Abstract
The effect of halide ion concentration on the capacitor performance was considered during this study. Iodide anion has been selected as the most profitable halide taking into account its electrochemical properties and environmental impact. Several concentrations of NaI were tested (from 0.25 to 5 mol L−1 aqueous solutions) using as electrodes two commercial activated carbons and one KOH-activated carbon. Detailed electrochemical investigation by galvanostatic charging/discharging, cyclic voltammetry, and impedance spectroscopy confirmed the significant impact of iodide concentration on the supercapacitor behavior. The higher concentration of iodide affected especially the performance of positive electrode; increase of iodide concentration changed the potential range of positive electrode and its capacitance increased from 119 F g−1 for 0.25 mol L−1 NaI to 475 F g−1 for 2 mol L−1 NaI solution. The electrode capacitance measured in two-electrode system at current density of 2 A g−1 ranged from 198 F g−1 for 0.25 mol L−1 NaI to 272 F g−1 for 2 mol L−1 NaI solution (capacitance expressed as average of the positive and negative electrode capacitances). It has been proved that 2 mol L−1 alkali metal iodide solution is an optimal electrolyte for the capacitor based on KOH-activated carbon. High capacitance values and perfect stability (100 % retention) of such systems have been observed during long-term galvanostatic charging/discharging (15,000 cycles). In addition, satisfactory floating tests at extended voltage range (1.2 V) were performed.
Similar content being viewed by others
References
Conway BE (1999) Electrochemical supercapacitors scientific fundamentals and technological applications. Kluwer Academic/Plenum Publishers, New York
Pell WG, Conway BE (2004) Peculiarities and requirements of asymmetric capacitor device based on combination of capacitor and battery-type electrodes. J Power Sour 136:334–345
Linden D (2002) Reddy TB handbook of batteries, 3rd edn. The McGraw-Hill Companies, Inc., New York
Weber AZ, Mench MM, Meuers JP, Ross PN, Gostock JT, Liu Q (2011) Redox flow batteries: a review. J Appl Electrochem 41:1137–1164
Simon P, Gogotsi Y (2008) Materials for electrochemical capacitors. Nat Mater 7:845–854
Wander MCF, Shuford KL (2011) Electrolyte effects in a model system for mesoporous carbon electrodes. J Phys Chem 115:4905–4908
Lokhande CD, Dubal DP, Joo O (2011) Metal oxide thin film based supercapacitor. Curr Appl Physics 11:255–270
Gupta V, Miura N (2006) High performance electrochemical supercapacitor from electrochemically synthesized nanostructured polyaniline. Mater Lett 60:1466–1469
Jurewicz K, Delpeux S, Bertagna V, Béguin F, Frackowiak E (2001) Supercapacitors from nanotubes/polypyrrole composites. Chem Phys Lett 347:36–40
Lewandowski A, Olejniczak A, Galinski M, Stepniak I (2010) Performance of carbon–carbon supercapacitors based on organic, aqueous and ionic liquid electrolytes. J Power Sour 195:5814–5819
Yamagata M, Soeda K, Ikebe S, Yamazaki S, Ishikawa M (2013) Chitosan-based gel electrolyte containing an ionic liquid for high-performance nonaqueous supercapacitors. Electrochim Acta 100:275–280
Lota G, Frackowiak E (2009) Striking capacitance of carbon/iodide interface. Electrochem Commun 11:87–90
Lee HY, Goodenough JB (1999) Supercapacitor behavior with KCl electrolyte. J Solid State Chem 144:220–223
Yamazaki S, Ito T, Yamagata M, Ishikawa M (2012) Non-aqueous electrochemical capacitor utilizing electrolytic redox of bromide species in ionic liquid. Electrochim Acta 86:294–297
Lota G, Fic K, Frackowiak E (2011) Alkali metal iodide/carbon interface as a source of pseudocapacitance. Electrochem Commun 12:38–41
Yu H, Wu J, Fan L, Xu K, Zhong X, Lin U, Lin J (2011) Improvement of the performance for quasi-state supercapacitor by using PVA–KOH–KI polymer gel electrolyte. Electrochim Acta 56:6881–6886
Weingarth D, Foelske-Schitz A, Kötz R (2013) Cycle versus voltage hold: which is the better stability test for electrochemical double layer capacitors? J Power Sour 225:84–88
Acknowledgments
The authors gratefully acknowledge the Polish-Swiss Research Programme, Project No. PSPB 107/2010 (INGEC).
Author information
Authors and Affiliations
Corresponding author
Rights and permissions
About this article
Cite this article
Menzel, J., Fic, K., Meller, M. et al. The effect of halide ion concentration on capacitor performance. J Appl Electrochem 44, 439–445 (2014). https://doi.org/10.1007/s10800-013-0657-8
Received:
Accepted:
Published:
Issue Date:
DOI: https://doi.org/10.1007/s10800-013-0657-8