An Asymmetric Ultracapacitors Utilizing α-Co(OH)2/Co3O4 Flakes Assisted by Electrochemically Alternating Voltage

被引：122
|
作者：
Jing, Mingjun [1 ]
Yang, Yingchang [1 ]
Zhu, Yirong [1 ]
Hou, Hongshuai [1 ]
Wu, Zhibin [1 ]
Ji, Xiaobo [1 ]
机构：
[1] Cent S Univ, Coll Chem & Chem Engn, Changsha 410083, Hunan, Peoples R China
来源：
ELECTROCHIMICA ACTA | 2014年 / 141卷
基金：
中国国家自然科学基金;
关键词：
alpha-Co(OH)(2)/Co3O4 flakes; alternating voltage; activated carbon; asymmetric supercapacitor; GRAPHENE OXIDE; NI FOAM; HYDROTHERMAL SYNTHESIS; COBALT HYDROXIDES; CO3O4; NANOWIRES; SUPERCAPACITOR; PERFORMANCE; ARRAYS; NANOCOMPOSITE; NANOSHEETS;
D O I：
10.1016/j.electacta.2014.07.075
中图分类号：
O646 [电化学、电解、磁化学];
学科分类号：
081704 ;
摘要：
alpha-Co(OH)(2)/Co3O4 flakes were obtained through alternating voltage induced electrochemical methodology at room temperature. The as-prepared alpha-Co(OH)(2)/Co3O4 flakes displayed a high specific capacitance of 583 F g(-1) at a current density of 1 A g(-1). An asymmetric supercapacitor is further fabricated with the alpha-Co(OH)(2)/Co3O4 nanocomposite as the anode and activated carbon as the cathode in 2 M aqueous KOH solution as electrolyte. This asymmetric capacitor exhibited a maximum energy density of 22.4 Wh kg(-1) at power density of 290 W kg(-1). Moreover, the asymmetric supercapacitor showed an excellent cycling stability without obvious specific capacitance loss after 2000 cycles at a current density of 1 A g(-1). (C) 2014 Elsevier Ltd. All rights reserved.
引用
收藏
页码：234 / 240
页数：7
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