Binary cobalt and manganese oxides: Amperometric sensing of hydrogen peroxide

• Published in: Sensors and actuators. B, Chemical Chemical, 2017-12, Vol.253, p.949-957
• Main Authors: Wu, Zhi-Liang, Li, Cheng-Kun, Zhu, Fa-wei, Liao, Sen, Yu, Jin-Gang, Yang, Hua, Chen, Xiao-Qing
• Format: Article
• Language: English
• Subjects: Amperometry; Binary metal oxides; Carbon nanotubes; Chemical sensors; Cobalt; Electrical measurement; Fourier transforms; Hydrogen peroxide; Infrared radiation; Manganese compounds; Manganese oxides; Metal oxides; Nanoparticles; Oxidation; Sacrificial template; Scanning electron microscopy; Solvothermal precipitation; Transmission electron microscopy; X-ray diffraction
• ISSN: 0925-4005; 1873-3077
• DOI: 10.1016/j.snb.2017.07.012

•Mn3O4-MnCo2O4 composite was firstly developed.•Mn3O4-MnCo2O4 was prepared via a solvothermal precipitation method.•Mn3O4-MnCo2O4 displayed high activity for the electrocatalytic oxidation of H2O2.•Mn3O4-MnCo2O4 based amperometric sensor showed good sensitivity and selectivity to H2O2. 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 0.1–1274.3μM and a low detection limit of 0.020μM (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.