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        Supercapacitive behavior of mesoporous carbon CMK-3 in calcium nitrate aqueous electrolyte

        Heming Luo,Deyi Zhang,Liwen Zheng,Longyan Lei,Jingxiang Wu,Jian Yang 한국화학공학회 2014 Korean Journal of Chemical Engineering Vol.31 No.4

        Calcium nitrate Ca(NO3)2 aqueous solution was found to be an effective aqueous electrolyte for a supercapacitorusing ordered mesoporous carbon as the electrode materials. The supercapacitive behavior of ordered mesoporouscarbon 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 electrodeshows excellent supercapacitive behavior with wide voltage window, high specific gravimetric capacitance and satisfactoryelectrochemical stability in Ca(NO3)2 aqueous electrolyte. The specific gravimetric capacitance of CMK-3 electrodein 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 conventionalaqueous electrolytes NaNO3 and KOH solution about 40% and 54%, respectively. The high charge density of the electricdouble layer formed at the interface of the CMK-3 electrode and Ca(NO3)2 aqueous electrolyte and the pseudo-capacitiveeffect originating from the oxygen groups on the surface of CMK-3 were believed to respond for the excellent supercapacitivebehavior of CMK-3 electrode in Ca(NO3)2 aqueous electrolyte.

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