The supercapacitive properties
of Mn3O4 nanoparticles in the presence of 1 M Na2SO4 exhibited a high specific capacitance of
322 F g1 at a current density of 0.5 mA cm2 in the potential range from 0.1 to +0.9 V and about
77% of the initial capacitance was retained after 1000 cycles, indicating that the Mn3O4 electrode owns
a good electrochemical stability and capacitance retention capability.