Polpa de jatobá como biomassa precursora de carbono poroso ativado autodopante para aplicação em supercapacitores

Abstract

In the search for energy conversion and storage processes that effectively meet the demand for clean energy and a sustainable environment, supercapacitors emerge as a viable solution, as they operate efficiently, sustainably, and with low maintenance costs. Its performance is influenced by the elements that make up its electrode and its properties, which stimulates the search for new materials that improve its performance. Porous carbon materials, derived from biomass, have been highlighted as raw materials for electrodes, as the materials are simple, low-cost, abundant, in addition to having a well-developed pore structure, excellent chemical stability and non aggressiveness to the environment. In this research we examined the physicochemical properties and electrochemical performance of the electrode material derived from the pulp of Jatobá (Hymenaea courbaril), prepared by a combination of carbonization and chemical activation processes using KOH, highlighting the influence of different activation temperatures and different ratios of chemical activator. Where the performance of CAJ was compared with published reports on other activated carbons derived from biomass, and its performance was similar or superior, presenting promising results such as high specific surface area equal to 1,541.96 m2 g-1, mass specific capacitance and area equal to 744.86 F g-1 and 103.27 mF cm-2, respectively, and energy density reaching 148.97 Wh kg-1 with a power density equal to 8.94 kW kg -1, in addition to offer excellent cyclic stability, showing no loss of capacitance after 1,000 cycles. Therefore, the self-doping activated porous carbon, from Jatobá pulp, demonstrates potential for development in supercapacitor electrodes.