Preparation and Electrochemical Properties of Porous NiCo2O4 Nanostructured Materials by In-Situ Polymerizing Template Method

Porous NiCo₂O₄ nanomaterials were prepared by using in-situ synthesized polyacrylamide as template, and cobalt nitrate, nickel nitrate and urea as raw materials. XRD and FESEM results show the spinel type NiCo2O4 electrode materials with 3D macroporous/mesoporous structure and an average grain size of about 8.1 nm had been synthesized by calcining the amorphous precursor at 300 °C. The electrochemical results of as-calcined NiCo2O4 showed that the specific capacitance at 10 A g^-1 is equivalent to 88.9% of 1 A g^-1, indicating good rate characteristics. After 3000 cycles, the specific capacity gradually increases from 275.2 F g^-1 to 678.4 F g^-1, and the capacitance retention rate is up to 246.5%, suggesting excellent cycling stability and capacity retention rate.