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Issue 16, 2015
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Parallel mechanisms of polypyrrole self-discharge in aqueous media

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In this report we investigate the self-discharge in a positively charged polypyrrole–cellulose composite material in water solution. Rate constants for the self-discharge reaction are determined by potential step methods and their dependence on pH, temperature and applied potential are reported. Based on the results, we propose that two fundamentally different self-discharge mechanisms operate in parallel; one of faradaic origin with a rate constant increasing exponentially with applied potential and one mechanism comprising an initial reaction of the charged polymer with hydroxide ions. The second mechanism dominates at high pH as the rate constant for this reaction increases exponentially with pH whilst the faradaic reaction dominates at low pH. With this report we hope to shed light on the complex and elusive nature of self-discharge in conducting polymers to serve as guidance for the construction of electrical energy storage devices with conducting polymer components.

Graphical abstract: Parallel mechanisms of polypyrrole self-discharge in aqueous media

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The article was received on 18 Nov 2014, accepted on 20 Mar 2015 and first published on 25 Mar 2015

Article type: Paper
DOI: 10.1039/C4CP05355A
Author version available: Download Author version (PDF)
Citation: Phys. Chem. Chem. Phys., 2015,17, 11014-11019
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    Parallel mechanisms of polypyrrole self-discharge in aqueous media

    H. Olsson, Z. Qiu, M. Strømme and M. Sjödin, Phys. Chem. Chem. Phys., 2015, 17, 11014
    DOI: 10.1039/C4CP05355A

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