Morphology-dependent MoO3/Ni-F nanostructures with enhanced electrochemical hydrogen peroxide detection

Abstract

The present report investigates the various MoO₃ morphologies prepared via different approaches such as morphologies are cubic sheet, ribbon, and hexagonal sheet. These prepared nanostructures are modified as a MoO₃/Ni-F electrode used to detect hydrogen peroxide (H₂O₂). The influence of the morphology on the microstructural, morphological, electronic state, optical and electrochemical properties of MoO₃ nanostructures are systematically studied. The recorded XRD spectra confirmed that the good crystalline nature with the orthorhombic crystal structure. The FESEM analysis shows that preparation approaches strongly influenced the MoO₃ morphology. The elemental mapping and XPS analysis confirm the formation of MoO₃. The obtained optical band gap values show that the MoO₃ morphology-based bandgap values are 3.38, 3.17, and 2.94 eV. The modified MoO₃/Ni-F electrode electrochemical impedance spectra show the CP-MoO₃ has good conductivity. Moreover, the CP-MoO₃/Ni-F electrode has a wide detection window, long-term stability, reproducibility, and a low detection limit is 1.2 μM. Hence, the CP-MoO₃/Ni-F electrode electrochemical results suggest that the modified electrode has offered a good matrix for toxic contaminants sensing applications.

Keywords: Cyclic voltammetry; Electrochemical sensing; Hydrogen peroxide; Impedance; Nickel foam.