Abstract
In this Letter, cubic Co 3 O 4 samples are synthesised by a simple hydrothermal reaction. The samples are characterised by scanning electron microscopy, transmission electron microscopy, electron diffraction, X-ray powder diffractometer and nitrogen adsorption. The results show that the formed Co 3 O 4 samples are not solid cubes, but cube-like assemblies of nanoparticles. The charge and discharge performances of the cubic Co 3 O 4 crystals are investigated. It shows that the Co 3 O 4 cubes have a high-rate capacity and an excellent cyclability, which is attributed to the high-surface area and porous structure.
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