Characterization and Electrochemical Properties of Porous NiCo2O4 Nanostructured Materials Synthesized Using an In Situ Polymerization Template Method

Porous NiCo2O4 nanomaterials were synthesized using in situ-generated polyacrylamide as a template, with cobalt nitrate, nickel nitrate, and urea serving as raw materials. XRD and FESEM analyses confirm the successful formation of spinel-structured NiCo2O4 electrode materials featuring a 3D macroporous/mesoporous architecture and an average crystalline size of approximately 8.1 nm, obtained through calcination of the amorphous precursor. Electrochemical evaluation of the as-prepared NiCo2O4 reveals that the specific capacitance retained at 10 A g−1 reaches 88.9% of the value measured at 1 A g−1, demonstrating excellent rate capability. Furthermore, the material exhibits a gradual increase in specific capacity over 3000 charge–discharge cycles, achieving a capacitance retention of up to 246.5%, which indicates good cycling stability and superior capacity retention.