Electrochemical performance of electroactive poly(amic acid)-Cu2+ composites

Electroactive poly(amic acid)-Cu2+ (EPAA-Cu) composites on the substrates have been prepared, whose electrochemical properties, including electroactivity, electrochromism and anticorrosion, reveal drastic enhancement after incorporation of Cu2+ ions. [Display omitted] •The electroactive poly(amic acid)-Cu2+ (EPAA-Cu) composites were prepared.•A significant current enhancement phenomenon of EPAA-Cu/ITO electrodes was observed.•EPAA-Cu/ITO electrochromic electrodes reveals a shorter switching times.•Excellent corrosive protection for the CS was achieved by incorporating Cu2+ ions. Electroactive poly(amic acid)-Cu2+ (EPAA-Cu) composites on substrates were successfully prepared via nucleophilic polycondensation followed by the use of an immersing method. Analysis of the structure properties of EPAA-Cu composites was performed using scanning electron microscopy (SEM), X-ray photoelectron spectra (XPS) and Fourier-transform infrared spectra (FTIR). A significant current enhancement phenomenon of EPAA-Cu/ITO electrodes was found as evident from cyclic voltammetry (CV) measurements. In addition, Cu2+ ions were incorporated into the composites and had a positive effect on their electrochromic behaviors decreasing their switching times. The anticorrosive performance of EPAA-Cu composites coatings on the carbon steel in 3.5wt% NaCl solution were also investigated in detail using tafel plots analysis and electrochemical impedance spectroscopy. The anticorrosive ability of these coatings significantly enhanced through the incorporation of Cu2+ ions.