We report on the synthesis of ZrO2-rGOnanocomposite and its application for electrochemical sensing and biosensingof important biological compounds. ZrO2-rGO hybrid is synthesized through a simple one-pothydrothermal route. The resultant hybrid material was characterizedusing SEM, TEM, XRD and Raman spectroscopy. Electrochemical studies revealed that the ZrO2-rGO/GC electrode possessed excellent electrocatalytic activities toward the catalytic reduction of O2 and H2O2 at reduced overpotentials.The response to H2O2 and glucose onZrO2-rGO/GC andGOX/ZrO2- rGO/GC electrodewas examined using cyclic voltammetry and amperometry.The detection limits of these proposed sensors were20nM(for H2O2) and 80 μM(for glucose). In addition, using differential pulse voltammetry (DPV), the high electrocatalytic activity of the modified electrode toward simultaneous detection of AA,DA and UA compounds was illustrated. We envisage that the ZrO2-rGO hybrid may hold great promise for the development of electrochemical sensors as well as other applications, such as supercapacitors, fuel cells and batteries.
