Effects of morphology on the electrochemical performance of NiFe2O4 nanoparticles with battery-type behavior

We report the synthesis of NiFe2O4 nanoparticles by the complexation EDTA-citrate method under acidic (pH = 3) and basic (pH = 9) conditions. The structural, optical, vibrational, magnetic, and electrochemical properties were studied. The samples have crystallite sizes of 21 nm (pH 3) and 73 nm (pH 9), with rounded particles and layered structures. The Fe-57 Mossbauer spectra at 12 K showed that both samples had an inverse spinel cation distribution. At 5 K, the sample prepared at pH 9 showed saturation magnetizations of about 50 emu/g. Raman spectra showed typical bands of NiFe2O4 phase. The materials were tested as electrodes under alkaline condition. The cyclic voltammetry and charge-discharge experiments indicated a battery-type behavior, with maximun capacities of 65 and 5 C/g (at specific currents of 3 and 10 A/g) for samples prepared at pH 9 and 3, respectively. This work offers a route for obtaining NiFe2O4 nanoparticles with different morphologies and sizes tuned by the synthesis conditions.

Automated summary

NiFe2O4 nanoparticles with different morphologies and sizes were successfully synthesized by the complexation EDTA-citrate method under different acidic and basic conditions. The samples exhibited good structural, optical, vibrational, magnetic, and electrochemical properties. They showed battery-like behavior under alkaline conditions.