Jump to main content
Jump to site search
PLANNED MAINTENANCE Close the message box

Scheduled maintenance work on Wednesday 21st October 2020 from 07:00 AM to 07:00 PM (BST).

During this time our website performance may be temporarily affected. We apologise for any inconvenience this might cause and thank you for your patience.


Volume 172, 2014
Previous Article Next Article

Redox-active electrolyte for supercapacitor application

Author affiliations

Abstract

This paper reports the electrochemical behaviour of supercapacitor carbon electrodes operating in different aqueous solutions modified by various redox-active species (hydroxybenzenes, bromine derivatives and iodide). Three dihydroxybenzenes with varying stereochemistry, i.e., –OH substitution, have been considered as electrolyte additives (0.38 mol L−1) in acidic, alkaline and neutral solutions. High capacitance values have been obtained, especially for the acidic and alkaline solutions containing 1,4-dihydroxybenzene (hydroquinone). Bromine derivatives of dihydroxybenzenes were also considered as the additive in alkaline solution for use as a supercapacitor electrolyte, and a significant increase in capacitance value was observed. The redox couple investigated next was an iodide/iodine system, where 2 mol L−1 NaI aqueous electrolyte was utilized. In this case, the most promising faradaic contribution during capacitor operation was achieved. In particular, stable capacitance values from 300–400 F g−1 have been confirmed by long-term galvanostatic cycling (over 100 000 cycles), cycling voltammetry and floating. The mechanism of pseudocapacitance phenomena was discussed and supported by electrochemical and physicochemical measurements, e.g., in situ Raman spectroscopy.

Back to tab navigation

Associated articles

Article information


Submitted
25 Mar 2014
Accepted
06 May 2014
First published
06 May 2014

Faraday Discuss., 2014,172, 179-198
Article type
Paper
Author version available

Redox-active electrolyte for supercapacitor application

E. Frackowiak, M. Meller, J. Menzel, D. Gastol and K. Fic, Faraday Discuss., 2014, 172, 179
DOI: 10.1039/C4FD00052H

Social activity

Search articles by author

Spotlight

Advertisements