In-detailed investigation of Fe3O4 powder derived from waste toner material for supercapacitor electrode application.

In the present investigations, we exhibit the efficacy of Fe3O4 as a supercapacitor electrode material. The working material Fe3O4 was acquired via recovering waste toner material from printers, followed by an annealing process and magnetic separation a few times to obtain the final product as Fe3O4. The obtained material is used in an electroactive manner and then deposited on a Ni-foam substrate to develop a supercapacitor electrode. A range of characterizations characterized the prepared electrodes' physicochemical characteristics and electrochemical investigations. Herewith, we have investigated the molarity effect of KOH electrolyte on the fabricated electrode. The specific capacitance of the electrode was found to be 363 F/g at 10 mV/s within the wide potential window of 1.4 V. Additionally, the electrochemical cyclic stability of the Fe3O4 electrode occurred to be 98 % after 1000 cycles. This shows recycled Fe3O4 still possesses good properties as electrode material for supercapacitor applications and may encourage repurposing waste toner to restrain electronic trash. [ABSTRACT FROM AUTHOR]