A simple two-step electrochemical synthesis of graphene sheets film on the ITO electrode as supercapacitors

Abstract

In this study, a simple and controllable two-step electrochemical process is described for the synthesis of graphene sheets (GS) film on a cleaned indium tin oxide (ITO) sheet electrode. Namely, the main procedures involve the electrophoretic deposition (EPD) of graphene oxide (GO) film onto ITO electrode and the subsequent in situ electrochemical reduction (ECR) of GO to generate GS film. X-ray photoelectron spectroscopy (XPS) measurement demonstrates that most of the oxygen-containing functional groups in GO film have been removed after ECR. By electrochemical measurements, the maximum specific capacitance of the prepared GS film electrode was calculated to be 156 F g -1 , besides, the capacitance retention of the material remained 78% after 400 times of cycling, showing a promising prospect as supercapacitor materials.

Polyaniline/graphene/carbon fiber ternary composites as supercapacitor electrodes

“…1a system for 20 s [15][16][17]. Thereafter, GO/CF was obtained by freezedrying to form a 3D structure of GO.…”

Electrophoretic deposition of graphene-related materials: A review of the fundamentals

“…On the one hand, several studies [8,30,68,150,166] have reported that post-EPD reduction or thermal annealing of GRM films leads to compaction, surface smoothing and decrease of the interlayer spacing of the deposited GRM films and fibres through removal of trapped water molecules and/or oxygen-containing functional groups. Formation of crevices [96], protruding GRM sheets edges [77,145], and flaky surfaces [153] have been also reported as the result of post-EPD treatment. On the other hand, some studies [77,106] have not observed significant microstructural changes after post-EPD treatment of GRM films.…”

“…Formation of crevices [96], protruding GRM sheets edges [77,145], and flaky surfaces [153] have been also reported as the result of post-EPD treatment. On the other hand, some studies [77,106] have not observed significant microstructural changes after post-EPD treatment of GRM films. For example, Akhavan et al [106] reported that post-EPD reduction of GRM films with vertically aligned sheets does not alter the films' microstructure.…”

“…Due to its hydrophilic nature, unreduced GO can be suspended relatively easily in aqueous media with zeta potential values reported between -2 to -70 mV, as a function of pH [15,34,74,[76][77][78]. For both acidic and basic conditions, GO exhibits net negative surface charge when suspended in water.…”

Facile synthesis of reduced graphene oxide/MWNTs nanocomposite supercapacitor materials tested as electrophoretically deposited films on glassy carbon electrodes

“…The second step involves deposition of the colloidal particles on the electrode surface to form a uniform film. EPD has proven useful in many applications such as the assembly of nanoparticles to form nanoparticle films [23][24][25] solid oxide fuel cell (SOFC) fabrication [26], hybrid material synthesis [27], and graphene oxide [28].…”