A review for fundamental aspects, electrosynthesis, characterisation and physioelectrochemical properties of highly efficient hybrid supercapacitors

Electrochemical capacitors (ECs), known as supercapacitors, are charge-storage devices that capable of very fast charges and discharges, with a unique combination of high power, highenergy and long lifetime. ECs with these unique properties can bridge the gap between batteries and capacitors, offering great potentials in applications such as starting automotives and regenerating of brake energy. To date, carbon, transition metal oxides and conducting polymers(CPs) [1, 2 ] have been identified as most promising materials for ECs. Each material has its own unique advantages and disadvantages for supercapacitor applications. One of the attempts to obtain the better performance of supercapacitor electrode was to use pervoskite like SrRuO3containing one of element ruthenium. It is expected that the combined Graphen oxide and different metal oxides, a pervoskite i.e. BiFeO3 has to show the similar or perhaps better performance. The bismuth iron oxide in five crystallite phases i.e. BiFeO3, Bi2 Fe4O9 and Bi3Fe5O12 is well known. That means this material may sustain the charges in its phases during the electrochemical changes. In the presented review, different metal oxide, ceramic material and graphen oxide/ conductive polymer as a composite materials were deposited on working electrode by cyclic voltammetry(CV) method and fundamental physielectrochemical aspects, electrochemical performance were evaluated in an aqueous redox super capacitor in acidic medium. Different electrochemical methods including galvanostatic charge–discharge (CD) experiments, cyclic voltammetry (CV) and electrochemical impedance spectroscopy (EIS) were carried out in order to investigate the applicability of the system as a hybrid supercapacitor in detail.

کلیدواژه ها:

electrosynthesis ، impedance ، nanocomposite ، supercapacitor