Large scale α-Co(OH)2 needle arrays grown on carbon nanotube foams as free standing electrodes for supercapacitors
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- 作者：Chunlei Wang ; wanglei_201@163.com" class="auth_mail" title="E-mail the corresponding author ; Haili Qu ; Tao Peng ; Kaiyuan Mei ; Yang Qiu ; Yang Lu ; Yongsong Luo ; Benhai Yu ; hnyubenhai@163.com" class="auth_mail" title="E-mail the corresponding author
- 关键词：Three dimensional carbon nanotube foam ; Alpha-Cobalt hydroxide ; Large specific surface area ; Asymmetric supercapacitor
- 刊名：Electrochimica Acta
- 出版年：2016
- 出版时间：10 February 2016
- 年：2016
- 卷：191
- 期：Complete
- 页码：133-141
- 全文大小：2420 K
文摘
We have successfully fabricated 3D carbon nanotube foams macrostructure by direct conversing CO2. Taking these carbon nanotube foams as substrates, large scale mace-like carbon nanotube foams/Co(OH)2 ordered arrays have been fabricated by a simple hydrothermal method. Electrochemical analysis indicates that the carbon nanotube foams hybrid architectures exhibit good energy-storage performance with high specific capacity of 614.3C g−1 at 0.5 A g−1 and 444.5C g−1 at 10 A g−1 calculated based on active materials with a voltage window of 0.45 V. Besides, the electrodes also illustrate excellent long cycle life along with 96.8% specific capacity retained after 3000 cycle tests. An asymmetric supercapacitor was also assembled using carbon nanotube foams/Co(OH)2 as positive electrode and bare carbon nanotube foams as negative electrode. The highest power density and energy density of the asymmetric cell is 7.2 kW kg−1 and 13.0 Wh kg−1, respectively. Moreover, this environmental friendly template-directed CVD technique is adaptable and multitalented, and can be a general strategy for preparing a kind of three-dimensional macroscopic structures with excellent properties and novel applications.