Exploring the potential of two-dimensional NiCo2O4 sheets//BiPO4 flakes as a hybrid supercapacitor device for energy storage application

In electrochemical energy storage system, transition metal oxide-based active materials are considered has a great avenue to achieving the better charge storage performance. In this research, we demonstrate the aqueous hybrid supercapacitor device utilizing two-dimensional NiCo2O4 sheets and BiPO4 flakes for energy storage applications. The pseudocapacitive behavior of the 2D-BiPO4/NF flakes achieved a capacitance of 855.12 F g−1 (1282.68 mF cm−2) with 85.4% stability retention. Similarly, the battery nature of 2D-NiCo2O4/NF sheets has attained the capacity of 648.3 C g−1 (1080.5 mF cm−2) and shows 91.2% stability retention. The electrochemical results of the 2-D positive and negative electrodes were hugely beneficial to the fast ion and electron transportation, which boosted the predominant capacitive behaviour. The fabricated (2D-NiCo2O4//2D-BiPO4) hybrid supercapacitor device delivers the reasonable energy and power densities of 30.6 Wh kg−1 (38.25 µ Wh cm−2) and 3200 W kg−1 (4000 µ W cm−2) along with 84.5% electrochemical stability after 10,000 GCD counts. The remarkable electrochemical performance of the device was offered by the exceptional electrolyte contact areas and fast electron-ion transportation. The strategy of constructed two-dimensional hybrid system was esteemed as promising energy storage device in future electronic applications. [Display omitted]