Comparative Surface Electrochemistry of Co and Co₃O₄ Nanoparticles: Nitrite as an Analytical Probe

摘要

This study described the decoration of edge plane pyrolytic graphite electrode (EPPGE) withsynthesised cobalt and cobalt oxide nanoparticles. The modified electrode was characterised bytechniques such as TEM, FESEM, XRD, EDS, cyclic voltammetry (CV) and electrochemicalimpedance spectroscopy (EIS). The EPPGE-Co demonstrated enhanced electron transport and catalyticefficiency towards nitrite oxidation at pH 7.4 compared with the other electrodes studied. The catalytic6 3 -1 -1rate constant (K) obtained at the EPPGE-Co for nitrite at pH 7.4 is 2.32 x 10 cm mol s while the-7 limits of detection (LoD = 3.3 /m) is 7.3 x 10 M.