Abstract
Layered Co3O4 composed of oriented self-assembled micrometer-length rectangular 2D flakes has been successfully synthesized by a hydrothermal method in combination with subsequent calcination process. Structural and morphological characterizations were performed using powder X-ray diffraction and field emission scanning electron microscopy. The component and thermal stability of the sample were measured by FT-IR and thermal analyses, including thermogravimetry and differential thermal analysis. The electrochemical performances of the as-prepared Co3O4 product were investigated by cyclic voltammetry, electrochemical impedance spectroscopy (EIS), and constant current charge/discharge techniques. The electrochemical results demonstrate that the layered Co3O4 product displays good capacitive behavior with a specific capacitance of 263 F g−1 within a potential range of −0.4–0.55 V at a current density of 1 A g−1 and a large capacity retention with 89.4 % of the initial capacitance over 1,000 consecutive cycles at 3 A g−1, indicating that the as-prepared Co3O4 product can be a promising electroactive material for supercapacitor.
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Acknowledgments
We gratefully acknowledge the support of this work by Natural Science Foundation in Gansu Science and Technology Committee (0803RJA005), International Cooperation Project of the Ministry of Science and Technology (No. 2010DFB90690-4), International Cooperation Project of Shanxi Province (No. 2010081031-2), National Nature Science Foundation of China (No. 51002166, 51061130536, 51172251), and Shanxi Province Science Foundation for Youths (No. 2010021023-3).
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Xie, L., Li, K., Sun, G. et al. Preparation and electrochemical performance of the layered cobalt oxide (Co3O4) as supercapacitor electrode material. J Solid State Electrochem 17, 55–61 (2013). https://doi.org/10.1007/s10008-012-1856-7
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DOI: https://doi.org/10.1007/s10008-012-1856-7