Abstract
To accommodate large volume change of Cu2O for improving its supercapacitor performances, Cu2O@Ni-Al LDH core-shell structure was designed and prepared through nickel-aluminum double hydroxide grown on cubic Cu2O via a simple solvent process. The Cu2O core was wrapped by Ni-Al LDH shell, which provides a high specific area for electrochemical reaction. The results show that the specific capacitance and cycle stability of Cu2O@Ni-Al LDH are superior to those of Cu2O cubic particles. The specific capacitance of Cu2O@Ni-Al LDH hybrid electrode was up to 389 F g−1 at 1 A g−1. Furthermore, a reversible capacitance of 457 F g−1 was obtained after 12,000 cycles at a much higher current density of 10 A g−1. The enhanced performances were ascribed to the unique core-shell structure and the synergistic effects of Cu2O and Ni-Al LDH, which alleviated volume expansion and provided abundant electrochemical active sites.
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Funding
The work was financially supported by Natural Science of Foundation of China (51672114, 51603091), Natural Science Foundation of Jiangsu Province (BK20181469); Foundation from Marine Equipment and Technology Institute for Jiangsu University of Science and Technology, China (HZ20190004).
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Chen, J., Liu, H., Wan, X. et al. Constructing Cu2O@Ni-Al LDH core-shell structure for high performance supercapacitor electrode material. J Nanopart Res 21, 215 (2019). https://doi.org/10.1007/s11051-019-4660-9
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DOI: https://doi.org/10.1007/s11051-019-4660-9