Journal
ELECTROCHIMICA ACTA
Volume 230, Issue -, Pages 428-437Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.electacta.2017.02.032
Keywords
Facial sacrificial template method; NiS; Microflowers; Asymmetric supercapacitor
Categories
Funding
- Natural Science Foundation of China [21106124, 21375116]
- Postdoctoral Science Foundation of China [2014M551668]
- Science and technology foundation of Yangzhou city [YZ2014042]
Ask authors/readers for more resources
Hierarchical NiS was synthesized under different vulcanizing time via a facial sacrificial template method with Ni(OH)(2) microflowers as precursors. The as-prepared samples were characterized by XRD, BET, XPS, SEM and TEM. The results show that the NiS microstructure changes from microflower to microspheres gradually with the increase of vulcanizing time. Impressively, with the reaction time extending to 18 h, the NiS-18 microflowers have the largest surface areas (20.5 m(2.)g(-1)) and the roughest surface. Electrochemical measurements showed that NiS-18 possessed the highest specific capacitance (1315.4 F.g(-1) at current density of 1 A.g(-1)) and excellent cycling stability (89.2% of the C-m retained after 5000 GCD cycles at current density of 10 A.g(-1)). More importantly, an asymmetric supercapacitor (SC), consisting of NiS-18 as positive electrode and active carbon (AC) as negative electrode (NiS//AC), achieves a high potential window of 1.6 V. The NiS//AC displays a high energy density of 33.4 Wh.kg(-1) at power density of 0.8 kW.kg(-1). Additionally, NiS//AC SC exhibits excellent cycling performance (87.3%C-m retained after 5000 GCD cycles at current density of 5 A.g(-1)) and nearly 100% Coulombic efficiency. (C) 2017 Elsevier Ltd. All rights reserved.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available