Journal
RSC ADVANCES
Volume 4, Issue 55, Pages 29216-29222Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c4ra04103h
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Funding
- National Natural Science Foundation of China [51302101, 21303129]
- Natural Science Foundation of Anhui Province [1408085QE78]
- key Foundation of Educational Commission of Anhui Province [KJ2012A250]
- Huaibei Science and Technology Development Funds [20110305]
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In this work, reduced graphene oxide (RGO) in situ composites with cobalt sulfide (CoS) are achieved through a facile hydrothermal approach. The morphology and structure of the composite materials have been investigated by using scanning electron microscopy (SEM), transmission electron microscopy (TEM), X-ray photoelectron spectra (XPS) and X-ray diffraction (XRD). The results have shown that the composites consist of CoS nanoparticles with a diameter of 30-50 nm uniformly dispersed on the basal plane of RGO. The maximum specific capacitance of 1130 F g(-1) measured by chronopotentiometry at a current density of 0.5 A g(-1) is obtained in a 6 M KOH aqueous solution, which is 2.4 times higher than that of pure CoS nanoparticle electrodes (473 F g(-1)). Furthermore, RGO/CoS nanocomposite exhibits good cycling stability with 92.1% capacitance retention over 1000 cycles.
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