For instance, using a chemical oxidative method, Gautam et al. synthesized PN-NiO composites (PN/NiO) by in-situ polymerization. The as-prepared hybrid electrode showed a specific capacitance of 623 F g -1 at 1 A g -1 current density with capacitance retention of 89% after 5000 cycles at a current density of 20 A g -1 . Similarly, Kenesi et al. reported a ternary composite of PN and Cadmium oxide with graphene oxide (PN/CdO/GO), exhibiting a specific capacitance of 647 F g -1 , with a power and an energy density of 388 W kg -1 and 116.6 Wh kg -1 , respectively, and a capacitance retention of 82% after 500 cycles . Further, it was reported the potentiodynamic in-situ polymerization of ternary PN composites with chromium and graphene oxide (PN/Cr/GO) that reached a specific capacitance of 243 F g -1 with a power density of 3.6 W Kg -1 and an energy density of 21.6 Wh Kg -1 , as well as a capacitance retention of 91% after 5000 cycles .