A novel non-enzymatic H2O2 sensor using ZnMn2O4 microspheres modified glassy carbon electrode.

With a facile solvothermal technique, ZnMn2O4 microspheres were synthesized in this work, which were used as enzyme mimics for the electrocatalytic reduction of H2O2. The morphology, crystal phase and structure of the ZnMn2O4 microspheres underwent characterization under X-ray diffraction spectroscopy, Raman spectroscopy, energy-dispersive spectroscopy, and scanning electron microscopy. The synthesized ZnMn2O4 microspheres showed an average diameter of 2 μm with great crystallinity, and exhibited excellent catalytical activity towards H2O2 electroreduction in alkaline media. The glassy carbon electrode modified by ZnMn2O4 microspheres showed a linear amperometric response for H2O2 in a wide concentration range of 0.02 ˜ 15 mM with detection limit of 0.13 μM under the optimized conditions. Besides, the sensor proposed here was successfully used to determine H2O2 in milk, suggesting that ZnMn2O4 microspheres can be used for non-enzymatic electrochemical sensor applications.