Evaluation of nickel oxide-copper oxide nano flowers from saponin for hybrid supercapacitor applications

Abstract

NiO composites doped with metals have effective uses in supercapacitors. Nickel oxide-copper oxide graphitized nanoflower (NiO-CuO-GNF) is made with saponin. We can analyses the shape of nickel oxide-copper oxide nanoflower (NiO-CuO-GNF) using a FESEM examination. The electrochemical performance is evaluated using CV, GCD and EIS. The specific capacitance values of NiO-CuO-GNF and NiO-CuO were 1256F/g and 362F/g, respectively. The NiO-CuO-GNF GCD curves show cyclic stability of 20,000 cycles with three electrode setup and columbic efficiency (%) of 98.8 % at 1 Ag−1. The power density (838 Wkg−1) and the energy density (64 Whkg−1) is achieved using three electrode system. We have also used a two electrode system to study GCD curves in relation to this and results showed greater cyclic stability over 60,000 cycles. There is a power density of 3480 W Kg−1 and an energy density of 20.5 Whkg−1.This work involves hydrothermal method in a single stage which is rarely reported before. The temperature of the method of the synthesis is just 300◦C. The more stable structure of the NiO-CuO-GNF material and its synergistic effect improve the reaction's reversibility, which leads to cyclic stability.