Direct carbonization of rice husk to prepare porous carbon for supercapacitor applications

Searching low-cost porous carbon is crucial for the future development of supercapacitors in a wide application range. In this paper, rice husk derived carbon (RHC) was prepared through direct carbonization of rice husk in a tube furnace without inlet of N2. RHC possesses relatively high pore volume...

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Bibliographic Details
Published in:Energy (Oxford) 2017-06, Vol.128, p.618-625
Main Authors: Zhang, Wenli, Lin, Nan, Liu, Debo, Xu, Jinhui, Sha, Jinxin, Yin, Jian, Tan, Xiaobo, Yang, Huiping, Lu, Haiyan, Lin, Haibo
Format: Article
Language:English
Subjects:
Capacitance
Carbon dioxide
Carbonization
Electrodes
Electrolytes
Energy storage
Etching
Porous carbon
Porous materials
Rice
Rice husk
Self-activation
Silicon dioxide
Specific surface
Supercapacitor
Supercapacitors
Surface area
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Summary:Searching low-cost porous carbon is crucial for the future development of supercapacitors in a wide application range. In this paper, rice husk derived carbon (RHC) was prepared through direct carbonization of rice husk in a tube furnace without inlet of N2. RHC possesses relatively high pore volume, specific surface area and specific capacitance. The high specific surface area of RHC is attributed to the self-activation of rice husk by H2O, CO2 produced in the carbonization process. RHC was further treated by alkali etching to prepare a porous carbon (referred as RHPC). Owing to the removing of SiO2 in RHC, RHPC exhibits higher specific surface area and specific capacitance than RHC. •Direct carbonization method was used to prepare rice husk-based carbon (RHC).•This direct carbonization method is of low-cost due to the absence of activation.•RHPC with higher specific surface area was prepared from RHC by removing SiO2.•RHPC exhibits high specific capacitance and good rate capability.
ISSN:0360-5442
1873-6785
DOI:10.1016/j.energy.2017.04.065