Electrochemical detection of dissolved oxygen in water using a composite of graphene oxide and platinum nanoparticles

In the present study, we report the electrochemical detection of dissolved oxygen in neutral media using graphene oxide-platinum nanoparticles (GO-PtNPs) composite modified glassy carbon electrode (GCE). The GO-PtNPs composite modified electrode was prepared by immersing the GO modified electrode in deoxygenated 0.5 mM K₂PtCl₆ with 0.5 M KNO₃ solution by cyclic voltammetry. As prepared materials were characterized by scanning electron microscopy and elemental analysis. The GO-PtNPs composite modified electrode showed an excellent electrocatalytic activity towards the reduction of oxygen in pH 7.0 solution than that of PtNPs and GO modified electrodes. The GO-PtNPs composite modified electrode was further used for the detection of dissolved oxygen (DO) in water. The electrochemical results revealed that GO-PtNPs composite modified electrode has high precision and accuracy with the results obtained from the commercial oxygen analyzer for the detection of DO in water.