Table 3: Specific capacitances of Fe3O4 nanospheres measured evaluated in different electrolytes at a fixed current density of 1 A/g.

Specific capacitance (F/g) @ 1 A/g current density
KOH NaOH LiOH
Fe3O4-urea 49.3 46.2 37.0
Fe3O4-ABC 40.3 39.7 38.3
Fe3O4-DDA 56.7 54.1 70.3
Fe3O4-CNS 51.3 42.4 45.3