Electrochemical Study of Conducting Polymer/Lignin Composites

Electropolymerization and redox behavior of lignin composites were characterized by cyclic 

voltammetry (CV), electrochemical quartz crystal microbalance (EQCM), and Fourier transform 

infrared spectroscopy (FTIR). Oxidation of lignin (LG) composites mixed with different polymers such 

as; Poly (o-phenylenediamine) (POPDA), Pyrrole (Py), 4-amino-3-hydroxynaphthalene-sulfonic acid 

(AHNSA) on working glassy carbon electrode (GCE) were performed by cyclic voltammetry in a 

three-electrode electrochemical cell. EQCM was used during polymerization technique and detecting 

the continuous mass increase with the number of potential cycles. Transmission FTIR spectra of 

the electropolymerized film of pyrrole and lignin composite polymer after deposition were recorded. 

These results gave evidence of lignin composite formation due to the fact that new and broad bands 

in the region of 3411"–3460 cm-1 were observed.