Nanoporous carbons from oxidized green needle coke for use in high performance supercapacitors

作者：Wang Jiu zhou; Wang Li qun; Chen Ming ming^*; Wang Cheng yang; Zhang Cui; He Fei

来源：New Carbon Materials, 2015, 30(2): 141-149.

DOI：10.1016/S1872-5805(15)60180-9

• Supercapacitor
• Water dispersible intermediate
• Surface property
• Porous structure
• Rate performance

Green needle coke was oxidized by a mixture of HNC), and H2SO4(3 :7 vol/vol) acids. The resultant oxidized coke was separated into water dispersible and non-dispersible fractions, which were then activated by KOH using the same KOH/coke weight ratio to obtain two kinds of nanoporous carbons with different pore structures. The oxidized coke and the nanoporous carbons were characterized by XPS, XRD, TEM, N-2 adsorption and electrochemical tests. Results indicate that, at the same KOH/coke ratios, the nanoporous carbons derived from the water-dispersible oxidized coke have higher mass specific capacitances and capacitance retention ratios, and lower resistances than those from the non-dispersible ones when used as an electric double layer capacitor electrode in 6 mol/L KOH, but the former have a lower volumetric specific capacitance than the latter.

• 出版日期2015-4
• 单位天津大学