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Synergistic interplay of ionic liquid and dodecyl sulphate driving the oxidation state of Polypyrrole based electrodes


Herein, polypyrrole (PPy) films are prepared via electrochemical deposition in a mixture of 1-n-butyl-3-methylimidazolium methanesulfonate (BMI.CH3SO3) ionic liquid (IL) and dodecyl sulfate (DS). The physico-chemical properties of the films have been investigated by a wide range of characterization techniques. PPY films synthesized in DS or IL have shown larger and irregular granules as compared to PPY films prepared in the mixture of DS and IL. This result is related to the preferential dissolution of pyrrole monomers in micelle templates formed by the IL and a co-assembly of IL and dodecyl-sulfate (DS); thereby, decreasing granule size and affecting the structural arrangement of the polymer chain. The template behavior of IL in combination with DS promotes the selective formation of polaron and bipolaron states in the PPy films. This effect has been investigated by UV-Vis spectrophotometry, Raman spectroscopy, electrochemical impedance spectroscopy (EIS), cyclic voltammetry, scanning electron microscopy, transmission electron microscopy, and electrical conductivity measurements. The synergy of IL-DS has helped to decrease the resistivity of PPy film from 2.17×102 Ω cm for PPy-IL to 2.44 Ω for PPy-IL-DS. EIS has also shown, a decreased interfacial charge transfer resistance for PPy-IL-DS, when compared to PPy-IL. The cyclic voltammetry curves have shown that PPy films are electroctalytically active for I−/I3- redox reaction and therefore, applied as a counter electrode (CE) in dye sensitised solar cells. The PPy based CEs resulted in nearly the same photocurrent and energy conversion efficiencies as that obtained from conventional Pt CE.

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Publication details

The article was received on 16 May 2018, accepted on 05 Jul 2018 and first published on 05 Jul 2018

Article type: Paper
DOI: 10.1039/C8NJ02431F
Citation: New J. Chem., 2018, Accepted Manuscript
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    Synergistic interplay of ionic liquid and dodecyl sulphate driving the oxidation state of Polypyrrole based electrodes

    L. F. Loguercio, C. F. de Matos, M. C. de Oliveira, G. Marin, S. Khan, N. M. Balzaretti, J. Dupont, M. J. L. José Leite Santos and J. Ferreira, New J. Chem., 2018, Accepted Manuscript , DOI: 10.1039/C8NJ02431F

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