)
Summary
Much attention has been focused on the applications of different novel carbonaceous materials (agriculture waste, biomass, etc.) as electrode materials because of their low cost, high conductivity and unusual features These materials are stable in diverse electrolytic solutions and are able to perform stable in a wide temperature range. The most important advantage of these storage devices is the ability of a high dynamic charge propagation, which can be useful for the hybrid power sources, electrical vehicles, digital telecommunication systems, UPS (uninterruptible power supply) for computers, and pulse laser techniques Another benefit of the electrochemical capacitor systems is the possibility of full discharge and that a short-circuit between the two electrodes is not harmful [15]. The textural, structure and electrochemical performance of AC were investigated in detail
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