Electrochemical Sensing of Hydrogen Peroxide Using Pencil GraphiteElectrode Modified with Poly(aniline)/Gold Nanoparticles

In the present work, we report the synthesis, characterization and application of a novel, verysimple, rapid and cost-effective non-enzymatic sensor for electrochemical determination of hydrogen peroxide (H۲O۲). It was fabricated by electrodepositing of poly(aniline) (PANI) and gold nanoparticles (AuNPs) on the surface pencil graphite electrode (PGE).The modified PANI/AuNPs/PGE was characterized using scanning electron microscopy (SEM),X-Ray diffraction (XRD) and cyclic voltametry (CV) techniques. The resulting sensor exhibited a linear response for H۲O۲ over the concentration range of ۰.۰۵-۰.۸۴ mM (μmol L-۱) with a detection limit of μmol L-۱ (S/N=۳), and sensitivity of using the amperometric method.Our results demonstrate that the modified electrodes have excellent H۲O۲ sensing capability, including high reproducibility and stability, a short response time, a wide linear relationship of concentration range (۰.۰۵-۰.۸۴ mM), a very low applied potential (۰.۳۵ V), and a low detectionlimit(۰.۰۷ mM) with great promise in the quantification of H۲O۲ in real samples.