Electrocodeposition of silver and silicomolybdate hybrid nanocomposite for nonenzymatic hydrogen peroxide sensor

Abstract

Novel silver and silicomolybdate (SiMO) hybrid nanocomposite (Ag–SiMO) has been successfully fabricated for nonenzymatic hydrogen peroxide (H₂O₂) detection. The composite is prepared by the electrocodeposition of silver and silicomolybdate and studied by scanning electron microscopy (SEM) and atomic force microscopy (AFM). In neutral condition, the electrode shows good activity towards H₂O₂ reduction with low overpotential. Amperometric response (E_app. = −0.2 V) provides linear range of 5 × 10⁻⁵–2.345 × 10⁻² M with sensitivity of 974.2 μA mM⁻¹ cm⁻², detection limit of 1 × 10⁻⁷ M (S/N = 3), and response time of 5 s. The Ag–SiMO electrode can analyse H₂O₂ promising a nonenzymatic H₂O₂ sensor due to its low overpotential, high sensitivity, good stability, fast response, and low cost.