Reduced Graphene Oxide/Hexagonal Boron Nitride-Based Composite as a Positive Electrode in Asymmetric Supercapacitors

The supercapacitor is a promising system for the future generation of energy storage devices instead of batteries due to their high-power density and long cycle life. This work is focused on the design of reduced graphene oxide/hexagonal boron nitride (rGO/h-BN) as electrode materials for supercapacitor applications. The rGO/h-BN composites were prepared via hydrothermal route and investigated in symmetric supercapacitor applications as electrode material. Interestingly, the composite with rGO/h-BN 50:50 showed good capacity when compared with the remaining composites. Similarly, asymmetric supercapacitor devices were made up of rGO/h-BN, and rGO as positive and negative electrodes, respectively, and nickel foam and stainless steel were used as a substrate. The nickel foam as substrate exhibits a high capacitance retention of 90 % after 1000 cycles in a coin cell configuration compare to stainless steel substrate (71 % after 500 cycles). Interestingly, a significant enhancement in the capacitance of Co 3 O 4 was observed when rGO/h-BN composite with Co 3 O 4 . The asymmetric supercapacitor made up of rGO/h-BN/Co 3 O 4 delivered a good capacitance retention of 78 % at 150 mA g -1 , after 5000 cycles. As a result, h-BN/rGO-based composites with super-lattice were synthesized using a hydrothermal approach as prospective materials for next-generation supercapacitor applications