Abstract
Graphene nanosheets were successfully synthesized by modified Hummer's method using Camellia sinensis extract as a reducing agent, without hydrogen peroxide and any other hazardous solution. X-ray diffraction peak seen at ~3.4 Å interplanar spacing confirms the presence of sp2 carbon bonds. Raman spectra and morphological studies revealed the formation of multilayered graphene sheets. The peak broadening seen in FTIR spectra clearly supports the elimination of oxygen content in these green synthesized graphene sheets besides Raman spectra. The charge transfer resistance of 9.55 Ω obtained in Nyquist plot indicates the good conductivity of graphene. In cyclic voltammetry, a maximum specific capacitance value of 666 F/g is obtained at a scan rate of 5 mV/s. This higher capacitive behavior of the sp2 carbon lattice graphene nanosheets find future application in supercapacitors.
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