Journal
JOURNAL OF POWER SOURCES
Volume 255, Issue -, Pages 230-234Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.12.140
Keywords
Electrochemical capacitor; Pseudocapacitance; Humic acids; Quinone/hydroquinone
Funding
- National Science Centre of Poland [UMO-2011/03/B/ST5/01508]
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Novel electrolyte additive for electrochemical capacitors has been reported. It has been demonstrated for the first time that addition of humic acids (HA) to KOH-based electrolyte significantly increases capacitance of symmetrical capacitors with electrodes made of activated carbon. Specific capacitances determined by means of galvanostatic charge/discharge, cyclic voltammetry and electrochemical impedance spectroscopy consistently showed increases for HA concentrations ranging from 2% w/w up to saturated solution with maximum positive effect observed for 5% w/w of the additive. The capacitance increase has been attributed to complex faradaic processes involving oxygen-containing groups of HA molecules. Due to abundant resources, low cost and easy processability the reported solution can find application in electrochemical capacitor technologies. (C) 2014 Elsevier B.V. All rights reserved.
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