OPTIMIZATION OF SYNTHESIS NICKEL-REDUCED GRAPHENE OXIDE BY MICROWAVE ASISSTED METHOD

• Main Author: ARRIZAL FAKHRI (NIM : 10212077), HAFIZH
• Format: Final Project
• Language: Indonesia
• Online Access: https://digilib.itb.ac.id/gdl/view/22326
• Institution: Institut Teknologi Bandung

Graphene is a two dimensional carbonaceous material. Graphene has high conductivity and wide surface area. Reduced Graphene Oxide can be used as material of anoda battery ion lithium. However, reduced graphene oxide has poor electrochemical performa due to the solid electrolyte interface film resistance and high charge transfer resistace. Added nickel could reduce solid electrolyte interface. Composite reduced graphene oxide-nickel (rGO/Ni) also was synthesized by microwave assisted method. The sampel was varied from 3% rGO/Ni to 20% rGO/Ni, and the microwave process was varied from 0 minute to 80 minutes. Sample was characterized by Fourier Transform Infrared Spectroscope (FTIR), X-Ray Diffractometer (XRD), Scanning Electron Microscope (SEM), 4-point probes, and Electrochemical Impedance Spectroscope (EIS). The FTIR spectra showed the C=O, C-O, and O-H bonds that indicated graphite oxide and its bonding was disappeared at the nickel reduced graphene oxide spectra. The scanning electron microscopy images showed that reduced graphene oxide seems like nanosheets. Futhermore the 4 point probes results showed that increase of nickle concentration in decrease the electrical conductivity. Nevertheless increase microwave radiation times in increase the electrical conductivity. Electrical conductivity are 9.5 S/cm for 3% rGO/Ni and 2.6 S/cm for 20% rGO/Ni respectively. Electrical conductivity are 6.7 S/cm for 8% ni/rGO in 20 minutes microwave radiation process and 11.7 S/cm for 80 minutes microwave radiation process respectively. Finally, electrochemical impedance spectroscopy analysis showed that increase nickle concentration in decrease the surface resistance and increase microwave times in increase surface resistance and charge transfer resisntance.