Electrodeposition of Cobalt Oxide Nanostructure on the Glassy Carbon Electrode for Electrocatalytic Determination of para-Nitrophenol

Cobalt oxide nanostructure (CoOxNS) deposited on the glassy carbon (GC) electrode surface is proposed as a novel electrocatalytic system for the reduction of para-Nitrophenol. Cyclic voltammetry, electrochemical impedance spectroscopy, atomic force microscopy and scanning electron microscopy were used for characterization of deposited CoOxNS. CoOxNS deposited by cycling at positive potentials (0 to +1.3 V) show less charge-transfer resistance (Rct) and more catalytic activity for the electroreduction of p-nitrophenol compared to those CoOxNS obtained by scanning the applied potential throughout a negative V range. The GC/CoOxNS electrode showed good electrocatalytic activity toward the reduction of p-nitrophenol at different pH values.