Impact of Annealing Temperature on the Energy Storage Performance of CoO2 Nanoparticles Synthesized via Solid State Reaction

TL;DR

This study investigates how annealing temperature affects the energy storage capabilities of CoO2 nanoparticles synthesized via solid-state reaction, focusing on structural, electrochemical, and bandgap properties.

Contribution

It provides new insights into the influence of annealing temperature on the energy storage performance and structural characteristics of CoO2 nanostructures.

Findings

Higher annealing temperatures increase specific capacitance.

Annealed CoO2 shows reduced bandgap compared to unannealed.

Structural properties correlate with electrochemical performance.

Abstract

The solid-state reaction was used to synthesize CoO2 nanostructured material. Cobalt nitrate tetrahydrate and sodium oxide (NaOH) were combined to produce CoO2 nanostructured material. The three synthesized working electrodes were each tested individually, using 3 M KOH as the electrolyte. The CV analysis of a three-electrode system revealed redox peaks, indicating Faradaic processes. The estimated specific capacitances of CoO2, CoO2 (250oC), CoO2 (300oC) nanostructured material at scan rates of (10) mVs-1 is (223, 348, and 473) Fg-1. The diffraction peaks at 2{\theta} = 26.264o, 33.527o, 37.579, 51.264 and 54.367o correspond respectively to the diffraction planes of 111, 112, 200, 211, and 311 of CoO2 nanostructured material. The annealing temperature, which affects the bandgap, can influence the size, shape, and crystallinity of nanostructures. For the unannealed material, the energy bandgap of CoO2 is 2.00 eV, whereas for the annealed material it ranges from 1.77 to 1.86 eV.