Electrochemical Determination of Hydrogen Peroxide Using Gold-Platinum Bimetallic Nanoparticles Self-Assembled on L-Cysteamine Modified Glassy Carbon Electrode

摘要

This paper describes a facile and effective method to synthesize gold-platinum nanoflowers (Au-PtNFs) by a controllable electrodeposition method induced by a L-cysteamine (L-Cys) monolayer self-assembled on the surface of a glass carbon electrode (GCE). The Au-Pt/L-Cys/GCE electrodes were characterized by field emission scanning electron microscopy (FE-SEM) and cyclic voltammetry (CV). The morphologies of bimetallic nanoflowers depended on the electrodeposition time and potential. Electrochemical observation showed that the Au-Pt/L-Cys/GCE had a large electroactive surface area and small electron transfer resistance. When the concentration ratio of AuCl~-/PtCl_6~(2-) was 1:1, the resulting electrode displayed high catalytic activity to the reduction of hydrogen peroxide (H_2O_2). The sensor displayed the range from 0.0897 μM to 3.80 μM of H_2O_2 with a detection limit of 0.27 nM.