Journal
JOURNAL OF POWER SOURCES
Volume 248, Issue -, Pages 1281-1289Publisher
ELSEVIER
DOI: 10.1016/j.jpowsour.2013.10.046
Keywords
In situ carbon coating; Three dimensional flower-like nanostructures; Cobalt oxide; Supercapacitor
Funding
- National Natural Science Foundation of China [21201085, 21276116, 21103092]
- Program for NCET [12-0629]
- Fundamental Research Funds for the Central Universities [30920130111003]
- Qing Lan Project, Post-Doctoral Research Funding Schemes of Jiangsu Province [1102123C]
- China Postdoctoral Science Foundation [2013T60501]
- Science and Technology Support Plan and Natural Science Foundation of Jiangsu Province [BK2010340, BK2011517, BK2011528]
- Start-Up Foundation of Jiangsu University [10JDG070]
- Excellent Plan Foundation of NUST
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Novel three dimensional (3D) Co3O4/C flower-like nanostructures are synthesized via a facile solvothermal strategy. The samples are characterized by XRD, XPS, FT-IR, Raman, TG, SEM and HRTEM. The results show that the 3D flower-like nanostructures are consisted of numerous 2D nanosheets with the thickness of about 20 nm. The pseudocapacitive behaviors of Co3O4/C and bare Co3O4 flower-like nanostructures are investigated by cyclic voltammograms, galvanostatic charge-discharge and electrochemical impedance spectroscopy test. The results reveal that the Co3O4/C delivers a large specific capacitance of as high as 865 F g(-1) and 330 F g(-1) at 1 mV s(-1) and 0.5 A g(-1), according to CV and galvanostatic test, respectively; while the bare Co3O4 has a poor electrochemical performance, which exhibits specific capacitance of 131.7 F g(-1) and 46.1 F g(-1) at the same condition. The excellent electrochemical performance is attributed to the carbon present on the Co3O4 and the morphology, which possesses large surface area, unique flower-like nanostructures and low equivalent series resistance. (C) 2013 Elsevier B.V. All rights reserved.
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