Facile construction of an Ag/MoSe 2 composite based non-enzymatic amperometric sensor for hydrogen peroxide.

We report an electrochemical non-enzymatic method for hydrogen peroxide (H 2 O 2 ) detection based on Ag nanoparticle-decorated MoSe 2 (Ag/MoSe 2 -500) hybrid nanostructures. These hybrid nanocomposites are easily prepared by in situ reduction of Ag + on the surface of MoSe 2 . Benefiting from the strong synergy of Ag nanoparticles and MoSe 2 nanosheets in enhancing electrical conductivity, the Ag/MoSe 2 -500 hybrid nanostructures perform excellent sensing activity for H 2 O 2 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 H 2 O 2 in milk and orange juice samples. In a word, Ag/MoSe 2 -500 nanocomposites are promising candidates for non-enzymatic H 2 O 2 sensing in the fields of biology and food science.