Structure and I2/I− redox catalytic behaviour of PEDOT–PSS films electropolymerized in aqueous medium: Implications for convenient counter electrodes in DSSC

The present paper focuses on the impact of different electro-synthesis processes, used to produce poly(3,4-ethylenedioxythiophene)–poly(styrenesulfonate) (PEDOT–PSS) systems in aqueous medium, on the polymer backbone and its electro-catalytic activity.FE-SEM and micro-Raman spectroscopy were used to analyze the samples obtained by varying the conditions of the electro-polymerization processes. The I2/I− redox behaviour of various PEDOT–PSS layers has been comparatively examined in relation to the surface morphology and structural characteristics of the polymer. A response similar to that of a conventional Pt electrode has been revealed for the films produced by chronoamperometric technique.The study has demonstrated that the polymer structure plays an important role in the electro-activity, providing a possibility to improve the redox performance of PEDOT–PSS films by a proper choice of the synthesis methods. Moreover, the use of aqueous solution as a reaction medium can be welcomed as a sustainable chemistry way involving the use of environmentally friendly chemicals.

Electrochemical polymerization has been used to produce PEDOT–PSS layers in aqueous medium. The influence of the electro-synthesis processes on the polymer backbone and its electro-catalytic activity has been investigated by Raman spectroscopy and the I2/I− redox response, respectively. The study demonstrates how the polymer structure plays an important role in its electro-activity, providing a possibility to improve the redox performance of PEDOT–PSS films by a proper choice of the synthesis methods.Figure optionsDownload as PowerPoint slideHighlights
► PEDOT–PSS films electropolymerized in aqueous medium as counter electrode in DSSC.
► I2/I− redox behaviour related to the morphology and structure of PEDOT–PSS films.
► PEDOT–PSS catalytic response similar to that of a conventional Pt electrode.