Self-discharge reactions in energy storage devices based on polypyrrole-cellulose composite electrodes

Henrik Olsson, Martin Sjödin, Erik Jämstorp Berg, Maria Strømme, Leif Nyholm

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

The self-discharge behavior of organic electrodes and symmetric devices for sustainable energy storage, composed of electrodes containing a thin layer of polypyrrole coated onto a high surface area cellulose matrix, has been studied for the first time using different electrode sizes and electrolytes. Experimental data from open circuit measurements of the individual electrode potentials of charged symmetrical two-electrode energy storage devices as a function of time were evaluated based on three different self-discharge models. This evaluation clearly showed that the self-discharge process of the positive electrode is governed by a previously undetected activation-controlled faradaic reaction while the self-discharge of the negative electrode is due to diffusion controlled oxidation involving oxygen dissolved in the electrolyte. Potentiostatic three-electrode measurements and spectroelectrochemical experiments also showed that protons as well as maleimide were released from positively polarized polypyrrole electrodes. These new findings clearly show that the self-discharge of the cells originate from two different types of reactions on the positive and negative electrodes and that the main contribution to the self-discharge of the cells comes from an activation controlled reaction involving the positive electrode. These results provide an improved understanding of polypyrrole based devices and also yield new possibilities for the development of stable conducting polymer system for energy storage applications.

Original languageEnglish
Pages (from-to)27-39
Number of pages13
JournalGreen
Volume4
Issue number1-6
DOIs
Publication statusPublished - 2014 Dec 1
Externally publishedYes

Fingerprint

Polypyrroles
Energy storage
Cellulose
Electrodes
Composite materials
Chemical activation
Electrolytes
Conducting polymers
Dissolved oxygen
Protons
Oxidation

Keywords

  • activation-controlled faradaic reaction
  • maleimide
  • Polypyrrole
  • self-discharge
  • stability

ASJC Scopus subject areas

  • Energy(all)

Cite this

Self-discharge reactions in energy storage devices based on polypyrrole-cellulose composite electrodes. / Olsson, Henrik; Sjödin, Martin; Berg, Erik Jämstorp; Strømme, Maria; Nyholm, Leif.

In: Green, Vol. 4, No. 1-6, 01.12.2014, p. 27-39.

Research output: Contribution to journalArticle

Olsson, Henrik ; Sjödin, Martin ; Berg, Erik Jämstorp ; Strømme, Maria ; Nyholm, Leif. / Self-discharge reactions in energy storage devices based on polypyrrole-cellulose composite electrodes. In: Green. 2014 ; Vol. 4, No. 1-6. pp. 27-39.
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