Hierarchical NiCoS@NiCoP core-shell nanocolumn arrays on nickel foam as a binder-free supercapacitor electrode with enhanced electrochemical performance.

Author(s) Chang, X.; Li, W.; Liu, Y.; He, M.; Zheng, X.; Bai, J.; Ren, Z.
Journal J Colloid Interface Sci
Date Published 2019 Mar 07

A novel hierarchical core-shell nanocolumn array, with NiCoS hollow nanowire (NiCoS H-NW) as the core and NiCoP nanosheet (NiCoP NS) as the shell, has been directly synthesized on nickel foam (NF) as self-supported, binder-free electrode for high-performance supercapacitors. The morphological characterizations reveal that the diameter of NiCoS H-NW core is ∼100 nm and the diameter of single NiCoS@NiCoP core-shell nanocolumn is ∼250 nm. Through a series of electrochemical tests and the analysis of charge storage kinetics, hierarchical NiCoS@NiCoP/NF electrode presents high areal specific capacitance of 5.98 F/cm at 1 mA/cm, outstanding rate capability (70.29% capacitance retention with the current density increased from 1 to 50 mA/cm) and superior cycling stability (92.94% of original capacity is retained after 5000 cycles at 10 mA/cm). The prominent performance of NiCoS@NiCoP/NF electrode could be resulted from their unique hierarchical core-shell nanocolumn structure, which could offer abundant active sites near the interface for fast electrochemical reaction, and validly avoid the collapse of internal structure for the stability of whole structure in the repeated electrochemical measurement. The novel NiCoS@NiCoP/NF electrode offers a new method for future electrochemical energy storage devices with high-stability.

DOI 10.1016/j.jcis.2018.11.080
ISSN 1095-7103
Citation J Colloid Interface Sci. 2019;538:3444.

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