期刊
JOURNAL OF POWER SOURCES
卷 396, 期 -, 页码 319-326出版社
ELSEVIER
DOI: 10.1016/j.jpowsour.2018.06.033
关键词
Solid-state supercapacitors; Chrysanthemum-like TiN; Ultrafast charge/discharge rates; High stability
资金
- National Science Foundation for Excellent Young Scholars of China [51522402]
- National Science Foundation of China [51572019]
- [FRF-TP-15-006C1]
A novel chrysanthemum-like titanium nitride (CL-TiN) has been synthesized through hydrothermal method combining reduction and nitridation treatment. The morphology of CL-TiN can be successfully obtained by strict controlling heating rates. The CL-TiN is characterized as microspherical structure with an average diameter of 2 mu m and is assembled from two-dimensional leaf-like nanorods with a width of 200 nm and a length of 500 nm. The CL-TiN is employed to construct supercapacitors and exhibits excellent capacitive performance due to efficient ion diffusion as well as good structural stability. The specific capacitance of the CL-TiN in a three-electrode system is 23.35 F g(-1) at a current density of 1.0 A g(-1) Importantly, the capacitance retention still maintains 90.0% after 10 000 cycles at a scan rate of 0.1Vs(-1), Furthermore, a symmetric flexible-solid-state supercapacitor (FSS-SC) based on CL-TiN nanostructures with Na2SO4/carboxymethyl cellulose (CMC) gel as electrolyte is assembled. The supercapacitor shows excellent volumetric capacitance (7.48Fcm(-3)at 0.05 A cm(-3)), high energy density (0.34mWhcm(-3)) and ultrafast-charging/discharging performance. The cycling stability is remarkable with a capacitance increase of about 36.7% after 20 000 cycles. This work could give a promising guidance for designing and fabricating ultrafast-charging/discharging and excellent stable supercapacitors.
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