Desenvolvimento de recobrimento de supercapacitores pelo método de Sol-gel utilizando óxido de rutênio

Abstract

The increasing demand for electrical energy and by means of how to store it efficiently has been study of several works, this demand in turn has encouraged the search for new materials that help and improve the performance of devices that are capable of storing electric charge. Supercapacitors are considered promising candidates for future generation power devices because they feature the particularity of releasing large amounts of energy in a short time span. In a very simplified scheme, a supercapacitor is formed by two electrodes, the positive and the negative, separated by a substance containing positive and negative ions (the electrolyte). In this study the development of a coating with capacitive properties in aluminum alloy was made. The coating was produced from the sol-gel process, which forms thin coatings in a very simple and economical way. The electrodes were characterized by electrochemical impedance spectroscopy (EIS) to evaluate the coating capacitance and chronocoulometry to determine loading behavior. The electrochemical behavior of the electrodes was studied in aqueous solution of sulfuric acid, with blank samples, with sol-gel and sol-gel with ruthenium oxide (RuO2).