Abstract
This paper is devoted to the investigation of the tolerance of glucose oxidation on NiO (x) /MnO (x) /GC binary catalyst to poisoning by halide ions. NiO (x) /MnO (x) /GC electrode was prepared by the consecutive electrodeposition of MnO (x) followed by the deposition of NiO (x) nanoparticles atop the previously deposited MnO (x) nanoparticles. The electrode was characterized electrochemically and morphologically. Interestingly, experimental results showed that the NiO (x) /MnO (x) /GC electrode shows a superior electrocatalytic activity compared with the NiO (x) /GC electrode and a behavior comparable to the NiO (x) /GC electrode regarding tolerance to poisoning by halides, even in the presence of high concentrations of Cl- and Br- up to 0.3 M. On the other hand, it was found that iodide ions have a significant effect on glucose electrooxidation under the prevailing operating conditions and even at concentrations lower than those of the other two halide ions.