Facile fabrication of GCE/Nafion/Ni composite, a robust platform to detect hydrogen peroxide in basic medium via oxidation reaction

Nickel particles alone can oxidize hydrogen peroxide but confronts extreme stability problem which imparts a barrier to act as sensor. The porous Nafion bed on glassy carbon electrode (GCE) surface provides the sureness of incorporating of Ni particles which was further exploited as an electrochemical sensor for H 2 O 2 detection through oxidative degradation process. The simple electrochemical incorporation of Ni particles along the pores of Nafion improves the stability of the sensor significantly. The oxidative pathway of hydrogen peroxide on GCE/Nafion/Ni was probed by analyzing mass transfer dependent linear sweep voltammograms both in static and rotating modes along with chronoamperometry. An electron transfer step determines the overall reaction rate with k ° = 2.72 × 10 −4 cm s −1 , which is supported by the values of transfer coefficient ( β ) in between (0.68–0.75). Sensing performance was evaluated by recording differential pulse voltammograms (DPVs) with the linear detection limit (LOD) of 1.8 μM and linear dynamic range (LDR) of 5–500 μM . Real samples from industrial sources were successfully quantified with excellent reproducibility mark GCE/Nafion/Ni electrode as an applicable sensor. • A novel electrochemical sensor was developed by Ni particles stabilized by Nafion on GCE for hydrogen peroxide detection. • Lower detection limit (LOD) for hydrogen peroxide detection was achieved significantly lower level as 1.8 μM by differential pulse voltammetry. • The kinetic parameters were determined by static voltammetry and hydrodynamic voltammetric experiment. • The kinetics of hydrogen peroxide oxidation revealed that it was a stepwise dissociative electron transfer mechanism.