Enzyme-free Electroreduction of Hydrogen Peroxide at Polypyrrole/Graphene/Au Microelectrode Based on Three-electrode-system Array

摘要

This work reported a one-step electroposition to fabricate a graphene nanosheets doped polypyrrole modified gold (PPy/GENS/Au) electrode at the on-chip three-electrode-system electrochemical sensor array. The PPy/GENS/Au electrode exhibited excellent electrochemical properties of large current response, good reproducibility and stability. When applied for the detection of hydrogen peroxide (H_2O_2), this proposed sensor carry out a rapid, direct and selective determination of H_2O_2 with the linear range from 1 to 1OmM (R-square=0.9914) and a sensitivity of about 32 μA mM ~(-1)cm~(-2). The simple and low-cost construction of PPy/GENS/Au electrode shows a great promise to fabricate mass-produced nano-platform for potential application of biosensing analysis in a lab-on-a-chip system.