Abstract
Recently Co3O4-based nanostructures have received great interests owing to their potential applications as supercapacitor. In this work, novel three-dimensional (3D) starfish-like Co3O4 nanowire bundles on nickel foam (Co3O4-oNF) were successfully prepared via a facile hydrothermal method. The phase/micro structure and morphology of the sample were identified by X-ray diffraction, scanning and transmission electron microscopy, respectively, and demonstrated a unique 1D–3D combined mesoporous nanostructure. Cyclic voltammetry, chronopotentiometry, and impedance measurements were employed to characterize the electrochemical performance of the specimen in 3.0 M KOH solution, and show that the Co3O4-oNF not only has a superior specific capacitance of 1399.28 F g−1 at a current density of 1.0 A g−1 but also exhibits reliable capacitance retention of 92.26 % after 1000 cycles even at a high current density of 12.5 A g−1. The Nyquist plot reveals that the internal resistance of the specimen is merely 0.9 Ω, indicating that the starfish-like Co3O4 has a solid mechanical bonding with the nickel substrate. The synthesized 3D nanostructured Co3O4 holds great promises for applications in supercapacitor.
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Acknowledgments
Y. Lu acknowledges the funding support from National Natural Science Foundation of China (Grant No. 51301147), the Research Grants Council of the Hong Kong Special Administrative Region of China (GRF No. CityU11209914), and City University of Hong Kong (Project Nos. 7200339 and 9680108). D. Sun acknowledges the funding from RGC project (CityU09/CRF/13G). Part of this work was also supported by the National High-Technology Project (863, No. 2015AA042600) and the National Natural Science Foundation of China for Distinguished Young Scholar (Grant No. 61525107). The authors also thank Mr. Qiaobao Zhang and Mr. Hongti Zhang for the insightful discussions and TEM-EDS analysis.
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Gao, L., Xu, S., Xue, C. et al. Self-assembly of hierarchical 3D starfish-like Co3O4 nanowire bundles on nickel foam for high-performance supercapacitor. J Nanopart Res 18, 112 (2016). https://doi.org/10.1007/s11051-016-3419-9
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DOI: https://doi.org/10.1007/s11051-016-3419-9