Co3O4 and Co(OH)2 loaded graphene on Ni foam for high-performance supercapacitor electrode

被引:0
|
作者
Rui Miao
Bairui Tao
Fengjuan Miao
Yu Zang
Cuiping Shi
Lei Zhu
Paul K. Chu
机构
[1] Qiqihar University,College of Communications and Electronics Engineering
[2] Qiqihar University,College of Materials Science and Engineering
[3] City University of Hong Kong,Department of Physics and Department of Materials Science and Engineering
来源
Ionics | 2019年 / 25卷
关键词
Electrochemical supercapacitor; Nickel hydroxide; Co; O; Co(OH); Graphene;
D O I
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中图分类号
学科分类号
摘要
Electrode materials with high conductivity and excellent redox characteristics are vital to supercapacitors in electrochemical energy storage. Herein, a graphene/Co3O4/Co(OH)2/Ni electrode synthesized hydrothermally has high specific capacitance and the morphology and structure of the graphene/Co3O4/Co(OH)2/Ni electrodes are characterized systematically. The three electrode charge–discharge test exhibits an excellent specific capacitance of 3216 F g−1 at 5 A g−1. The two electrode charge–discharge capacitance decreases from an initial value of 195 to 140 F g−1 after 5000 cycles showing capacitance retention of 71.1%. A test device is fabricated with (OH)2/Co3O4/graphene/Ni as the positive electrode and carbon/nickel foam as the negative electrode. After charging for 15 s, two such devices in series can efficiently power five 5-mm-diameter light-emitting diodes (LEDs) and the excellent electrochemical performance reveals large potential in next-generation high-performance supercapacitors.
引用
收藏
页码:1783 / 1792
页数:9
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