Fig. 2: Doped PEDOT Films as BPE.
a Optical microscope images of pristine PEDOT:SDS films followed by BE activation implemented by applying ±0.3 C via the driving electrodes. Any color non-uniformity in the pristine film is quickly overwritten by BE activation. b Cyclic voltammetries (CV) of reduced and oxidized BPE halves. Comparative 10th cycle of CV for PEDOT doped with either SDS or tripolyphosphate (TPP), recorded in phosphate-buffered saline (PBS) at 50 mV s−1. c Electrochemical impedance spectroscopy (EIS) of reduced and oxidized BPE halves. Nyquist plot of EIS for PEDOT doped with either SDS or TPP, recorded in PBS solution. Inset: Higher magnification of the Nyquist plot. d Modified Randles equivalent circuit used to model the electrical properties of the interface. RS indicates solution resistance, RPEDOT is the electronic resistance of PEDOT, and CPE represents the constant phase element containing Y₀ as the CPE parameter (Y·ωⁿ), where Y is admittance, ω is frequency, and n is the deviation from ideal capacitive behavior; and double-layer capacitance46. e Table showing values of putative electronic components in the proposed equivalent circuit. These values were obtained by fitting the circuit to EIS spectra.
