Fabrication of Polypyrrole-Graphene oxide / Nickel Oxide nanocomposite and investigation of their electrochemical treatment in supercapacitor

One of the great challenges in the twenty-first century is unquestionably energy storage. In response to the needs of modern society and emerging ecological concerns, it is now essential that new, low-cost and environmentally friendly energy conversion and storage systems are found; hence the rapid development of research in this field. The performance of these devices depends intimately on the properties of their materials. Supercapacitors and batteries are two most important technologies which are being viewed as possible solutions for storing the energy generated using alternative sources of energy. Charge transfer in supercapacitors are highly reversible and have long cycle life due to suitable power and energy density. In general, electrodes of electrochemical supercapacitors are made of nano-materials with high surface area and high porosity. Charges can be stored and separated at the interface between the conductive solid particles (such as carbon particles or metal oxide particles) and the electrolyte. This surface can act as a capacitor with a capacitive double layer electrical conductivity. The present study is aimed at the preparation of polypropylene, graphene xide and nickel oxide nanocomposites for the study of its capacitive behavior. For fabrication of mentioned nano composite we used from electrochemical methods. Its capacitive behavior has also been studied by cyclic voltammograms techniques, galvanostatic charge-discharge tests and electrochemical impedance spectroscopy. The results showed that, the presence of graphene oxide in the electrode composition due to its high surface area improves the electrochemical properties of the electrode. On the other hand, the electrodeposition of nickel oxide also improves the capacitance of the electrode.