Electrocatalytic and new electrochemical properties of chloropromazine in to silicaNPs/chloropromazine/Nafion nanocomposite: Application to nitrite detection at low potential

In this study, the electrochemical behavior of chloropromazine at glassy carbon (GC) electrode modified with silica nanoparticles/chloropromazine/Nafion (SNPs/CPZ/Nf) nanocomposite was investigated. The apparent electron transfer rate constant (ks), transfer coefficient (α) and surface concentration (Γc) were found to be 0.56 s− 1, 0.49 and 3.49 × 10− 7 mol cm2 −, respectively. Cyclic voltammetry technique has been used for stabilization of nanocomposite on the surface of GC electrode. Electrochemical impedance spectroscopy (EIS) and transmission electron microscopy (TEM) techniques were used to confirm the successful stepwise assembly procedure of the electrode. The modified electrode showed electrocatalytic activity toward nitrite electro-reduction at 0.12 V. The detection limit (signal to noise) and sensitivity are 7 μM and 0.0007 μA/μM, respectively. The advantages of the nitrite amperometric detector based on the SNPs/CPZ/Nf nanocomposite GCE are a low detection limit, reduction in low potential in particular, high sensitivity and inherent stability at pH 2, catalytic activity for nitrite reduction antifouling property toward nitrite and its reduction product. Furthermore, the proposed electrode was used for determination of nitrite in food samples.