One step hydrothermal preparation of NiFe₂O₄@g-CN nanosheets for low-cost electrode material storage devices

The increasing interest in spinel ferrites due to their notable characteristics including elevated electrochemical stability, redox states and pseudocapacitive activity which make them suitable for application in supercapacitors. The present research involves synthesis of NiFe₂O₄@g-CN electrode material using hydrothermal route. The various characterization techniques including, electrochemical and physical were used for NiFe₂O₄ and NiFe₂O₄@g-CN nanocomposite. The fabricated NiFe₂O₄@g-CN nanosheet showed exceptional specific capacitance of 740 F/g energy and power density were 38 Wh/Kg and 305 W/Kg respectively at 1 A/g determined from galvanostatic charge discharge plot. The charge transfer resistance (R_ct) value of NFO@g-CN (0.23 Ω) exhibited lower value than NFO (0.35 Ω) and g-CN (0.27 Ω). The electrochemical stability test revealed that after 5000th cycle NiFe₂O₄@g-CN material maintains a very stable structure. Therefore, improvements in electrochemical efficiency of NiFe₂O₄ because of inclusion of graphitic carbon nitride which provided larger surface area, synergistic interaction and large number of active sites. These finding indicates that electrodes materials have potential material for energy storage device and it can further used in toward water splitting and various energy storage equipment’s.