Nickel vanadate nitrogen-doped carbon nanocomposites for high-performance supercapacitor electrode.

A nickel-vanadium-based bimetallic precursor was produced using the polymerization process by urea-formaldehyde copolymers. The precursor was then calcined at 800 °C in an argon ambiance to form a NiVO-NC magnetic nanocomposite. Powerful techniques were used to study the physical characteristics and chemical composition of the fabricated NiVO-NC electrode. PXRD, Raman, and FTIR analyses proved that the crystal structure of NiVO-NC included N-doped graphitic carbon. FESEM and TEM analyses imaging showed the distribution of the NiVO nanoparticles on the layered graphitic carbon structure. TEM images showed the prepared sample has a particle size of around 10-15 nm with an enhanced active site area of 146 m/g, as demonstrated by BET analysis. NiVO-NC nanocomposite exhibits magnetic behaviors and a magnetization saturation value of 35.99 emu/g. The electrochemical (EC) studies of the synthesized NiVO-NC electrode proceeded in an EC workstation of three-electrode. In a 5 M potassium hydroxide as an electrolyte, the cyclic voltmeter exhibited an enhanced capacitance () of 915 F/g at 50 mV/s. Galvanic charge-discharge (GCD) study also exhibited a superior capacitive improvement of 1045 F/g at a current density () of 10 A/g. Moreover, the fabricated NiVO-NC nanocomposite displays a good power density () of 356.67 W/kg, improved ion accessibility, and substantial charge storage. At the high energy density () of 67.34 W h/kg, the obtained was 285.17 W/kg. The enhanced GCD rate, cycle stability, and of the NiVO-NC magnetic nanocomposite nominate the sample as an excellent supercapacitor electrode. This study paves the way for developing effective, efficient, affordable, and ecologically friendly electrode materials.