Enlarged capacitance of TiO2 nanotube array electrodes treated by water soaking
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- 作者：Chi Zhang ; Ji Xing ; Haowen Fan ; Weikang Zhang ; Maoying Liao…
- 刊名：Journal of Materials Science
- 出版年：2017
- 出版时间：March 2017
- 年：2017
- 卷：52
- 期：6
- 页码：3146-3152
- 全文大小：
- 刊物类别：Chemistry and Materials Science
- 刊物主题：Materials Science, general; Characterization and Evaluation of Materials; Polymer Sciences; Continuum Mechanics and Mechanics of Materials; Crystallography and Scattering Methods; Classical Mechanics;
- 出版者：Springer US
- ISSN：1573-4803
- 卷排序：52
文摘
Anodic TiO2 (ATO) nanotube arrays have been considered as promising electrode materials for super capacitors. However, their specific capacitance value is still not comparable with conventional super capacitor materials. Here, we demonstrate a convenient method for improving the capacitive properties of ATO nanotube arrays for super capacitors, which can be realized simply by soaking the as-anodized ATO nanotube arrays in water at room temperature for a sufficiently long time. The nanotube wall for the soaked ATO nanotube arrays becomes rough, resulting in increased specific surface area. After an electrochemical hydrogenation doping process using potentiodynamic cycling for the ATO samples, the soaked ATO electrodes exhibit a very high average specific capacitance of 20.96 mF cm−2 at a current density of 0.05 mA cm−2, about a threefold improvement over those unsoaked ones that just treated by the electrochemical hydrogenation doping. The presented results demonstrate that the soaking treatment is a facile and cost-effective way to change the morphology of ATO nanotubes and increase specific capacitance, which would be of great industrial interest.