Microporous activated carbons from coconut shells produced by self-activation using the pyrolysis gases produced from them, that have an excellent electric double layer performance

SUN Kang; LENG Chang-yu; JIANG Jian-chun; BU Quan; LIN Guan-feng; LU Xin-cheng; ZHU Guang-zhen

doi:10.1016/S1872-5805(17)60134-3

Volume 32 Issue 5

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SUN Kang, LENG Chang-yu, JIANG Jian-chun, BU Quan, LIN Guan-feng, LU Xin-cheng, ZHU Guang-zhen. Microporous activated carbons from coconut shells produced by self-activation using the pyrolysis gases produced from them, that have an excellent electric double layer performance. New Carbon Mater., 2017, 32(5): 451-459. doi: 10.1016/S1872-5805(17)60134-3

Citation:

SUN Kang, LENG Chang-yu, JIANG Jian-chun, BU Quan, LIN Guan-feng, LU Xin-cheng, ZHU Guang-zhen. Microporous activated carbons from coconut shells produced by self-activation using the pyrolysis gases produced from them, that have an excellent electric double layer performance. New Carbon Mater., 2017, 32(5): 451-459. doi: 10.1016/S1872-5805(17)60134-3

Citation:

SUN Kang, LENG Chang-yu, JIANG Jian-chun, BU Quan, LIN Guan-feng, LU Xin-cheng, ZHU Guang-zhen. Microporous activated carbons from coconut shells produced by self-activation using the pyrolysis gases produced from them, that have an excellent electric double layer performance. New Carbon Mater., 2017, 32(5): 451-459. doi: 10.1016/S1872-5805(17)60134-3

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Microporous activated carbons from coconut shells produced by self-activation using the pyrolysis gases produced from them, that have an excellent electric double layer performance

doi: 10.1016/S1872-5805(17)60134-3

1.
Institute of Chemical Industry of Forest Products, Chinese Academy of Forestry, Nanjing 210042, China;
2.
Research Institute of Forestry New Technology of Forestry, Chinese Academy of Forestry, Beijing 100091, China;
3.
School of Agricultural Equipment Engineering, Jiangsu University, Zhenjiang 212013, China;
4.
Jinshan College of Fujian Agriculture and Forestry University, Fuzhou 350002, China

Funds: State Forestry Public Benefit Research Sector (201404610); Natural Science Foundation of China (31400510).

Received Date: 2017-04-06
Accepted Date: 2017-11-13
Rev Recd Date: 2017-08-09
Publish Date: 2017-10-28

Abstract

Abstract

Coconut shell-based activated carbons were prepared by self-activation using the pyrolysis gases generated from them. The process was carried out at high temperatures in a closed reactor filled with coconut shell under a high pressure that was generated by pyrolysis gases. Results indicate that the activated carbon prepared at 900℃ for 6 h has a specific surface area, total pore volume, micropore percentage, iodine adsorption capacity and methylene blue adsorption capacity of 1 194.4 m²/g, 0.528 cm³/g, 87.8%, 1 280 mg/g and 315 mg/g, respectively. When used as the electrode material of electrochemical capacitors this activated carbon exhibits a specific capacitance of 258 F/g, a high capacitance retention rate of 97.2% after 3 000 charge/discharge cycles and a small impedance. The water vapor and carbon dioxide generated by the pyrolysis of the coconut shell in the closed reactor act as activating agents and also increase the pressure of the reaction system. This is favorable for the activation of the formed char. This self-activation method was also used to prepare activated carbons with high adsorption capacities for iodine and methylene blue from almond stones, pecan shells and slash pine sawdust, indicating that it is a very simple, efficient, environmentally friendly and economical method for the preparation of biomass-based activated carbons for supercapacitor electrode materials and adsorption.
- Biomass,
- Microspores activated carbon,
- Self-activation pyrolysis,
- Electrode material,
- Mechanism analysis

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