Investigation of Synergistic Effect on Cobalt‐Iron Prussian Blue Analogue Incorporated RGO for High Performance Hybrid Supercapacitor

ABSTRACT Prussian blue analogues are excellent electrode materials for supercapacitor applications due to their unique structural properties. To enhance the conductivity and diffusion mechanism of the material, reduced graphene oxide (RGO) is used to improve the diffusion properties of Prussian blue analogues electrode material. The addition of RGO to the cobalt‐iron Prussian blue analogue increased the contact of the electrode material with the electrolyte solution, resulting in higher diffusion behavior of the material. The energy storage mechanism of cobalt‐iron Prussian blue analogue incorporated RGO (CFPR) showed a combination of electric double‐layer behavior from the RGO and faradaic behavior of the cobalt‐iron Prussian blue analogue. Electrochemical analysis demonstrated the high specific capacitance and enhanced diffusion characteristics of the electrode. CFPR exhibited a high specific capacitance of 2764.5 mF cm −2 at a current density of 1 mA cm −2 . The diffusion analysis explains the diffusion process of the electrode material. The energy density and power density of the two electrode system are 2510 mWh cm −2 and 800 W cm −2 respectively at 2 mA cm −2 current density. Therefore, the cobalt‐iron Prussian blue analogue incorporated RGO is a promising electrode material for hybrid supercapacitor applications.