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The effects of activation conditions on the supercapacitive performance of porous activated biochar
LU Qun,ZHANG Youwei,WANG Xianyou * #,GAO Jiao,LIU Jia,CHEN Manfang,LIU Min,WANG Xingyan
School of Chemistry, Xiangtan University, Xiangtan 411105, China
*Correspondence author
#Submitted by
Funding: the National Natural Science Foundation of China (No.Nos. 51072173, 51272221, 51302239 ), the Specialized Research Fund for the Doctoral Program of Higher Education(No.Nos. 20134301130001 and 20134301120007)
Opened online:12 May 2017
Accepted by: none
Citation: LU Qun,ZHANG Youwei,WANG Xianyou.The effects of activation conditions on the supercapacitive performance of porous activated biochar[OL]. [12 May 2017] http://en.paper.edu.cn/en_releasepaper/content/4732705
The porous carbons derived from naturally abundant bamboo shoot shell for the application of supercapacitor are further activated by chemical activation with ZnCl2, H3PO4 and K2CO3. The influences of activation condition on the pore structure and physicochemical properties of the as-prepared porous carbon samples are investigated by scanning electron microscopy (SEM), transmission electron microscope (TEM), nitrogen adsorption-desorption isotherm, cyclic voltammogram (CV), galvanostatic charge-discharge (GCD) test, electrochemical impedance spectroscopy (EIS) and cycle life measurement. The results show that the porous activated carbon prepared at 1:1 weight ratio of K2CO3 to bamboo shoot shell exhibits a specific surface area of 1800 m2 g-1 with the average pore size of 3.35 nm (AC-K2CO3-900). In addition, the AC-K2CO3-900 shows a high specific capacitance of 287 F g-1 at the current density of 1 A g-1. Moreover, the AC-K2CO3-900 supercapacitor holds high capacitance retention of 95.80% even after 10000 cycles, indicating its potential prospect for the application of high-performance supercapacitors.
Keywords:Bamboo shoot shell; Porous carbon; Activation conditions; Activated carbon; Supercapacitor

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