On the Causes of non-Linearity of Galvanostatic Charge Curves of Electrical Double Layer Capacitors | Sciact - CRIS-system of Boreskov Institute of Catalysis

On the Causes of non-Linearity of Galvanostatic Charge Curves of Electrical Double Layer Capacitors Full article

Journal

Electrochimica Acta
ISSN: 0013-4686 , E-ISSN: 1873-3859

Output data

Year: 2021, Volume: 390, Article number : 138896, Pages count : 9 DOI: 10.1016/j.electacta.2021.138896

Tags

EDLC, Carbon materials, Micropores, Mesopores, Electrode, Specific capacitance

Authors

Esarev Igor V. ^1,4 , Agafonov Dmitrii V. ¹ , Surovikin Yuri V. ² , Nesov Sergey N. ³ , Lavrenov Alexander V. ²

Affiliations

1	Department of Electrochemistry, St. Petersburg State Institute of Technology (Technical University), Moskovsky prospect 26, St. Petersburg190013, Russian Federation
2	Center of New Chemical Technologies BIC, Boreskov Institute of Catalysis, Neftezavodskaya str.54, Omsk644040, Russian Federation
3	Omsk Scientific Center of SB RAS, 15 Karl Marx Avenue, Omsk 644024, Russian Federation
4	Institute of Medicinal and Pharmaceutical Chemistry, TU Braunschweig, Beethovenstr. 55, Braunschweig 38106, Germany

Funding (1)

Ministry of Science and Higher Education of the Russian Federation

0239-2021-0012

In the analysis of electrochemical behavior of electrical double layer capacitors (EDLC), it is generally accepted that the linear form of chronopotentiograms testifies to the ideal polarization of the electrode and any deviations from the linearity are interpreted most often as the appearance of Faraday processes on the electrode surface. However, studies on electrochemical behavior of supercapacitors based on carbon materials should take into account the surface nonequipotentiality caused by the porosity of electrode materials, which complicates the formation of electrical double layer (EDL). The influence of this factor is clearly demonstrated by the results obtained in this work with the use of micro- and mesoporous carbon materials of different origin. To accurately estimate the dependence of linearity of chronopotentiograms on porosity of the electrode material, low current densities were used (from 0.008 to 0.08 mA/cm2). A comparison of charge curves at different charge currents showed that the time dependence of voltage changes considerably with an increase in the current load. A formal comparison of chronopotentiograms linearity obtained at different current loads was made using dimensionless coordinates on the time axis, which were expressed as a percentage of the overall polarization time. Only the charging branch of chronopotentiogram was analyzed here because the anodic branch had similar formal characteristics.

Esarev I.V. , Agafonov D.V. , Surovikin Y.V. , Nesov S.N. , Lavrenov A.V.
On the Causes of non-Linearity of Galvanostatic Charge Curves of Electrical Double Layer Capacitors
Electrochimica Acta. 2021. V.390. 138896 :1-9. DOI: 10.1016/j.electacta.2021.138896 WOS Scopus РИНЦ ANCAN OpenAlex

Submitted:	Mar 26, 2021
Accepted:	Jul 5, 2021
Published online:	Jul 10, 2021
Published print:	Sep 10, 2021

Web of science:	WOS:000683545900009
Scopus:	2-s2.0-85110384862
Elibrary:	46904468
Chemical Abstracts:	2021:1565168
Chemical Abstracts (print):	179:237684
OpenAlex:	W3182973249

DB	Citing
Web of science	11
Scopus	12
Elibrary	14
OpenAlex	12