Hierarchical three-dimensional MnO2/carbon@TiO2 nanotube arrays for high-performance supercapacitors
Hierarchical three-dimensional MnO2/carbon@TiO2 nanotube arrays for high-performance supercapacitors
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用于高性能超级电容器的分层三维MnO2/碳@TiO2纳米管阵列
DOI:
10.1039/c6ra13628a
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发表时间:
2016-07
期刊:
影响因子:
3.9
通讯作者:
Wu, Yucheng
中科院分区:
文献类型:
--
作者:
Qin, Yongqiang;Zheng, Hongmei;Zhang, Yong;Wu, Yucheng
Highly ordered TiO2 nanotube arrays (TNAs) modified by other materials with enhanced conductivity and capacitance have been considered to be promising anode materials for supercapacitors. In this work, carbon@TiO2 nanotube arrays (CTNAs) were firstly synthesized through a calcination process under an Ar atmosphere. Then the hierarchical three-dimensional MnO2/carbon@TiO2 nanotube arrays (CMTNAs) were further developed via hydrothermal deposition of uniformly dispersed MnO2 nanoparticles with the help of the in situ reduction effect of the as-obtained carbon layers. The CTNA electrode exhibited a high area capacitance of 5.58 mF cm−2 at a scan rate of 100 mV s−1, which is about 11 times higher than that of the TiO2 nanotube arrays annealed under an air atmosphere (ATNAs). The highest gravimetric capacitance 521.4 A g−1 was achieved with the CMTNAs at a current density of 2 A g−1, and 88.6% of the initial capacitance could be maintained at a current density of 5 A g−1 up to 2000 cycles via a galvanostatic charge–discharge test.
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