Abstract
In this study, the nano-Co3O4 films (NCOFs) have been prepared by a one-step cathodic electrophoretic deposition (C-EPD) in aqueous solutions with micro-additive polyethylenimine at ambient temperature and pressure for oxide film-based supercapacitors. The phase composition and morphology of the NCOFs were studied by X-ray diffraction (XRD) and focused ion beam scanning electron microscope (FIB-SEM), respectively. In addition, the deposition kinetics of nano-Co3O4 particles using C-EPD process were investigated in detail. The electrochemical capacitance behaviors of the NCOFs electrode were analyzed by cyclic voltammetry, galvanostatic charge–discharge studies, and electrochemical impedance spectroscopy in 2 M KOH solution. The electrochemical experiments revealed that the highest capacitance of 233.6 F g−1 at 0.5 A g−1, 93.5 % of which still be maintained after 2000 charge–discharge cycles. These findings suggested the potential application of the NCOFs prepared by C-EPD in the electrochemical supercapacitors.
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Acknowledgments
This work was supported by the National Natural Science Foundation of China (No. 61271059), the Natural Science Foundation Project of Chongqing (No. 2010BB4246), the Science and Technology Development Project of Chongqing (No. CSTC2012gg- yyjs90007), the Fundamental Research Funds for the Central Universities (No. CDJXS12220005), and the Sharing Fund of Chongqing University’s Large-scale Equipment.
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Guo, X., Li, X., Xiong, Z. et al. A comprehensive investigation on electrophoretic self-assembled nano-Co3O4 films in aqueous solution as electrode materials for supercapacitors. J Nanopart Res 18, 144 (2016). https://doi.org/10.1007/s11051-016-3456-4
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DOI: https://doi.org/10.1007/s11051-016-3456-4