Citation: Liu Dechen, Zhang Wenli, Huang Weimin. Effect of removing silica in rice husk for the preparation of activated carbon for supercapacitor applications[J]. Chinese Chemical Letters, ;2019, 30(6): 1315-1319. doi: 10.1016/j.cclet.2019.02.031 shu

Effect of removing silica in rice husk for the preparation of activated carbon for supercapacitor applications

Liu Dechen ^a,1 ,
Zhang Wenli ^b,1 ,
Huang Weimin ^b,c,*,

a.
Jilin Police College, Changchun 130117, China
b.
College of Chemistry, Jilin University, Changchun 130012, China
c.
Key Laboratory of Physics and Technology for Advanced Batteries of Ministry of Education, Changchun 130012, China

huangwm@jlu.edu.cn

Received Date: 22 January 2019
Revised Date: 25 January 2019
Accepted Date: 25 January 2019
Available Online: 22 June 2019

Figures(3)

Renewable biomass-derived activated carbons have attracted attentions for supercapacitor applications. Rice husk is a kind of abundant biomass, which has been studied for the preparation of hierarchical activated carbons. Rice husk is rich in silica. Silica in rice husk affects the formation of pore structure in the KOH activation process, which further affects the electrochemical performance of the resultant activated carbon for supercapacitors. In this paper, the effects of silica in rice husk on the activation process were investigated. When the silica in rice husk is not removed, KOH preferentially reacts with silica to produce silicate, which hinders the formation and enlargement of mesopores; the obtained activated carbon exhibits high microporous ratio, high specific area (up to 3263 m²/g), high specific capacitance (315 F/g at 0.5 A/g), but poor rate capability (51.7% capacitance retention with increasing the current density from 0.5 A/g to 20 A/g). When the silica in rice husk is removed, the pores produced by the removal of silica are etched to mesopores in activation process; the obtained activated carbon exhibits high mesoporous ratio, relative high specific surface area of 2804 m²/g and relative high capacitance of 278 F/g at 0.5 A/g with excellent rate capability (76.6% capacitance retention with increasing the current density from 0.5 A/g to 20 A/g).
- Silica,
- Rice husk,
- KOH activation,
- Pore structure,
- Supercapactiors
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沈阳化工大学材料科学与工程学院沈阳 110142