Preparation of graphene samples via electrochemical exfoliation of pencil electrode: Physico-electrochemical Characterization
A. Loudiki, M. Matrouf, M. Azriouil, A. Farahi, S. Lahrich, M. Bakasse, M.A. El Mhammedi
Abstract
Graphene Oxide (GO) and Reduced Graphene Oxide (rGO) are an advanced carbon materials due to their excellent properties. This article presents a facile route to synthesize GO by an electrochemical exfoliation route of pencil graphite at ambient temperature. The developed process for graphite electrode exfoliation has lead to a stable multi-layer dispersion of GO/rGO mixture. The exfoliated graphene solution was sonicated for 35 minutes to obtain a uniform dispersion. The prepared product was characterized by Physical (XRD, UV-Vis, FTIR) and electrochemical (CV, EIS) techniques. The product characterization using XRD resulted in the (002) graphite characteristic diffraction peak at 2θ = 26,43° matching a d-spacing of 3,37Ǻ, as the coexistence of GO at (001) reflection signal with 2θ = 11,79° and rGO at 2θ = 23,84° corresponding to a d-spacing of 8,19 and 3,73Ǻ, respectively. The performance of the prepared graphene was tested based on the results of the electrochemical parameters (charge transfer, peak intensity, and reversibility…) of the [Fe(CN)6]3−/4− redox system. This alternative method for graphene synthesis showed a good controllable oxidation level, which makes it an attractive precursor concerning sensing, by considering its interesting properties.