Synthesis of Surface Roughed Pt Nanowires and Their Application as Electrochemical Sensors for Hydrogen Peroxide Detection

In this paper, platinum nanowires with roughed surface textures were fabricated by a galvanostatic electrodeposition method for electrochemical sensors toward hydrogen peroxide detection. The electrochemical behavior of the glassy carbon electrode modified with these nanowires has been studied for oxidation of hydrogen peroxide by using cyclic voltammetry and amperometry in phosphate buffer solution. Surface roughness was found to enhance the sensitivity of the Pt nanowire based electrochemical sensor towards H₂O₂. The Pt nanowires with rough surfaces displayed higher electrocatalytic response compared to nanowires with smooth surfaces, with a sensitivity of 171 μA mM⁻¹ cm⁻², and linear dynamic range up to 35 mM. The nanowire concentration effect on the sensing behavior was investigated with the best sensitivity output found at a nanowire concentration of roughly 8.6×10⁷ number of nanowires/cm². The new sensor also showed good anti-interference property and exhibited high accuracy when a real water sample containing H₂O₂ was measured.