A facile hydrothermal route to spinel CoCo_2O_4 nanotubes and porous nanostructures without assisted surfactants and templates

摘要

Spinel CoCo_2O_4 nanotubes and porous nanostructures have been synthesized by a novel hydrothermal method from Co(NO_3)_2·6H_2O in mixtures of ammonia and cyclohexane at 220 ℃. The morphology and phase of CoCo_2O_4 can be controlled by adjusting the experimental parameters that include the Co~(2+) concentration and the volume ratio of ammonia to cyclohexane. X-ray diffraction and transmission electron microscopy analyses were used to characterize the products. The formation mechanisms of CoCo_2O_4 nanostructures is proposed in detail. The electrochemical properties of the as-prepared samples have been investigated.