Cyclic voltammetry electropolymerization of PEDOT:Polydopamine on gold electrodes*

This work presents a facile and rapid fabrication method for high-performance bioelectrode coatings through electropolymerization of poly(3,4-ethylenedioxythiophene) (PEDOT) and polydopamine (PDA). Expanding on previous work, we develop a cyclic voltammetry electropolymerization process to deposit PEDOT:PDA coatings on 2 mm gold electrode substrates. The coatings exhibit a 40-fold increase in cathodic charge storage capacity (∼ 40mC·cm −2 ) and significant impedance modulus reduction compared to uncoated gold electrodes. Morphological characterization revealed a uniformly porous surface that corroborates the enhancement in electrochemical performance. Our scalable approach offers a promising option to fabricate bioelectrodes for application to neural interfaces and implantable and wearable bioelectronics. Clinical Relevance The improved electrochemical performance and scalable fabrication of PEDOT:PDA coatings support their potential to enhance the stability and signal quality of neural and implantable bioelectronic devices.