Synthesis of CeO2/reduced graphene oxide nanocomposite for electrochemical determination of ascorbic acid and dopamine and for photocatalytic applications
By Murali, A.; Lan, Y. P.; Sarswat, P. K.; Free, M. L.
Published in Materials Today Chemistry
2019
Abstract
In this study, the CeO2/reduced graphene oxide (rGO) nanocomposite was synthesized by a facile hydrothermal method. Structure and morphology of the synthesized nanocomposite were characterized by X-ray diffraction and scanning electron microscopy. Raman spectroscopy and X-ray photoelectron spectroscopy were used to quantify the concentration of oxygen vacancies. Compared with the bare glassy carbon electrode (GCE) and CeO2-modified GCE, the CeO2/rGO electrode exhibited an excellent electrochemical activity toward the oxidation of ascorbic acid and dopamine. Increased concentration of oxygen vacancies coupled with the introduction of rGO as a matrix in the composite resulted in the improvement of the conductivity of the nanocrystals, thereby leading to a faster charge transfer. The photocatalytic properties of CeO2 and CeO2/rGO nanocomposite were evaluated using the degradation of methylene blue under UV
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