Mesopore-dominant porous carbon derived from bio-tars as an electrode material for high-performance supercapacitors |
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Authors: | Mi-Mi Wei Wen-Ping Li Jie Weng Yun-Quan Liu Shui-Rong Li Yue-Yuan Ye Meng Wang Duo Wang |
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Institution: | 1. College of Energy, Xiamen University, Xiamen, Fujian 361102, China;2. Key Laboratory of Plant Nutrition and Fertilizer, Ministry of Agriculture/Institute of Agricultural Resources and Regional Planning, Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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Abstract: | For the first time, toxic bio-tars collected from the gasification of pine sawdust are used as the precursor for activated carbons. Various types of activation agents including KOH, K2CO3, H3PO4 and ZnCl2 were screened for obtaining superior activated carbons. When KOH was used as an activation agent, the obtained activated carbons exhibited high specific surface area and large mesopore volume. The activated carbons were further employed to be the electrode material of supercapacitors, and its specific capacitance reached up to 260 F g?1 at 0.25 A g?1 current density. Also, it showed an excellent rate performance from preserving a relatively high specific capacitance of 151 F g?1 at 50 A g?1. The assembled device also exhibited the good electrochemical stability with the capacity retention of 90% after 5000 cycles. Furthermore, the maximum energy density of the activated carbons in organic electrolyte reached 17.8 Wh kg?1. |
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Keywords: | Corresponding author Tars Activated carbon Potassium hydroxide Supercapacitors Gasification |
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