<p>Understanding the influence of electric current on tribochemical reactions and tribofilm formation at electrified interfaces is crucial for advancing lubrication strategies in electric vehicles (EVs) and other electromechanical systems. In this study, we investigated the formation of polymeric tribofilms from a model precursor (α-pinene) under low and high electric current densities and analyzed their electrical properties using an impedance spectroscopy method implemented using a lock-in amplifier. The results revealed that while electric current does not significantly change the tribopolymerization yield or the chemical properties of tribofilm, it has a substantial impact on the electrical properties of the resulting film. Compared to the tribofilm formed without current, the tribofilm formed at a current density of 0.055 A/cm² exhibited a significant decrease in resistivity while the dielectric constant, film thickness, and elastic modulus remained nearly unchanged. However, at a higher current density of 1.1 A/cm², the tribofilm on the sliding contact was much thinner, more compliant, and less polarizable. These findings highlight the impact of electric current during tribochemical reactions on the resistive and dielectric properties of tribofilms, offering insights for optimizing lubricant formulations in electrified friction interfaces. The impedance measurement method developed here will enable electrical characterization of any tribofilm at electrified surfaces in various lubrication conditions.</p> Graphical Abstract <p></p>