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

## TL;DR

This paper describes a new method to create porous NiCo2O4 nanomaterials with excellent electrochemical performance for energy storage.

## Contribution

A novel in situ polymerization template method is introduced for synthesizing 3D porous NiCo2O4 with enhanced electrochemical properties.

## Key findings

- The material retains 88.9% of its capacitance at high current density (10 A g−1) compared to low current density (1 A g−1).
- The material shows a 246.5% capacitance retention after 3000 charge–discharge cycles, indicating excellent cycling stability.
- XRD and FESEM confirm the formation of a spinel-structured NiCo2O4 with a 3D macroporous/mesoporous architecture.

## Abstract

What are the main findings?
Porous NiCo2O4 nanomaterials were prepared by using an in situ synthesized template method.Porous NiCo2O4 exhibits a 3D macroporous/mesoporous structure.Porous NiCo2O4 nanomaterials are advantageous for increasing cycle life and high-rate performance.

Porous NiCo2O4 nanomaterials were prepared by using an in situ synthesized template method.

Porous NiCo2O4 exhibits a 3D macroporous/mesoporous structure.

Porous NiCo2O4 nanomaterials are advantageous for increasing cycle life and high-rate performance.

What are the implication of the main findings?
The electrode material should be designed with a porous structure.It is necessary to adopt appropriate preparation methods.

The electrode material should be designed with a porous structure.

It is necessary to adopt appropriate preparation methods.

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.