Electrochemical Determination of Ethanol, 2- Propanol and 1-Butanol on Glassy Carbon Electrode Modified With Nickel Oxide Film

Abstract

In this work, we present the modification of a glassy carbon electrode with nickel oxide film which is  performed in two successive steps. In the first one, the electrochemical deposition of metallic nickel on the glassy carbon electrode (GCE) is achieved in 0.1M boric acid; in the second step, the metallic deposit is anodically oxidized in 0.1M NaOH. These two operations were carried out in a three electrode cell with a filiform platinum auxiliary electrode, a SCE as potential reference and a working microelectrode of modified glassy carbon with nickel oxides. This electrode is characterized by several electrochemical techniques and is used for the catalytic determination of ethanol, 2-propanol and 1-butanol in 0.1 M NaOH. The proposed chemical mechanism shows that NiO₂ acts as a mediator.

Keywords: Sensor; Electrodeposition; Electrocatalysis; Alcohol; Mediator.