Background: Hydrogen peroxide (H2O2) is a common reagent in the production and living,
but excessive H2O2 may enhance the danger to the human body. Consequently, it is very important
to develop economical, fast and accurate techniques for detecting H2O2.
Methods: A simple two-step electrodeposition process was applied to synthesize Pd-Cu/Cu2O
nanocomposite for non-enzymatic H2O2 sensor. Cu/Cu2O nanomaterial was firstly electrodeposited
on FTO by potential oscillation technique, and then Pd nanoparticles were electrodeposited on
Cu/Cu2O nanomaterial by cyclic voltammetry. The chemical structure, component, and morphology
of the synthesized Pd-Cu/Cu2O nanocomposite were characterized by X-ray diffraction, scanning
electron microscopy and X-ray photoelectron spectroscopy. The electrochemical properties of
Pd-Cu/Cu2O nanocomposite were studied by cyclic voltammetry and amperometry.
Results: Under optimal conditions, the as-fabricated sensor displayed a broad linear range (5-4000
μM) and low detection limit (1.8 μM) for the determination of H2O2. The proposed sensor showed
good selectivity and reproducibility. Meanwhile, the proposed sensor has been successfully applied
to detect H2O2 in milk.
Conclusion: The Pd-Cu/Cu2O/FTO biosensor exhibits excellent electrochemical activity for H2O2
reduction, which has great potential application in the field of food safety.