Table 2: Specific capacitances of Fe3O4 nanospheres evaluated in different electrolytes at a fixed scan rate of 5 mV/s.

Specific capacitance (F/g) @ 5 mV/s scan rate
KOH NaOH LiOH
Fe3O4-urea 173.5 113.8 90.84
Fe3O4-ABC 164.1 112.7 94.95
Fe3O4-DDA 173.8 160.7 162.7
Fe3O4-CNS 190.1 110.7 107.6