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Received June 5, 2013
Accepted December 23, 2013
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Supercapacitive behavior of mesoporous carbon CMK-3 in calcium nitrate aqueous electrolyte
1College of Petrochemical Technology, Lanzhou University of Technology, Lanzhou 730050, China 2State Key Laboratory of Gansu Advanced Non-ferrous Metal Materials, Key Laboratory of Eco-Environment-Related Polymer Materials of the Ministry of Education, Lanzhou University of Technology, Northwest Normal University, Lanzhou 730050, Lanzhou 730070, China
Korean Journal of Chemical Engineering, April 2014, 31(4), 712-718(7), 10.1007/s11814-013-0289-z
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Abstract
Calcium nitrate Ca(NO3)2 aqueous solution was found to be an effective aqueous electrolyte for a supercapacitor using ordered mesoporous carbon as the electrode materials. The supercapacitive behavior of ordered mesoporous carbon CMK-3 electrode in Ca(NO3)2 aqueous electrolyte was investigated utilizing cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), and galvanostatic charge/discharge measurements. CMK-3 electrode_x000D_
shows excellent supercapacitive behavior with wide voltage window, high specific gravimetric capacitance and satisfactory electrochemical stability in Ca(NO3)2 aqueous electrolyte. The specific gravimetric capacitance of CMK-3 electrode in Ca(NO3)2 aqueous electrolyte reaches 210 F g^(-1) at a current density of 1 A g^(-1), which is higher than that in conventional aqueous electrolytes NaNO3 and KOH solution about 40% and 54%, respectively. The high charge density of the electric double layer formed at the interface of the CMK-3 electrode and Ca(NO3)2 aqueous electrolyte and the pseudo-capacitive effect originating from the oxygen groups on the surface of CMK-3 were believed to respond for the excellent supercapacitive behavior of CMK-3 electrode in Ca(NO3)2 aqueous electrolyte.
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