A novel perspective for estimating the passivation and energy storage characteristics in micro-mass coatings using CV, EIS, and EQCM techniques: Ultrahigh supercapacitor behaviors of Bismarck Brown R and Bismarck Brown Y polymer films

This study presents a novel approach utilizing cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and electrochemical quartz crystal microbalance (EQCM) techniques to investigate the energy storage properties of polymer film coatings exhibiting passivation effect. According to this approach, the optimal substrate surface platform for energy storage was first selected based on CV and EIS results in a redox-couple (i.e., [Fe (CN)6]3-/[Fe(CN)6]4-) containing medium. Subsequently, a roadmap was developed to explore the energy storage properties of micro-mass coatings by combining CV, EIS, and EQCM techniques. Experimentally, the polymer films of Bismarck Brown R (pBBR) and Y (pBBY) were characterized by CV, EIS, scanning electron microscopy (SEM), energy-dispersive X-ray spectroscopy (EDX), and X-ray photoelectron spectroscopy (XPS). pBBR and pBBY films yielded specific capacitance values of 2289 F/g and 939 F/g, specific energy densities of 258 Wh/kg and 106 Wh/kg, and specific power densities of 35.3 kW/kg and 15.2 kW/kg, respectively.