Preparation of activated carbons from mesophase pitch and their electrochemical properties
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The influences of molar ratio of KOH to C and activated temperature on the pore structure and electrochemical property of porous activated carbon from mesophase pitch activated by KOH were investigated. The surface areas and the pore structures of activated carbons were analyzed by nitrogen adsorption, and the electrochemical properties of the activated carbons were studied using two-electrode capacitors in organic electrolyte. The results indicate that the maximum surface area of 3 190 m2/g is obtained at molar ratio of KOH to C of 5:1, the maximum specific capacitance of 122 F/g is attained at molar ratio of KOH to C of 4:1, and 800 °C is the proper temperature to obtain the maximum surface area and capacitance.
Key wordssupercapacitor activated carbon mesophase pitch chemical activation pore structure electrochemical properties
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- WU F C, TSENG R L, HU C C, et al. The capacitive characteristics of activated carbons: Comparisons of the activation methods on the pore structure and effects of the pore structure and electrolyte on the capacitive performance[J]. Journal of Power Sources, 2006, 159(2): 1532–1542.CrossRefGoogle Scholar