Investigation of Electrochemical Coating of Polypyrrole in The Presence of Sodium Molybdate and Sodium Tungstate

Polymer composites are considered alternative material because they combine the advantages of all their components. Furthermore, polymer composites can exhibit unique electrochemical and physical properties, enabling their use in applications where metals may not be suitable. Polypyrrole, as a conductive polymer, is a promising candidate for synthesizing new composite materials due to its high electroactivity and ease of processing. Incorporating certain organic and inorganic species into polypyrrole matrices can enhance its electrochemical and physical properties. In the study, polypyrrole films were electrochemically coated in the presence of varying concentrations of sodium molybdate and sodium tungstate. The effects of these metal oxides on the growth of polypyrrole were analyzed, and the electrochemical properties of the resulting composite films were examined in monomer-free solutions. The findings indicate that molybdate and tungstate reduce film’s electroactivity, alter redox peaks, and lead to the formation of a new electrochemical film. The maximum anodic peak charge density for polypyrrole, polypyrrole/WO3 and polypyrrole/MoO4 films was 12.4 mC cm-2, 3.57 mC cm-2 and 3.14 mC cm-2, respectively. Additionally, the results demonstrated that an optimal amount of sodium tungstate enhances charge transfer while maintaining reversibility in redox reactions