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Abstract
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In this study, a simple, sensitive and low-cost iodate electrochemical sensor based on graphenized pencil lead electrode
(GPLE) modified with Ag nanoparticles (AgNPs) was presented. The GPLE was simply prepared via electrochemical exfoliation
of pencil lead electrode (PLE) by applying an optimized potential in acidic media. Afterward, silver nanoparticles
were electrochemically deposited on the surface of GPLE using chronoamperometry technique. The fabricated electrode
was carefully characterized by X-ray powder diffraction (XRD) and scanning electron microscopy (SEM) techniques. Electrochemical
behavior and also the electrocatalytic performance of the modified electrode toward the reduction of iodate
were studied in details using cyclic voltammetry (CV) and differential pulse voltammetry (DPV) techniques. The fabricated
sensor responds efficiently to iodate over the concentration range of 0.05 to 75 mM with a detection limit of 0.017 mM and
sensitivity of 0.26 μA μM−1 cm−2. Remarkably enhanced electrocatalytic performance of the modified electrode was ascribed
to the synergistic effect of graphene-like nanostructures with high surface to volume ratio, excellent conductivity and also
the excessive electrocatalytic behavior of silver nanoparticles. The modified electrode was successfully employed for the
determination of iodate in table and sea salt samples.
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