Ionic Liquid Assisted Synthesis of Porous Carbons from Rice Husk for Supercapacitors

Authors

Han-fang ZHANG, School of Chemistry and Chemical Engineering, Anhui Key Lab of Coal Clean Conversion and Utilization, Anhui University of Technology, Maanshan 243002, China;
Feng WEI, School of Chemistry and Chemical Engineering, Anhui Key Lab of Coal Clean Conversion and Utilization, Anhui University of Technology, Maanshan 243002, China;
Jian SUN, School of Chemistry and Chemical Engineering, Anhui Key Lab of Coal Clean Conversion and Utilization, Anhui University of Technology, Maanshan 243002, China;
Meng-ying JING, School of Chemistry and Chemical Engineering, Anhui Key Lab of Coal Clean Conversion and Utilization, Anhui University of Technology, Maanshan 243002, China;
Xiao-jun HE, School of Chemistry and Chemical Engineering, Anhui Key Lab of Coal Clean Conversion and Utilization, Anhui University of Technology, Maanshan 243002, China;Follow

Corresponding Author

Xiao-jun HE(agdxjhe@126.com)

Abstract

It is still a challenge to prepare carbon materials with high specific surface area at low cost from renewable resources. Herein, the authors report an efficient approach to synthesize porous carbons (PCs) from rice husk with ionic liquid (1-butyl-3-methylimidazolium hexafluorophosphate (BMIMPF₆)) as a template and an activation agent. The as-made PCs featured the high specific surface area up to 1438 m²·g^-1. As electrodes for supercapacitors, PCs showed a high specific capacitance of 256 F·g^-1 at 0.05 A·g^-1 in 6 mol·L^-1 KOH aqueous electrolyte and a good rate performance of 211 F·g^-1 at 10 A·g-1. All the PC electrodes exhibited good cycle stability. This work provides a new way for efficient synthesis of PCs from biomass using BMIMPF₆ as a template and an assisted activation agent for high-performance supercapacitors.

Graphical Abstract

Keywords

porous carbon, BMIMPF6, rice husk, supercapacitor

DOI Link

https://doi.org/10.13208/j.electrochem.180721

Publication Date

2019-12-28

Online Available Date

2018-10-23

Revised Date

2018-08-28

Received Date

2018-07-23

Recommended Citation

Han-fang ZHANG, Feng WEI, Jian SUN, Meng-ying JING, Xiao-jun HE. Ionic Liquid Assisted Synthesis of Porous Carbons from Rice Husk for Supercapacitors[J]. Journal of Electrochemistry, 2019 , 25(6): 764-772.
DOI: 10.13208/j.electrochem.180721
Available at: https://jelectrochem.xmu.edu.cn/journal/vol25/iss6/14