Structural, optical and electrochemical properties of banana, mango leaves and potato extracts reduced graphene oxide

Green synthesis of reduced graphene oxide (rGO) was done using three different plant extracts, such as banana, mango leaves and potato, as the reducing agent. The field-emission scanning electron spectroscopy revealed the formation of thin layers in the morphology of rGO reduced with the green extracts. The X-ray diffraction patterns reveal that the peak for GO (001) appeared at 2θ = 11.01° and in rGO broad peak appeared for the (002) plane at ~21°–26°. The Fourier transform infrared spectroscopy graphs showed the peaks for C=C at ~1571 cm−1, which confirmed the formation of the graphene backbone structure. Raman analysis showed the characteristic G band for the sp2 carbon structure of rGO. The cyclic voltammetry study revealed that the rGO-b exhibits the most significant value of specific capacitance of 176 F g–1 at a 5 mV s–1 scan rate.