Electrochemical impedance characterization and potential dependence of poly[3,4-(2,2-dibutylpropylenedioxy)thiophene] nanostructures on single carbon fiber microelectrode

The electropolymerization of 3,4-(2,2-dibutylpropylenedioxy)thiophene (ProDOT-Bu2) onto single carbon fiber microelectrode (SCFME) was conducted in acetonitrile (ACN) containing sodium perchlorate (NaClO4) as electrolyte and investigated by cyclic voltammetry (CV). The nanostructured films of poly[3,4-(2,2-dibutyl-propylenedioxy)thiophene] (PProDOT-Bu2) which were depositing showed complete reversible redox behavior in monomer-free electrolyte solution.The capacitive behavior of the films was investigated by electrochemical impedance spectroscopy (EIS) at applied potentials from 0.1 V to 1.3 V. The analysis by equivalent circuit modeling revealed an applied potential around 0.4 V to be most suitable for the system PProDOT-Bu2/SCFME as a double layer supercapacitor component inducing a double layer capacitance Cdl value of 62 mF cm−2.

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► Electropolymerization of 3,4-(2,2-dibutylpropylenedioxy)thiophene (ProDOT-Bu2).
► The equivalent circuit modeling revealed 0.4 V to be most suitable for the system.
► PProDOT-Bu2/SCFME exhibited a double layer capacitance Cdl value of 62 mF cm−2.