Issue 4, 2017

Serpent-cactus-like Co-doped Ni(OH)2/Ni3S2 hierarchical structure composed of ultrathin nanosheets for use in efficient asymmetric supercapacitors

Abstract

Herein, a rational Co-doped Ni(OH)2/Ni3S2 hybrid was designed and grown in situ on Ni foam (NiCo-10) via a one-pot hydrothermal reaction with two-step temperature control, avoiding the utilization of complicated production processes or high-end technology. Interestingly, the as-prepared NiCo-10 presents a distinct one-dimensional serpent-cactus-like structure consisting of ultrathin internal nanosheets. As a supercapacitor electrode, the hinder-free NiCo-10 exhibits an ultrahigh specific capacitance value of 3023.4 F g−1 at 1 A g−1 and excellent rate performance (capacitance retention of 82.9% up to 20 A g−1), owing to the distinct and available ultrathin serpent-cactus-like structure. Meanwhile, an asymmetric supercapacitor is developed, wherein NiCo-10 is utilized as a positive electrode and activated carbon as a negative electrode. The asymmetric device could exhibit a high specific capacitance value of 136.2 F g−1 (at 1 A g−1), high energy densities of 51.5 W h kg−1 (at 0.825 kW kg−1) and 23.0 W h kg−1 (even at 8.25 kW kg−1), and appropriate cycling stability. The efficient electrochemical performance of NiCo-10 makes it a promising electrode material for the energy storage field.

Graphical abstract: Serpent-cactus-like Co-doped Ni(OH)2/Ni3S2 hierarchical structure composed of ultrathin nanosheets for use in efficient asymmetric supercapacitors

Supplementary files

Article information

Article type
Paper
Submitted
04 nov. 2016
Accepted
06 déc. 2016
First published
23 déc. 2016

J. Mater. Chem. A, 2017,5, 1603-1613

Serpent-cactus-like Co-doped Ni(OH)2/Ni3S2 hierarchical structure composed of ultrathin nanosheets for use in efficient asymmetric supercapacitors

L. Ye, L. Zhao, H. Zhang, P. Zan, S. Gen, W. Shi, B. Han, H. Sun, X. Yang and T. Xu, J. Mater. Chem. A, 2017, 5, 1603 DOI: 10.1039/C6TA09547J

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