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

• ZnMn 2 O 4 microspheres/GCE displayed high electrocatalytic activity towards H 2 O 2 reduction. • The non-enzymatic sensor exhibited wide linear range of 0.02 ˜ 15 mM with high sensitivity of 277.1 mA mM−1 cm−2. • The proposed H 2 O 2 sensor showed excellent anti-interference ability and stability. With a facile solvothermal technique, ZnMn 2 O 4 microspheres were synthesized in this work, which were used as enzyme mimics for the electrocatalytic reduction of H 2 O 2. The morphology, crystal phase and structure of the ZnMn 2 O 4 microspheres underwent characterization under X-ray diffraction spectroscopy, Raman spectroscopy, energy-dispersive spectroscopy, and scanning electron microscopy. The synthesized ZnMn 2 O 4 microspheres showed an average diameter of 2 μm with great crystallinity, and exhibited excellent catalytical activity towards H 2 O 2 electroreduction in alkaline media. The glassy carbon electrode modified by ZnMn 2 O 4 microspheres showed a linear amperometric response for H 2 O 2 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 H 2 O 2 in milk, suggesting that ZnMn 2 O 4 microspheres can be used for non-enzymatic electrochemical sensor applications. [ABSTRACT FROM AUTHOR]