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Metrology and Measurement Systems

The Journal of Committee on Metrology and Scientific Instrumentation of Polish Academy of Sciences

4 Issues per year


IMPACT FACTOR 2016: 1.598

CiteScore 2016: 1.58

SCImago Journal Rank (SJR) 2016: 0.460
Source Normalized Impact per Paper (SNIP) 2016: 1.228

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Online
ISSN
2300-1941
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Volume 23, Issue 3 (Sep 2016)

Issues

Voltage Dependence of Supercapacitor Capacitance

Arkadiusz Szewczyk
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  • Gdańsk University of Technology, Faculty of Electronics, Telecommunications and Informatics, Narutowicza 11/12, 80-233 Gdańsk, Poland
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/ Josef Sikula
  • Brno University of Technology, Central European Institute of Technology, Technicka 10, Brno 616 00, Czech Republic
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/ Vlasta Sedlakova
  • Brno University of Technology, Central European Institute of Technology, Technicka 10, Brno 616 00, Czech Republic
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/ Jiri Majzner
  • Brno University of Technology, Central European Institute of Technology, Technicka 10, Brno 616 00, Czech Republic
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/ Petr Sedlak
  • Brno University of Technology, Central European Institute of Technology, Technicka 10, Brno 616 00, Czech Republic
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/ Tomas Kuparowitz
  • Brno University of Technology, Central European Institute of Technology, Technicka 10, Brno 616 00, Czech Republic
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Published Online: 2016-07-14 | DOI: https://doi.org/10.1515/mms-2016-0031

Abstract

Electronic Double-Layer Capacitors (EDLC), called Supercapacitors (SC), are electronic devices that are capable to store a relatively high amount of energy in a small volume comparing to other types of capacitors. They are composed of an activated carbon layer and electrolyte solution. The charge is stored on electrodes, forming the Helmholtz layer, and in electrolyte. The capacitance of supercapacitor is voltage- dependent. We propose an experimental method, based on monitoring of charging and discharging a supercapacitor, which enables to evaluate the charge in an SC structure as well as the Capacitance-Voltage (C-V) dependence. The measurement setup, method and experimental results of charging/discharging commercially available supercapacitors in various voltage and current conditions are presented. The total charge stored in an SC structure is proportional to the square of voltage at SC electrodes while the charge on electrodes increases linearly with the voltage on SC electrodes. The Helmholtz capacitance increases linearly with the voltage bias while a sublinear increase of total capacitance was found. The voltage on SC increases after the discharge of electrodes due to diffusion of charges from the electrolyte to the electrodes. We have found that the recovery voltage value is linearly proportional to the initial bias voltage value.

Keywords: Electronic Double-Layer Capacitor (EDLC); charge diffusion; recovery voltage

References

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About the article

Received: 2016-01-07

Accepted: 2016-04-10

Published Online: 2016-07-14

Published in Print: 2016-09-01


Citation Information: Metrology and Measurement Systems, ISSN (Online) 2300-1941, DOI: https://doi.org/10.1515/mms-2016-0031.

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© Polish Academy of Sciences. This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 License. BY-NC-ND 4.0

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