Hydrogen peroxide detection using a polypyrrole/Prussian blue nanowire modified electrode

Abstract

A hydrogen peroxide sensor based on a polypyrrole (PPy)/Prussian blue (PB) modified electrode was developed. PPy nanowires were prepared by one step template-free electrochemical polymerization on a gold electrode and a PB layer was deposited using an electrochemical method. The introduction of the PPy nanostructure can provide a high surface area and lead to high sensitivity to hydrogen peroxide. The surface morphology of the PPy/PB electrode was characterized by scanning electron microscopy (SEM). The structural features of the PPy/ PB electrode were confirmed by attenuated total reflection infrared (ATR-IR) and X-ray photoelectron spectroscopy (XPS). Chronoamperometry (CA) was used to evaluate the sensitivity of the sensor towards hydrogen peroxide.

Determination of hydrogen peroxide using a Prussian Blue modified macroporous gold electrode

“…The ATR-IR spectra of the mp-PB/Au is depicted in Figure 1S (Electronic Supplementary Material, ESM), a strong band that appears at 2077 cm −1 corresponds to the C ≡ N stretching vibrations of PB, it is in good agreement with the predicted structure of a Au film surface functionalized with PB [2,17]. The deposition of PB on the surface of Au was also investigated by XPS.…”

“…From high resolution, some nano/subnano particles on the branches of the pore wall are obtained. The result demonstrates that the structure of the mp-PB/Au film is mostly governed by the original mp-Au film [2].…”

“…5a. The current is increased rapidly after the addition of H 2 O 2 , and it can achieve a stable state (95 % of the maximum value) within 6 s, indicating a fast electron transfer rate between H 2 O 2 and the modified electrode [2]. The calibration curve for the electrochemical response of the mp-PB/Au modified electrode shows in Fig.…”

“…Prussian Blue (PB) is usually regarded as an "artificial peroxidase" [1,2]. Due to their high activity and selectivity toward the reduction of H 2 O 2 at a low potential, PB modified electrodes have been widely used in electrochemical H 2 O 2 sensors [3,4] where PB acts not only as a catalyst, but also as a charge transfer mediator [2].…”

“…Due to their high activity and selectivity toward the reduction of H 2 O 2 at a low potential, PB modified electrodes have been widely used in electrochemical H 2 O 2 sensors [3,4] where PB acts not only as a catalyst, but also as a charge transfer mediator [2]. Since the first report on the synthesis of PB film through electro-deposition [5], electrochemical method is well known as the most commonly used technique for the preparation of PB.…”