Preliminary Study of Electrochemical Behavior of Ketjen Black Modified Glassy Carbon Electrode (GCE) in Dopamine Solution

Authors Firman Ardyansyah, Fredy Kurniawan

Faculty of Science and Data Analytics, Institut Teknologi Sepuluh Nopember (ITS), Kampus ITS Sukolilo, 60111 Surabaya, Indonesia

Issue Volume 13, Year 2021, Number 3
Dates Received 21 March 2021; revised manuscript received 15 June 2021; published online 25 June 2021
Citation Firman Ardyansyah, Fredy Kurniawan, J. Nano- Electron. Phys. 13 No 3, 03027 (2021)
PACS Number(s) 81.05.U, 82.80.Fk
Keywords Modified electrode, Ketjen black (2) , Electroanalysis, Dopamine.

Modification of a glassy carbon electrode (GCE) using Ketjen black has been done. Ketjen black (KB) was attached to the GCE surface employing the drop-casting method with the support of sodium cholate as a surfactant. The measurement was performed using cyclic voltammetry. The preliminary study of the electrochemical behavior of KB-modified GCE was observed using 1 mM dopamine in acetate buffer pH 4 as a supporting electrolyte. The result shows that the anodic peak current of a modified GCE is higher than that of a GCE without modification. It indicates that KB gives a synergy effect for GCE to increase the anodic peak current of dopamine measurement. In selectivity studies, modification of a GCE using KB can improve the selectivity of the sensor. An unmodified GCE is selective for dopamine, uric acid, ascorbic acid, and glucose. After modification of the surface, a GCE is only selective for dopamine. In electrochemical behavior study, five repetitions of measurement resulted in a decrease in the anodic peak current. It indicates that the oxidation product of dopamine molecules is attached strongly to the surface of the KB-modified GCE surface during voltametric measurement causing a decrease in the anodic peak current.

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