Electrochemical Study of Interfacially Synthesized Polycarbazole with Different Oxidants.

This work focused on the morphology-controlled electrochemical impedance spectroscopic (EIS) studies of polycarbazole (PCz) in two different electrolytes. PCz is synthesized through controlled interfacial polymerization by using two different oxidizing agents, (NH₄)₂S₂O₈ (APS) and KMnO₄. Voltammetric and EIS studies were carried out to explore charge-transfer properties in the vicinity of modified PCz/glassy carbon (GC) and PCz/Pt electrodes with different electrolytes that have different-sized anions. It has been observed that PCz-APS exhibits enhanced electron-transfer kinetics compared to PCz-KMnO₄ at either electrode (GC or Pt) in a supporting electrolyte with a smaller anion size. This is attributed to its favorable diffusion inside the porous polymer film, resulting in easy ion exchange at the electrode surface. The morphology-controlled synthesis approach presented herein is extremely significant for chemical sensors, biosensors, and catalytic applications, owing to its high electroactivity. [ABSTRACT FROM AUTHOR]