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The electrochemical reduction of CO2 to capacitive carbon in molten Li2CO3-Na2CO3-K2CO3 is an effective strategy for capturing and utilizing CO2.This paper reports the effects of the cell voltages and operating temperatures(450-650 ℃)of the molten salt electrolysis on the capacitive performance of electrolytic carbon.The electrolytic carbon delivers excellent specific capacitance when the cell voltage is 4.5 V and the temperature of molten salt is 450 ℃.The carbon obtained at 450 ℃ and under 4.5 V delivers a specific capacitance of 550 F g-1 at 0.2 A g-1 in 1 M aqueous H2SO4,and the capacity retention rate is 73％ after 10000 cycles.The specific capacitance of the electrolytic carbon increases as the electrolysis temperature decreases,and the optimal cell voltage is 4.5 V.