Abstract
Co3O4 nanorods were prepared by a facile hydrothermal method. Eco-friendly deionized water rather than organic solvent was used as the hydrothermal media. The as-prepared Co3O4 nanorods are composed of many nanoparticles of 30–50 nm in diameter, forming a finger-like morphology. The Co3O4 electrode shows a specific capacitance of 265 F g−1 at 2 mV s−1 in a supercapacitor and delivers an initial specific discharge capacity as high as 1171 mAh g−1 at a current density of 50 mA g−1 in a lithium ion battery. Excellent cycling stability and electrochemical reversibility of the Co3O4 electrode were also obtained.
Highlights
One-dimensional nanomaterials have been attracting much attention for electrochemical energy storage, especially in a supercapacitor and a lithium ion battery [1,2,3]
The low-magnification scanning electron microscopy (SEM) image (Figure 2a) shows that the as-prepared Co3O4 material is composed of many nanorods of several hundreds of nanometers in length. We found these nanorods were formed by stacking many nanoparticles of 30–50 nm in diameter (Figure 2b), showing a finger-like morphology
The morphology of the as-prepared Co3O4 material was investigated by field emission scanning electron microscopy (FESEM) (JEOL JSM-6700F, operating at 20 kV, JEOL Ltd., Tokyo, Japan) and transmission electron microscopy (TEM) (JEOL JEM-2010, operating at 200 kV, JEOL Ltd., Tokyo, Japan)
Summary
One-dimensional nanomaterials have been attracting much attention for electrochemical energy storage, especially in a supercapacitor and a lithium ion battery [1,2,3]. Different from the above methods which are either complicate or toxic for the preparation of Co3O4 nanorods, a facile hydrothermal strategy using H2O as solvent for the large-scale preparation of finger-like Co3O4 nanorods has been performed. These Co3O4 nanorods possess a length of several hundreds of nanometers. The electrochemical properties of the as-prepared Co3O4 nanorods as electrode material in the lithium ion battery or supercapacitor were investigated
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