Temperature-dependent self-assembly of NiO/Co3O4 composites for supercapacitor electrodes with good cycling performance: from nanoparticles to nanorod arrays†
Abstract
A facile approach for the fabrication of temperature-dependent NiO/Co3O4 composites, such as nanoparticles, mixed morphology and nanorod arrays, has been presented. The as-synthesized NiO/Co3O4 composites, especially for the uniform nanorod array structure, show a good rate capability even at high current densities and an excellent long-term cycling stability (more than 90% retained after 3000 cycles). This improvement can be attributed to the uniform morphology and synergistic effect of NiO and Co3O4 as individual constituents, which promote fast Faradaic charging–discharging reactions and act as an “ion reservoir” that can shorten the diffusion distance. These NiO/Co3O4 composites can be a promising candidate material for high-capacity and low-cost electrodes for supercapacitors.
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