Hollow Co3O4 microspheres with nano-sized shells: one-step large-scale synthesis, growth mechanism and supercapacitor properties

Content Provider	Semantic Scholar
Author	Feng, Chao Zhang, Jinfeng Deng, Yida Zhong, Cheng Hu, Wenbin
Copyright Year	2015
Abstract	Hollow Co3O4 microspheres with thin spherical shells were produced using a one-step method at a low hydrothermal temperature (120 °C), and could be obtained without the use of a solid template, organic reagent or subsequent calcination. These hollow Co3O4 microspheres possess a diameter of ca. 500 nm and a thin shell thickness of ca. 50 nm. The samples were characterized by field emission scanning electron microscope (SEM), transmission electron microscope (TEM) and powder X-ray diffraction (PXRD). A multistep-splitting growth mechanism was proposed to reveal the formation of hollow Co3O4 microspheres. The successful fabrication of the hollow spherical morphology of these microspheres highlighted the importance of H2O2 dosage and the nitrate concentration. Electrochemical performance tests of the as-prepared samples indicated that the hollow Co3O4 microspheres exhibited ultrahigh specific capacitances of 1227, 1169, 1116, 1035 F g−1 at current densities of 1, 2, 4, 8 A g−1, respectively. After 1000 cycles, the specific capacitance of hollow Co3O4 microspheres showed high charge–discharge reversibility and only a slight decay of less than 3% at a current density of 2 A g−1.
Starting Page	42055
Ending Page	42062
Page Count	8
File Format	PDF HTM / HTML
DOI	10.1039/C5RA03052H
Volume Number	5
Alternate Webpage(s)	https://pubs.rsc.org/en/content/getauthorversionpdf/C5RA03052H
Language	English
Access Restriction	Open
Content Type	Text
Resource Type	Article