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Self-Discharge Related to Iron Ions and its Effect on the Parameters of HES PbO2 ∣ H2SO4 ∣ C Systems

Self-Discharge Related to Iron Ions and its Effect on the Parameters of HES PbO2 ∣ H2SO4 ∣ C... This work contains the results of research on the mechanism of the shuttle self-discharge determined by and ions in the electrolyte of a heterogeneous electrochemical supercapacitor (HES) of a system, as well as the results of the measurements of the effect of the shuttle self-discharge current on the energy, capacity, and operation parameters of HES capacitors. It is shown that the presence of the iron ions in the electrolyte of a HES capacitor brings about shuttle self-discharge, which continues until the voltage decreases to the value of . The shuttle mechanism is related to oxidation and reduction of and ions in the positive and negative electrodes, respectively. An analytical expression is obtained for the calculations of the shuttle self-discharge current determined by different types of impurity ions in the electrolyte of HES capacitors. Analysis is made with respect to the obtained experimental and theoretical data of the self-discharge current, energy, and capacity parameters, as well as their dependence on the concentration of iron ions in the electrolyte, the separator’s thickness, and modes of the capacitors’ charge. It is established that the processes of oxidation and reduction of iron ions take place in the near-surface layers of the capacitor electrodes. It is shown that the linear increase of the separator thickness does not bring about any linear decrease of the shuttle self-discharge current determined by and ions. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Journal of the Electrochemical Society IOP Publishing

Self-Discharge Related to Iron Ions and its Effect on the Parameters of HES PbO2 ∣ H2SO4 ∣ C Systems

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References (5)

Copyright
Copyright © 2007 ECS - The Electrochemical Society
ISSN
0013-4651
eISSN
1945-7111
DOI
10.1149/1.2742335
Publisher site
See Article on Publisher Site

Abstract

This work contains the results of research on the mechanism of the shuttle self-discharge determined by and ions in the electrolyte of a heterogeneous electrochemical supercapacitor (HES) of a system, as well as the results of the measurements of the effect of the shuttle self-discharge current on the energy, capacity, and operation parameters of HES capacitors. It is shown that the presence of the iron ions in the electrolyte of a HES capacitor brings about shuttle self-discharge, which continues until the voltage decreases to the value of . The shuttle mechanism is related to oxidation and reduction of and ions in the positive and negative electrodes, respectively. An analytical expression is obtained for the calculations of the shuttle self-discharge current determined by different types of impurity ions in the electrolyte of HES capacitors. Analysis is made with respect to the obtained experimental and theoretical data of the self-discharge current, energy, and capacity parameters, as well as their dependence on the concentration of iron ions in the electrolyte, the separator’s thickness, and modes of the capacitors’ charge. It is established that the processes of oxidation and reduction of iron ions take place in the near-surface layers of the capacitor electrodes. It is shown that the linear increase of the separator thickness does not bring about any linear decrease of the shuttle self-discharge current determined by and ions.

Journal

Journal of the Electrochemical Society – IOP Publishing

Published: May 31, 2007

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