Binary cobalt and manganese oxides: Amperometric sensing of hydrogen peroxide

In the present work, novel binary metal oxides - cobalt-manganese mixed oxide (Mn3O4-MnCo3O4) nanoparticles were synthesized with a facile solvothermal precipitation method by using carbon nanotubes as the sacrificial template for the first time. The structural and morphological features of the as-prepared materials were characterized by X-ray diffraction (XRD) spectroscopy, scanning electron microscopy (SEM), transmission electron microscopy (TEM), and Fourier transform infrared (FT-IR) spectrum. A novel nonenzymatic electrochemical sensor based on Mn3O4-MnCo2O4 was fabricated and applied in the determination of H2O2. A wide linear range of 0.1-1274.3 mu M and a low detection limit of 0.020 mu M (S/N = 3) were obtained. The proposed sensor was employed in the determination of H2O2 in milk and fetal bovine serum samples, which exhibited high sensitivity, high selectivity, good stability, and satisfactory feasibility. (C) 2017 Elsevier B.V. All rights reserved.