Facile construction of an Ag/MoSe₂ composite based non-enzymatic amperometric sensor for hydrogen peroxide

We report an electrochemical non-enzymatic method for hydrogen peroxide (H₂O₂) detection based on Ag nanoparticle-decorated MoSe₂ (Ag/MoSe₂-500) hybrid nanostructures. These hybrid nanocomposites are easily prepared by in situ reduction of Ag⁺ on the surface of MoSe₂. Benefiting from the strong synergy of Ag nanoparticles and MoSe₂ nanosheets in enhancing electrical conductivity, the Ag/MoSe₂-500 hybrid nanostructures perform excellent sensing activity for H₂O₂ electrocatalytic reduction with a wide linear range of 0.02-15.2 mM, a high sensitivity of 400.0 μA mM⁻¹ cm⁻² and a low detection limit of 0.39 μM (S/N = 3). Furthermore, the sensor displays satisfactory reproducibility and stability and is applicable for practical quantitative analysis of H₂O₂ in milk and orange juice samples. In a word, Ag/MoSe₂-500 nanocomposites are promising candidates for non-enzymatic H₂O₂ sensing in the fields of biology and food science.