Improving electrochemical performance of reduced graphene oxide by counteracting its aggregation through intercalation of nanoparticles

Abstract Herein, we report the fabrication and characterization of hybrid electrode material for supercapacitor applications. CaCO 3 nanoparticles (Nps) are used as intercalator to avoid the restacking behavior of reduced graphene oxide (rGO) nanosheets. CaCO 3 Nps and rGO sheets are fabricated employing precipitation technique and microwave irradiation method, respectively. The intercalation process is performed by magnetic stirring followed by ultra-sonication technique. As prepared CaCO 3 Nps, rGO and rGO intercalated with 2.5 wt.% and 5 wt.% CaCO 3 Nps are characterized using X-ray diffraction analysis, Fourier transform infrared spectroscopy and field emission scanning electron microscopy to evaluate the crystalline characteristics, molecular vibrations, and morphology, respectively. The prepared electrode materials are coated separately on the glassy carbon electrode and their electrochemical performance displayed remarkable capacitance values for rGO nanosheets intercalated with 2.5 wt.% and 5 wt.% CaCO 3 Nps. From the obtained results, it is clear that the specific capacitance of 2.5 wt.% CaCO 3 intercalated rGO displays higher specific capacitance of 84.5 F/g at 5 mV/s with high retention stability. The mechanism behind the improvement in the electrochemical behavior is due to the increase in active surface area which is explained via Brunauer–Emmett–Teller analysis and energy-dispersive X-ray spectroscopic analysis.