Ultrasonic modification of carbon materials for electrochemical capacitors

Abstract

The paper is devoted to study the ultrasonic impact on the biomass of natural raw materials, which were used for the creation a nanoporous carbon material (NCM), which was used as electrode material for electrochemical capacitors (EC). The dry shells of apricot seeds were a feedstock, which were modified by the chemical treatment in the phosphoric acid and part of them were impacted by ultrasonic waves for 25 minutes. The NCM, which were obtained by carbonization at 550°C, were modified by chemical treatment in the nitric acid. Thus, the different of modification NCM was obtained to compare their capacitance characteristics for EC. From experimental data we can do a conclusion, that ultrasonic modification and chemical treatment in nitric acidare improvecapacitance characteristics of NCM for EC.

Electrochemical and electrical properties of nickel molybdate / carbon material composites

“…It is established that the maximum specific capacitance of 628 F/g at a scan rate of 1 mV/s in the potential range of -0.15 -0.4 V reaches a composite with a carbon material content of 1 % pre-dispersed by ultrasound, whereas the specific capacitance of pure hydrate of nickel molybdate was 575 F/g. Ultrasonic treatment of carbon material increases the average range of diameters of micro-and mesopores and accordingly increases the capacitive characteristics of composites [8]. However, as the carbon content increases to 10 %, the specific capacitance decreases to 260 F/g, which is probably due to a decrease in the redox activity of nickel ions.…”

“…1b). The specific capacitance of the carbon material is mainly provided by the charge / discharge of the electric double layer at the electrode / electrolyte interface, which is facilitated by the large specific surface area of the carbon material ⁓ 1200 m 2 / g with a large number of micro pores [8].…”

Electrode Materials for Supercapacitors in Hybrid Electric Vehicles: Challenges and Current Progress

“…The collection of Coca-Cola from expired bottles and unfinished drinks made this production in the renewable category. The production of AC from the renewable process is appealing and seems to be an appropriate and viable choice in the future of storage of energy [64].…”