Effect of the nature of conductive supported nickel electrocatalyst for salicylic acid oxidation in alkaline medium

The electrocatalytic activity of Ni films electrodeposited on glassy carbon (Ni/GC), titanium (Ni/Ti), and gold (Ni/Au) electrodes toward salicylic acid (SA) oxidation are investigated. The cyclic voltammetry studies show that the nature of substrate strongly influences the apparent electrocatalytic activities of the nickel over layer in basic medium. It is observed that the Ni/GC electrode has higher activity for SA oxidation compared to other electrodes. Effects of various parameters such as concentration of Ni²⁺, deposition time for Ni film growth, and deposition potential on the electrooxidation of SA are investigated. It is demonstrated that the Ni(OH)₂/NiOOH plays the key role in the electrooxidation of SA. The response to SA on the Ni/GC electrode is examined using chronoamperometry.