Magnetic and Electrochemical Properties of NiCo2O4 Microbelts Fabricated by Electrospinning

Cobaltate nickel (NiCo2O4) microbelts were fabricated by direct calcination of electrospun precursor samples with an appropriate heating rate. The crystal structure, morphology, magnetic properties, and electrochemical properties of the NiCo2O4 microbelts were investigated by X-ray diffraction, scanning electron microscopy, vibrating sample magnetometry, and electrochemical analysis. The results showed that a heating rate of 1 degrees C.min(-1) resulted in the formation of cubic spinel NiCo2O4 microbelts. After calcination at high temperatures, the microbelts retained their one-dimensional structure. Magnetization results indicated that the NiCo2O4 microbelts were superparamagnetic and their magnetization value at 10 kOe was 6.35 emu.g(-1). Moreover, the electrochemical results suggest that the capacitance of the NiCo2O4 microbelts is typical pseudocapacitive capacitance, and the value of the specific capacitance gradually decreases with increasing discharge current density.