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.

Electrocatalytic Oxidation of Paraacetylaminophenol on a Graphite Electrode Modified with Iron Oxides

“…The literature on the manufacture of such electrochemical sensors mentions many electrocatalytic materials, such as conductive polymers [11][12][13], complexes [14] and transition metal oxides; among the latter, there are those based on copper [15][16], cobalt [17][18], nickel [19][20][21][22], zinc [23][24], manganese [25], iron [26][27][28], or alloys of these metals [29][30][31][32]. The presence of the oxidized form of the foregoing inorganic materials in the electrochemical sensor provides an intense electrocatalytic performance [33] capable of oxidizing several organic substances, such as amino acids [34][35][36][37], sugars [38][39] and alcohols [40][41][42]. Several studies have developed coated graphite electrochemical-based sensors from different materials capable to dose paracetamol [43][44].…”