Natural stabilizer-assisted sol–gel synthesis of medium-entropy spinel ferrites: structural and electrochemical insights for supercapacitor applications

Medium-entropy spinel ferrite (MnCoNiZn)Fe 2 O 4 was synthesized through an eco-friendly albumen-assisted sol-gel route using albumen. The material exhibited a high specific capacitance of 408.18 F g −1 at 4 F g −1 in 2M KOH electrolyte.