Abstract
In this paper, the core/shell Ni–P@Ni–Co composite with micro-/nanostructure, coating Ni–Co on the precursor Ni–P microspheres, has been synthesized successfully via facile two-step hydrothermal method. The chemical composition and microstructure of as-prepared samples were characterized by XRD, EDS, BET, XPS, SEM, and TEM. The results show that the core/shell composite Ni–P@Ni–Co, with a more rough surface and larger specific surface area (74.2 m2 g−1) than bare Ni–P, exhibits good charge storage performance (the specific capacitance reaches up to 1221.1 F g−1 at the current density of 1 A g−1, 1.8 times of Ni–P under the same conditions), and good cycling performance (the retention of specific capacitance is 95.8% after 5000 cycles at 2 A g−1 current density). To further evaluate the practical application property of Ni–P@Ni–Co, an asymmetric supercapacitor (Ni–P@Ni–Co//AC) was assembled, with the Ni–P@Ni–Co and activated carbon (AC) as the positive and negative electrodes, respectively. The electrochemical results reveal that Ni–P@Ni–Co//AC delivers a high energy density of 28.9 Wh kg−1 at a power density of 0.4 kW kg−1, along with a specific capacitance retention rate of 89.1% and nearly 100% Coulomb efficiency at a current density of 1 A g−1 after 5000 cycles.
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Acknowledgements
This work was financially supported by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD), the Natural Science Foundation of China (No. 21375116) and Postdoctoral Science Foundation of China (2014M551668). The related measure and analysis instrument for this work was supported by the Testing Center of Yangzhou University.
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Li, D., Li, Y., Xu, Z. et al. Core/shell Ni–P@Ni–Co composite with micro-/nanostructure for supercapacitor. J Mater Sci 53, 3647–3660 (2018). https://doi.org/10.1007/s10853-017-1776-0
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DOI: https://doi.org/10.1007/s10853-017-1776-0