Engineering Zinc Ion Hybrid Supercapacitor Performance of Graphitic Carbon Nitride Embedded Iron Oxide (Hematite)

Zinc-ion hybrid supercapacitors (ZHSC) gain high traction due to the prosperous unification of batteries and supercapacitors. Especially with graphene discovery nano carbonaceous materials have been the most investigated types in energy storage (ES) utilization including ZHSC. Among carbonaceous materials, graphitic carbon nitride (g-C3N4) possessing polymeric layers, quasi graphene arouses extreme interest due to its low-impact structure with economical yet chemical and mechanical stability inflicted by high nitrogen contents. Herein, we aim to examine the g-C3N4 doping effect on the electrochemical performance of hematite (α-Fe2O3) for ZHSC application. The assembled ZHSC device managed to reach the potential window of 2.0 volts with an efficient specific capacitance (Sc) of 280 F g-1 at a current density of 1 A g-1. Moreover, the highest energy and power densities were 38.8 Wh kg-1 and 20 kW kg-1 respectively. With this remarkable efficiency, the α-Fe2O3/g-C3N4 composite material can be considered a promising cathode material for ZHSC