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Abstract
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In the present study, a simple and highly sensitive electrochemical method was developed for the
determination of hydrogen peroxide (H2O2) through a Ni–Al/layered double hydroxide/Ag nanoparticle
composite modified carbon-paste electrode (Ni–Al/LDH/Ag NPs/CPE) as a renewable electrode in 0.1 M
phosphate buffer solution (PBS, pH ¼ 7.0). Scanning electron microscopy (SEM), atomic force
microscopy (AFM), and X-ray diffraction (XRD) were performed for the characterization of the Ni–Al/
LDH/Ag NP composite. The electrocatalytic activity of the Ni–Al/LDH/Ag NPs/CPE for H2O2 reduction
was studied by cyclic voltammetry and chronoamperometric (at an applied potential of 0.9 V)
methods. The prepared renewable modified electrode as a H2O2 sensor shows good electrocatalytic
activity, fast response time, good stability and reproducibility. The present sensor also displays a linear
range from 10 mM to 10 mM concentration of H2O2 with a detection limit of 6 mM (S/N ¼ 3) and
sensitivity of 1.863 mA mM1 cm2. This sensor was employed successfully for the determination of H2O2
in real samples by the chronoamperometric method, which indicates its applicability in practical analysis.
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