<p>This study focus on the synthesis and electrochemical characterization of spinel ferrite and C₃N₄ composite materials for energy storage applications. Spinel ferrites such as NiFe₂O₄, CuFe₂O₄, and CoFe₂O₄ were synthesized and combined with C₃N₄ to improve their performance in supercapacitor applications. The synthesis process involved coating 1&#xa0;mg of electrode slurry onto nickel foam to exploit its porous structure, which enhances active material retention. Electrochemical measurements revealed that at a current density of 1 A/g, NiFe₂O₄ exhibited a capacitance value of 238.09 F/g, while the NiFe₂O₄/C₃N₄ composite reached 847.61 F/g, demonstrating superior capacitance retention and good cycling stability. Similarly, CuFe₂O₄ and CuFe₂O₄/C₃N₄ composites were characterized, achieving a capacitance of 424.7 F/g and maintaining 92.8% efficiency over 10,000 cycles. CoFe₂O₄ and CoFe₂O₄/C₃N₄ composites displayed even higher performance, with a capacitance of 2291.03 F/g at 1 A/g. The combination of high surface area C₃N₄ with ferrites enhances active material loading, ion–electron interactions, and charge transfer, leading to improved electrochemical performance. These materials, derived from abundant, non-toxic elements, offer an environmentally friendly, cost-effective solution for energy storage, reducing environmental impact while enhancing performance.</p>