Enhanced supercapacitor performance through synergistic electrode design: Reduced graphene oxide-polythiophene (rGO-PTs) nanocomposite

• Published in: Chemical engineering journal (Lausanne, Switzerland : 1996) Vol. 492; p. 151843
• Main Authors: Tawade, Anita K., Tayade, Shivaji N., Dubal, Deepak P., Mali, Sawanta S., Kook Hong, Chang, Kumar K. Sharma, Kiran
• Format: Journal Article
• Language: English
• Published: Elsevier B.V 15.07.2024
• Subjects: Conducting polymer; Galvanostatic- Charge discharge; Graphene oxide functionalization; Supercapacitor; Swollen Liquid Crystalline Lamellar Mesophase; Supercapacitor; Swollen Liquid Crystalline Lamellar Mesophase; Conducting polymer; Galvanostatic- Charge discharge; Graphene oxide functionalization
• ISSN: 1385-8947; 1873-3212
• DOI: 10.1016/j.cej.2024.151843

[Display omitted] •The synthesis of rGO-PTs 2D/2D nanocomposite involving in-situ functionalization of graphene oxide (GO) with thiophene.•Formation of new bonds observed in FTIR and the reaction mechanism praposed.•The rGO-PTs 2D/2D nanocomposite stacking is proposed through sulphur content depth profiling using XPS.•The rGO-PTs 2D/2D nanocomposite shows specific capacitance retention efficiency of 106 % even after 10000 cycles. In this investigation, we introduce an innovative method for the fabrication of a 2D/2D nanocomposite, involving the in-situ functionalization of graphene oxide (GO) with thiophene monomer. This approach employs a modified surfactant-based bi-solvent swollen liquid crystalline lamellar mesophase (SLCLM) nanoreactor system, utilizing dimethyl sulfoxide and water as primary solvents. The nanocomposite is formed via simultaneous reactions at both the edge and basal plane of GO with thiophene monomers, resulting in polymerization and reduction to generate graphene oxide-polythiophene (rGO-PTs) nanocomposite. We assess the pseudocapacitive properties of rGO-PTs in a 2 M HCl electrolyte. The cyclic voltammetry (CV) investigations reveal distinctive redox curves, indicative of the materials capacitive behaviour. In the galvanostatic charge–discharge (GCD) study, the rGO-PTs exhibits a discharge duration of 169.50 s within a potential window of −0.2 to 1 V at a current density of 7.5 A/g. This performance corresponds to a significantly higher specific capacitance of 1412 F/g, sustained over 10000 cycles as asymmetric capacitor. Notably, the rGO-PTs nanocomposite retains 106 % of its initial capacitance even after a number cycles, tested at a scan rate of 50 mV/s. The exceptional durability and electrochemical performance of the rGO-PTs nanocomposite position it as a promising alternative to conventional materials such as metals, metal oxides, pure carbonaceous substances, and polymers. The simplicity of the synthesis process, coupled with the nanocomposites outstanding electrochemical characteristics, underscores rGO-PTs potential for advancing in the field of energy storage and supercapacitor technology.