<p><span lang="EN-GB">For the first time, a new method for preparation of graphene oxide-LaMnO<sub>3 </sub>(GO-LaMnO<sub>3</sub>) nanocompositeas a material of electrochemical sensor for simultaneous determination of catechol (CT) and hydroquinone (HQ)<strong> </strong>is developed. LaMnO<sub>3 </sub>nanoparticles have been characterized by Fourier-transform infrared spectroscopy (FT-IR), scanning electron microscopy (SEM), X-ray diffraction (XRD), transmission electron microscopy (TEM) and energy dispersive X-ray analysis (EDX) technique. Due to the excellent catalytic activity, enhanced electrical conductivity and high surface area, the simultaneous determination of HQ and CT with two well-defined peaks has been achieved at the GO-LaMnO<sub>3 </sub>modified electrode. Comparing with unmodified electrodes, the oxidation currents of HQ and CT increased remarkably. Also, the result exhibited a great decrease in anodic overpotential</span><em></em><span lang="EN-GB">resulting in about 150 mV negative shift of potential. The catalytic peak current values are found linearly dependent on the HQ and CT concentrations in the range of 0.5–433.3 and 0.5–460.0 μM with sensitivity of 0.0719 and 0.0712 μA μM<sup>-1</sup>, respectively. The detection limits for HQ and CT are determined as 0.06 and 0.05 μM, respectively.</span></p>
Background:
Modified electrodes have advanced from the initial studies that were aimed at understanding
electron transfer in films to applications in such areas as energy production and analytical chemistry. This review
emphasizes the major classes of modified electrodes with mediators that are being explored for improving analytical
methodology. Chemically modified electrodes (CMEs) have been widely used to counter the problems of poor sensitivity
and selectivity faced at bare electrodes. We have briefly reviewed the organometallic and organic mediators that have
been extensively employed to engineer adapted electrode surfaces for detection of different compounds. Also, the
characteristics of the materials that improve the electrocatalytic activity of the modified surfaces are discussed.
Objective:
Improvement and promotion of pragmatic CMEs has generated a diversity of novel and probable strong
detection prospects for electroanalysis. While the capability for handling the chemical nature of the electrode/solution
interface accurately and creatively grows, it is predictable that different mediators-based CMEs could be developed in
electrocatalytic activity and completely new applications be advanced.
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