Electrochemical performance of r-graphene oxide based MnO$_{2}$ nanocomposite for supercapacitor

In this study, we improved the capacitance of carbon based reduced graphene oxide (rGO) and metal oxide based MnO$_{2}$ by preparing nanocomposites of rGO/MnO$_{2}$ nanocomposite using chemical synthesis method. The prepared nanoparticles and nanocomposites are characterized by FTIR spectroscopy, XRD, PL spectroscopy and FESEM with EDAX spectroscopy. FTIR studies disclose the characteristic chemical bonding between the respective materials. The FESEM images demonstrate that the surface structure of rGO and MnO$_{2}$ can be easily tuned by forming the composite of rGO/MnO$_{2}$ materials leading to excellent process ability of the system. The super capacitive behaviors of nanocomposites are evaluated using cyclic voltammetry and galvanostatic charge-discharge techniques. The specific capacitance of rGO/MnO$_{2}$ composite is high compared to that of MnO$_{2}$ nanoparticle. In addition, impedance measurements of the MnO$_{2}$ nanoparticles and rGO/MnO$_{2}$ electrodes are executed proposing that the rGO/MnO$_{2}$ composite electrodes are promising materials for supercapacitor (186.6 Fg$^{-1}$).