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
Wu, Yucheng
中科院分区:
化学3区
文献类型:
--
作者:
Qin, Yongqiang;Zheng, Hongmei;Zhang, Yong;Wu, Yucheng

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高度有序的TiO 2纳米管阵列(TNAs)被其他材料修饰后具有更高的导电性和电容性,被认为是一种很有前途的超级电容器阳极材料。在这项工作中,碳@TiO2纳米管阵列(CTNAs)首次通过煅烧过程中,在Ar气氛下合成。然后,利用碳层的原位还原作用,通过水热沉积均匀分散的MnO 2纳米颗粒,进一步制备了MnO 2/carbon@TiO2纳米管阵列(CMTNAs)。CTNA电极在100 mV s-1的扫描速率下表现出5.58 mF cm-2的高面积电容,这比在空气气氛下退火的TiO 2纳米管阵列(ATNA)高约11倍。CMTNA在2 A g−1的电流密度下达到最高的重量电容521.4 A g−1,并且通过恒电流充放电测试,在5 A g−1的电流密度下可保持初始电容的88.6%直至2000次循环。
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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