High performance supercapacitor electrodes from electrospun Ni₃V₂O₈ nanofibers

In this paper, one-dimensional Ni₃V₂O₈ nanofibers with interconnected nanoparticals was synthesized by a simple and efficient electrostatic spinning technique and subsequent annealing process. X-ray diffraction (XRD), thermogravimetric analysis (TGA), field-emission scanning electron microscopy (FESEM) and transmission electron microscopy (TEM) were employed to systematically characterize the crystal structures and morphology of Ni₃V₂O₈ nanofibers.The experimental results confirmed that the pure Ni₃V₂O₈ was obtained.The FESEM and TEM results show that Ni₃V₂O₈ powder possesses 1D nanostructures with diameters varying from 200 to 300 nm and has a narrow partical size distribution ranging from 20 to 25 nm.The electrochemical measurements indicate that the Ni₃V₂O₈ nanofibers have a ultrahigh specific capacitance of 1 152 F/g at a current density of 1 A/g, 1 345 F/g at a scan rate of 5 mV/s, and excellent cycling stability (the retention 84.08% of initial specific capacitance after 2 000 cycles at 2 A/g). The unique structure of Ni₃V₂O₈ nanofibers can enhance mechanical stability and electrochemical properties including electrical/ionic conductivity.Therefore, Ni₃V₂O₈ nanofibers can be proposed as a promising electrode material for high-performance faradaic pesudocapacitance.