Synthesis and Investigation of Properties of Reduced Graphene Oxide Modified Using L-lysine and Copper for Oxygen and Hydrogen Evolution Reactions

Articles in Press

Document Type : Original Article

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1 School of Chemistry, College of Science, University of Tehran, Tehran 1417614411, Iran

2 Department of Chemistry, Alborz Campus University of Tehran, Tehran, Iran

Abstract

In this study, the electrocatalytic activity of the functionalized graphene oxide (GO) using L-lysine (GO-Lys) as well as L-lysine and copper (GO-Lys-Cu) was investigated for oxygen and hydrogen evolution reactions. Identification and characterization of GO, GO-Lys and GO-Lys-Cu were done using X-ray diffraction (XRD), Fourier transform infrared spectroscopy (FTIR), Raman spectroscopy, field emission scanning electron microscopy (FESEM) and elemental mapping images. Also, electrochemical impedance spectroscopy (EIS) and linear sweep voltammetry (LSV) were used to investigate the electrochemical properties and electrocatalytic activities. The obtained results not only confirmed the decoration of the GO surface by Lys and Lys-Cu, but also revealed the reduction of graphene oxide (rGO) sheets. EIS results confirmed the lowest charge transfer resistance for Lys-rGO hybrid nanocomposite compared to other synthesized samples. The results obtained of LSV show that the functionalization of GO with Lys-Cu leads to efficient and stable electrocatalytic activity for the oxygen evolution reaction (OER) and hydrogen evolution reaction (HER) with the lowest overpotential (375 and 732 mV, respectively) at the current density of 10 mA/cm2 (1 M KOH) and the smallest Tafel slope is 346 and 160 mV/dec, respectively, compared to GO, L-Lys, GO-Lys and Lys-Cu samples.

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Applied Chemistry Today

Articles in Press, Accepted Manuscript
Available Online from 15 June 2024

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