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

doi:10.13208/j.electrochem.180721

Abstract

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.

Key words: porous carbon, BMIMPF₆, rice husk, supercapacitor

CLC Number:

O646

Support info: electrochem.xmu.edu.cn

ZHANG Han-fang, WEI Feng, SUN Jian, JING Meng-ying, HE Xiao-jun. Ionic Liquid Assisted Synthesis of Porous Carbons from Rice Husk for Supercapacitors[J]. Journal of Electrochemistry, 2019, 25(6): 764-772.

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