Fabrication of nickel tungstate nanospheres decorated polyaniline conductive matrixes as positive electrode material for hybrid supercapacitors

A nanocomposite, consisting of nickel tungstate nanospheres embedded in polyaniline conductive matrix (NiWO4@PANI), was synthesized by a hydrothermal method followed by chemical oxidative polymerization and investigated for its potential use as an electrode material in supercapacitors. The structural content of the NiWO4@PANI nanocomposite is confirmed by the XRD and XPS analysis. Additionally, the TEM analysis unveils the effective fabrication of NiWO4 nanospheres decorated with PANI. The NiWO4@PANI electrode exhibits fast electron transportation and improved electrical conductivity in supercapacitor experiments due to its abundant active sites and the synergistic effect between NiWO4 and the conductive PANI matrix. The NiWO4@PANI nanocomposite exhibited a specific capacity (Csp) of 215 C g- 1 at a current density of 1 A g- 1, as determined through three electrode measurements. Further, the as-constructed NiWO4/PANI//AC hybrid supercapacitors (HSC) possess an energy density of 72.17 Wh kg- 1 at a power density of 1279.8 W kg- 1. Thus, the NiWO4/PANI composite demonstrates the initial and beneficial use in supercapacitor applications.