Various Modified Electrodes
 A Joint Analysis of Electrochemical Impedance, Cyclic Voltammetry and Pulse Voltammetry Data
Erdoğan, Z.Ö., Altun, A.B., Yazıcıgil, Z., Küçükkolbaşı, S.
Department of Chemistry, Faculty of Science, Selcuk University, Konya/ TURKEY
E-mail: zyazicigil@gmail.com
Cyclic voltammetry (CV) is the most frequently used technique for investigated of modified electrode surfaces. From the properties of the cyclic voltammogram, one can deduce thermodynamic, kinetic and mechanistic characteristics of the electrode reaction. The electrochemical impedance spectroscopy technique (EIS) includes applying a small sinusoidal voltage or current perturbation around a steady-state value and measuring the resulting current or voltage together with phase angle. EIS, which provides information about the electrical resistances, sensitivities and quantities of the systems; It is a very effective and useful method in studying the kinetic and mechanical properties of electrochemical systems for preparation of sensors and quantitative analysis [1, 2].
In this study, it was aimed to prepare modified electrodes based on various nanomaterials and nanocomposites. Nanomaterials are frequently used in electrode modification because of their specific and specific properties only found in nanoscale materials [3]. For this, glassy carbon electrode was modified by various nanomaterials and nanocomposites. The modified electrodes were characterized by scanning electron microscope (SEM), cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS). Electron transference properties of modified and unmodified glassy carbon electrodes was compared. Furthermore the response of electrodes was investigated for various analytes such as ascorbic acid, folic acid by using pulse voltammetry methods.

1.	 Navale, S.T., Khuspe, G.D., Chougule, M.A., Patil, V.B. Polypyrrole, a-Fe2O3  and their hybrid nanocomposite sensor: An impedance spectroscopy study, Organic Electronics, 15 (2014) 2159–2167.
2.	 D Ji, L Liu, S Li, C Chen, Y Lu, J Wu, Q Liu, G. Smartphone-based cyclic voltammetry system with graphene modified screen printed electrodes for glucose detection, Biosensors and Bioelectronics, 15 (2017), 449-456.
3.	Akanda, Md. R., Sohali, M., Aziz, Md. A., Kawde, A.N. Recent Advances in Nanomaterial‐Modified Pencil Graphite Electrodes for Electroanalysis, Electroanalysis, 2016, 28, 408-424.