An Amperometric Hydrogen Peroxide Sensor Based on Hollow Carbon Spheres/Pt NPs Modified Glassy Carbon Electrode

A nanoenzyme hydrogen peroxide (H 2 O 2 ) electrochemical sensor was prepared by fixing a hollow carbon sphere (HCS) and platinum nanoparticles (Pt NPs) nanocomposite onto a glassy carbon electrode (GCE) through physical adsorption and electrodeposition. The morphology and element distribution of HCS-Pt/GCE were characterized by scanning electron microscopy (SEM) and energy-dispersive X-ray spectroscopy (EDS). Cyclic voltammetry (CV) and chronoamperometry (i-t) were used to study the electrocatalytic reduction of H 2 O 2 on HCS-Pt/GCE. The synergistic effect of HCS and Pt NPs enhances the conductivity and catalytic ability of the sensor, which makes HCS-Pt/GCE reach high sensitivity (42.8 μA mM -1 cm -2 ), wide linear range (25 μM~1.7 mM) and low detection limit (6.25 μM). In addition, the sensor has good anti-interference performance. It has been successfully used to evaluate the concentration of H 2 O 2 in seafood soaking solution samples, which provides a new and convenient method for monitoring whether H 2 O 2 in seafood exceeds the standard.