Electrochemical Detection of Hydrogen Peroxide Based on Ag-Deposited Carbon Nanosphere Composites

Hydrogen peroxide (H 2 O 2 ) is closely related to our daily life and health, so it is urgent to accurately detect and analyze its content. Herein, a non-enzymatic H 2 O 2 electrochemical sensor was successfully constructed based on electrodeposited silver nanoparticles (Ag NPs) on carbon nanospheres (CNs). Electrochemical characterization results showed that Ag NPs/CNs/GCE displayed good electrocatalytic performance for H 2 O 2 . The diffusion coefficient (D) and heterogeneous rate constant (k 0 ) of hydrogen peroxide were calculated separately. In addition, the sensor had a wide linear range of 4.98 × 10 −9 ∼ 7.29 × 10 −3 M and a low detection limit of 1.66 × 10 −9 M. It also presented excellent anti-interference properties in the presence of various substances. The content of hydrogen peroxide was further detected in real samples of makeup remover, milk and disinfectant with satisfactory recovery rates, confirming its application potential in routine detection.