Molten Salt Electrolytic Fabrication of TiC-CDC and Its Applications for Supercapacitor

doi:10.1016/j.jmst.2016.08.006

Abstract

Abstract:

Titanium carbide derived carbon (TiC-CDC) was prepared by the molten salt electrolytic method in molten salt NaCl-KCl at the potential of 1.3 V using TiC pellets as the anode. X-ray diffraction, scanning electron microscopy and Raman spectrum were used to characterize the composition, morphology and microstructure of TiC-CDC. The electrochemical performance of TiC-CDC for supercapacitor was investigated in 0.5 mol L^-1 Na₂SO₄ by cycle voltammograms, ac impedance spectrum and galvanostatic charge/discharge. TiC-CDC showed excellent electrochemical and capacitive performances and maintained a capacity value of 126.1 F g^-1 after 1000 cycles with a capacity retention rate of 97% at the current density of 3 A g^-1. The current work demonstrated the feasibility of molten salt electrolytic method for preparation of TiC-CDC and provided a non-polluting and environmentally friendly strategy for high performance supercapacitor fabrication.

Key words: Supercapacitor, Electrochemistry, Molten salt

Wan Chaopin, Zhang Rongxia, Wang Shulan, Liu Xuan. Molten Salt Electrolytic Fabrication of TiC-CDC and Its Applications for Supercapacitor[J]. J. Mater. Sci. Technol., 2017, 33(8): 788-792.

Figures/Tables 3

Schematic 1 Experimental setup for the fabrication of TiC-CDC with molten salt electrolysis method.

Fig. 1. (a) X-ray diffraction patterns of TiC and TiC-CDC; (b) Raman spectrum of TiC-CDC; (c) SEM morphology of TiC powders; (d) TEM bright field image of the TiC-CDC; (e) N2 adsorption and desorption isotherm and (f) pore size distribution of the TiC-CDC prepared by the molten salt electrolytic method at 800 °C.

Fig. 2. Electrochemical performances of TiC-CDC for supercapacitors in 0.5 mol L-1 Na2SO4 solution: (a) and (b) cyclic voltammograms curves at the scanning rate of 10 mV s-1; (c) galvanostatic discharge/charge curves at different current densities and the capacitance retention for cycling stability test at the current density of 3 A g-1; (d) ac impedance spectrum and its extended region in the high frequency range.

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