Modification of a rice husk-based activated carbon by thermal treatment and its effect on its electrochemical performance as a supercapacitor electrode

XIAO Cheng-yuan; ZHANG Wen-li; LIN Hai-bo; TIAN Yong-xia; LI Xin-xin; TIAN Yi-ye; LU Hai-yan

doi:10.1016/S1872-5805(19)60018-1

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Article Navigation > New Carbon Mater. > 2019 > 34(4): 341-348

XIAO Cheng-yuan, ZHANG Wen-li, LIN Hai-bo, TIAN Yong-xia, LI Xin-xin, TIAN Yi-ye, LU Hai-yan. Modification of a rice husk-based activated carbon by thermal treatment and its effect on its electrochemical performance as a supercapacitor electrode. New Carbon Mater., 2019, 34(4): 341-348. doi: 10.1016/S1872-5805(19)60018-1

Citation:

XIAO Cheng-yuan, ZHANG Wen-li, LIN Hai-bo, TIAN Yong-xia, LI Xin-xin, TIAN Yi-ye, LU Hai-yan. Modification of a rice husk-based activated carbon by thermal treatment and its effect on its electrochemical performance as a supercapacitor electrode. New Carbon Mater., 2019, 34(4): 341-348. doi: 10.1016/S1872-5805(19)60018-1

Citation:

XIAO Cheng-yuan, ZHANG Wen-li, LIN Hai-bo, TIAN Yong-xia, LI Xin-xin, TIAN Yi-ye, LU Hai-yan. Modification of a rice husk-based activated carbon by thermal treatment and its effect on its electrochemical performance as a supercapacitor electrode. New Carbon Mater., 2019, 34(4): 341-348. doi: 10.1016/S1872-5805(19)60018-1

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Modification of a rice husk-based activated carbon by thermal treatment and its effect on its electrochemical performance as a supercapacitor electrode

doi: 10.1016/S1872-5805(19)60018-1

1.
College of Chemistry, Jilin University, Changchun 130012, China;
2.
State Key Laboratory of Inorganic Synthesis and Preparative Chemistry, Jilin University, Changchun 130012, China;
3.
Zhuhai College, Jilin University, Zhuhai 519041, China;
4.
PetroChina Pipeline Company, Langfang 065000, China

Funds: National Key Research and Development Program of China (2017YFB0307500); National Natural Science Foundation Project (21573093); Jilin University Science and Technology Innovation Team Project (2017TD-31).

Received Date: 2019-03-05
Accepted Date: 2019-09-10
Rev Recd Date: 2019-07-06
Publish Date: 2019-08-28

Abstract

Abstract

A hierarchically porous rice husk-based activated carbon, which had been prepared by a combined method (carbonization, NaOH-leaching and KOH activation), has a high specific capacitance and power density as a supercapacitor electrode in aqueous or organic electrolytes. It was subjected to a simple thermal treatment at 800℃ for 1 h to modify its microstructure and electrochemical performance. Results indicate that its original hierarchical pore structure is retained and the number of oxygen-containing functional groups is reduced after this modification. Mesopores developed and the volume ratio of mesopores to total pores increased from 25.62 to 33.62%. The modified activated carbon showed a higher specific capacitance of 147 F g^-1 than the unmodified one (116 F g^-1) at a current density of 0.5 A g^-1. The voltage of the modified activated carbon was 84.5% of its initial value after self-discharge for 24 h, which is higher than that (75.2%) of the unmodified one. The capacitance retention of the modified carbon was 92% while that of the unmodified one was 85% after 10 000 galvanostatic charge/discharge cycles at 1 A g^-1, indicating the better cycling stability of the former.
- Supercapacitor,
- Thermal treatment,
- Rice husk,
- Activated carbon,
- Self-discharge

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References(27)

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