Electrochemically Self-Doped TiO2 Nanotube Arrays for Supercapacitors
Electrochemically Self-Doped TiO2 Nanotube Arrays for Supercapacitors
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DOI：
10.1021/jp4082883
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发表时间：
2014-03
影响因子：
3.7
通讯作者：
He Zhou;Yanrong Zhang
中科院分区：
文献类型：
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作者：
He Zhou;Yanrong Zhang
与无取向结构相比，高度有序的二氧化钛纳米管阵列(NTA)具有较大的比表面积和较大的电荷转移路径，因此在超级电容器等储能器件中的应用一直是人们关注的焦点。对二氧化钛的半导体性质进行改性对其在构建高性能超级电容器中的应用具有重要意义。因此，本研究展示了一种新的方法，即通过对原始的TiO2NTAs进行简单的阴极极化处理来制备自掺杂的TiO2NTAs，以提高TiO2NTAs的导电性和电容性能。在−为1.4V(VsSCe)时，自掺杂的TiO2NTAs的载流子密度提高了5个数量级，电容提高了39倍。基于简化传输线模型的阻抗分析表明，自掺杂二氧化钛纳米管的电容性能增强是由于电荷密度的降低.
The application of highly ordered TiO2 nanotube arrays (NTAs) for energy storage devices such as supercapacitors has been attractive and of great interest owing to their large surface area and greatly improved charge-transfer pathways compared to those of nonoriented structures. Modification of the semiconductor nature of TiO2 is important for its application in constructing high-performance supercapacitors. Hence, the present study demonstrates a novel method involving fabrication of self-doped TiO2 NTAs by a simple cathodic polarization treatment on the pristine TiO2 NTAs to achieve improved conductivity and capacitive properties of TiO2. The self-doped TiO2 NTAs at −1.4 V (vs SCE) exhibited 5 orders of magnitude improvement on carrier density and 39 times enhancement in capacitance compared to those of the pristine TiO2 NTAs. Impedance analysis based on a proposed simplified transmission line model proved that the enhanced capacitive behavior of the self-doped TiO2 NTAs was due to a decrease of charge-...