A Non-Enzymatic Electrochemical Sensor Based on Cerium Oxide Nanocubes for the Rapid Detection of Hydrogen Peroxide Residues in Food Samples

The rapid and simple detection methods of hydrogen peroxide (H
2
O
2
) residues is highly required for food safety. Herein, an electrochemical H
2
O
2
sensor is developed with cerium oxide nanocubes as highly active non-enzymatic catalyst. Combined with carbon black to improve conductivity, the disposable sensor can determine H
2
O
2
in the range from 100 nM to 100 μM with a LOD of 100 nM. This sensor also shows good selectivity and reproducibility, which is enabled to detect H
2
O
2
in real food samples without any pretreatment in 100 s, providing a new solution for the direct quantitative measurement of H
2
O
2
residues for food safety.