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Recycling of typical supercapacitor materials.

Vermisoglou, EC, Giannouri, M, Todorova, N, Giannakopoulou, T, Lekakou, C and Trapalis, C (2016) Recycling of typical supercapacitor materials. Waste management & research : the journal of the International Solid Wastes and Public Cleansing Association, ISWA, 34 (4). pp. 337-344.

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A simple, facile and low-cost method for recycling of supercapacitor materials is proposed. This process aims to recover some fundamental components of a used supercapacitor, namely the electrolyte salt tetraethyl ammonium tetrafluoroborate (TEABF4) dissolved in an aprotic organic solvent such as acetonitrile (ACN), the carbonaceous material (activated charcoal, carbon nanotubes) purified, the current collector (aluminium foil) and the separator (paper) for further utilization. The method includes mechanical shredding of the supercapacitor in order to reduce its size, and separation of aluminium foil and paper from the carbonaceous resources containing TEABF4by sieving. The extraction of TEABF4from the carbonaceous material was based on its solubility in water and subsequent separation through filtering and distillation. A cyclic voltammetry curve of the recycled carbonaceous material revealed supercapacitor behaviour allowing a potential reutilization. Furthermore, as BF4 (-)stemming from TEABF4can be slowly hydrolysed in an aqueous environment, thus releasing F(-)anions, which are hazardous, we went on to their gradual trapping with calcium acetate and conversion to non-hazardous CaF2.

Item Type: Article
Subjects : Mechanical engineering
Divisions : Faculty of Engineering and Physical Sciences > Mechanical Engineering Sciences
Authors :
Vermisoglou, EC
Giannouri, M
Todorova, N
Giannakopoulou, T
Lekakou, C
Trapalis, C
Date : 9 February 2016
DOI : 10.1177/0734242X15625373
Copyright Disclaimer : Published in Waste Management and Research 34 (4) April 2016. Copyright 2016 Sage Publications.
Depositing User : Symplectic Elements
Date Deposited : 28 Jun 2016 11:26
Last Modified : 31 Oct 2017 18:24

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