Abstract
Porous NiCo(2)O(4) 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 NiCo(2)O(4) 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 NiCo(2)O(4) 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.