TY - JOUR
T1 - Synthesis of activated carbon nanospheres with hierarchical porous structure for high volumetric performance supercapacitors
AU - Yu, Xiaoliang
AU - Lu, Jiamin
AU - Zhan, Changzhen
AU - Lv, Ruitao
AU - Liang, Qinghua
AU - Huang, Zheng Hong
AU - Shen, Wanci
AU - Kang, Feiyu
N1 - Funding Information:
The authors gratefully thank the National Natural Science Foundation of China (Grant No. 51232005), 973 program of China (No.2014CB932401) for the financial support.
Publisher Copyright:
©2015 Elsevier Ltd. All rights reserved.
Copyright:
Copyright 2015 Elsevier B.V., All rights reserved.
PY - 2015/11/10
Y1 - 2015/11/10
N2 - Activated carbon nanospheres (ACNS) with hierarchical porosity have been synthesized via a low-concentration hydrothermal reaction with phenolic resin as a carbon source and block copolymer F127 as a soft template, followed by subsequent KOH activation. As-obtained ACNS material integrates several advantages, such as a nanoscale particle size, a hierarchical porosity, abundant oxygen-containing functional groups and a high mass density (0.81 g cm-3). The electrochemical tests in KOH aqueous electrolyte shows superior capacitive performances, i.e. both high gravimetric and volumetric capacitance of 243 F g-1 and 198 F cm-3, a large areal capacitance of 25.5 μF cm-2, an excellent rate capability as well as a superior long-term cycling stability (96.1% capacitance retention over 10000 cycles). Moreover, symmetric supercapacitors based on ACNS electrodes achieve a high volumetric energy density of 6.0 Wh L-1, which maintains 3.7 Wh L-1 even at a high power density of 6.6 kW L-1. Such ACNS thus shows great potential as a promising porous carbon material for high volumetric performance supercapacitors.
AB - Activated carbon nanospheres (ACNS) with hierarchical porosity have been synthesized via a low-concentration hydrothermal reaction with phenolic resin as a carbon source and block copolymer F127 as a soft template, followed by subsequent KOH activation. As-obtained ACNS material integrates several advantages, such as a nanoscale particle size, a hierarchical porosity, abundant oxygen-containing functional groups and a high mass density (0.81 g cm-3). The electrochemical tests in KOH aqueous electrolyte shows superior capacitive performances, i.e. both high gravimetric and volumetric capacitance of 243 F g-1 and 198 F cm-3, a large areal capacitance of 25.5 μF cm-2, an excellent rate capability as well as a superior long-term cycling stability (96.1% capacitance retention over 10000 cycles). Moreover, symmetric supercapacitors based on ACNS electrodes achieve a high volumetric energy density of 6.0 Wh L-1, which maintains 3.7 Wh L-1 even at a high power density of 6.6 kW L-1. Such ACNS thus shows great potential as a promising porous carbon material for high volumetric performance supercapacitors.
KW - activated carbon nanospheres
KW - hierarchical porosity
KW - potassium hydroxide activation
KW - supercapacitors
KW - volumetric performance
UR - http://www.scopus.com/inward/record.url?scp=84944096779&partnerID=8YFLogxK
U2 - 10.1016/j.electacta.2015.10.016
DO - 10.1016/j.electacta.2015.10.016
M3 - Journal article
AN - SCOPUS:84944096779
SN - 0013-4686
VL - 182
SP - 908
EP - 916
JO - Electrochimica Acta
JF - Electrochimica Acta
ER -