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rGO-CeO2 nanocomposite has been employed and significantly improved electrochemical sensors in terms of facility, sensitivity, and accuracy. Additionally, since synthesis procedures play an important role in the structure and properties of nanomaterials, it is necessary to investigate the effect of synthesis procedures to maximize the electrochemical performance of the sensor using rGO-CeO2. In this study, two different approaches, namely in situ and ex situ methods, were used to synthesize GO-CeO2, then GO-CeO2 was reduced by hydrazine to form the final product rGO-CeO2. Subsequently, the morphology and elemental analysis/mapping of these nanocomposites were examined by Scanning Electron Microscopy and Energy Dispersive X-ray Spectroscopy, respectively. Afterwards, the nanocomposites were drop-casted on the surface of glassy carbon electrodes, and the electrochemical properties were evaluated by Cyclic Voltammetry and Electrochemical Impedance Spectroscopy in the presence of ferrocyanide/ferricyanide redox probe. The results indicated that CeO2 nanoparticles were evenly distributed on the surface of wrinkled rGO sheets; also, in comparison to bare glassy carbon electrode, electrodes modified with the nanocomposites from both approaches reported lower charge transfer resistance and peak-to-peak separation, indicating enhanced electron transfer and electrical conductivity, and the electrode modified with rGO-CeO2 from in situ approach having better improvement than the one with rGO-CeO2 from ex situ approach.
Keywords: Reduced graphene oxide, nanoceria, nanocomposite, electrochemical properties© This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.