Electrochemical study of modified glassy carbon electrode with polyaniline nanoparticles using cyclic voltammetry

• Published in: Bulletin of the Chemical Society of Ethiopia Vol. 36; no. 3; pp. 687 - 696
• Main Authors: Radhi, Muhammed Mizher, Mossa, Ahmed Ali, Al-Mulla, Emad Abbas Jaffar, Lafta, Ali Naeemah
• Format: Journal Article
• Language: English
• Published: Chemical Society of Ethiopia 01-09-2022
• Subjects: Electrolytes; Nanoparticles; Povidone; Sensors; Iraq
• DOI: 10.4314/bcse.v36i3.17
• EISSN: 1726-801X
• ISSN: 1011-3924

The mechanical attachment method was used to modify the glass carbon electrode (GCE) with polyaniline nanoparticles (PANI NPs) to produce a new nanosensor (PAN NPs/GCE). Electrochemical properties was studied by a new nano working electrode using cyclic voltammetric (CV) technique to develop the oxidation – reduction reaction. K4[Fe(CN)6] solution is one of the standard solutions for CV titration by redox peak current of FeII/FeIII in KCl solution as electrolyte, which can be used to study different concentrations, scan rates, pH, diffusion coefficient (Df) and reliability and stability PAN NPs/GCE modified electrode. The CV results of the new PANI NPs/GCE nanosensor have two peaks at 400 and 200 mV for oxidation-reduction FeII/FeIII, respectively. The current ratio value of the new PAN NPs/GCE was found to be Ipa/Ipc ≈ 1 with a separation peak of ∆Epa-pc = 200 mV. From these results, the nanosensor acts as an irreversible and heterogeneous reaction. Other electrochemical properties of the new sensor have a low detection limit of K4[Fe(CN)6]. In addition to the highly enhancement of the redox peak current in acidic pH, it was obtained good stability of nanomaterial on the electrode.

KEY WORDS: Polyaniline nanoparticles, GCE, K4[Fe(CN)6], Redox process, Cyclic voltammetry
Bull. Chem. Soc. Ethiop. 2022, 36(3), 687-696.                                                               
DOI: https://dx.doi.org/10.4314/bcse.v36i3.17