Electrochemical Detection of Hydrazine Using a Copper oxide Nanoparticle Modified Glassy Carbon Electrode

Metallic copper nanoparticles modified glassy carbon electrode is fabricated by reduction of CuSO4 in the presence of cetyltrimethylammonium bromide (CTAB) through potentiostatic method. As-prepared nanoparticles are characterized by scanning electron microscopy and electrochemical methods. Copper oxide modified glassy carbon electrode (nano-CuO/MGCE) is prepared using consecutive potential scanning in 0.1 M NaOH solution. The electrochemical properties of hydrazine is studied onto either nano-CuO/MGCE or bare GCE by using cyclic voltammetry and chronoamperometry techniques. The results show that the nano-CuO/MGCE can catalyze the hydrazine oxidation in alkaline medium. The electrocatalytic oxidation peak current shows linear dependency on hydrazine concentration. Linear analytical curves are obtained in the ranges of 0.025-1.66 mM and 0.05-2.5 mM by using differential pulse voltammetry (DPV) and amperometry methods, respectively. The detection limits (3s) are determined as 2×10-5 M and 1.2×10-5 M by using amperometry and DPV methods, respectively. The Catalytic rate constant is estimated by using chronoamperometry method. Stability of the modified electrode has also been investigated.