Self-ordered Nanotubular TiO₂ Multilayers for High-Performance Photocatalysts and Supercapacitors

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• 作者：Lingxia Zheng^a ; ^b ; Yucheng Dong^a ; ^b ; Haidong Bian^a ; ^b ; Chris Lee^a ; ^b ; Jian Lu^c ; ^d ; Yang Yang Li^a ; ^b ; ^e ; ^{yangli@cityu.edu.hk" class="auth_mail" title="E-mail the corresponding author}
• 关键词：Titania nanotubes ; photocatalysts ; supercapacitors ; multilayers ; anodization
• 刊名：Electrochimica Acta
• 出版年：2016
• 出版时间：10 June 2016
• 年：2016
• 卷：203
• 期：Complete
• 页码：257-264
• 全文大小：1810 K

文摘

Arrays of multilayered TiO₂ nanotubes are successfully fabricated by anodizing commercial Ti foils with multi-pulsed voltage waveforms. The fabricated structures feature an interesting multilayered morphology with each layer consisting of self-ordered TiO₂ nanotubes (diameter of tens of nanometers and length of several hundred nanometers) aligned vertically to the Ti substrate, and the possible growth mechanism is proposed. The novel multilayered TiO₂ nanotubes exhibit significantly enhanced photocatalytic efficiency than the conventional TiO₂ nanotubes and the multilayered nanoporous TiO₂ structures previously reported by our group. Moreover, the multilayered TiO₂ nanotubes are for the first time investigated for supercapacitor applications, enabling superior capacitance and good cycling stability: the specific capacitance of the C-modified multilayered TiO₂ nanotubes is ∼60 times higher than the pristine multilayered TiO₂ nanotubes, and ∼1.6 times of the C-modified single-layered TiO₂ nanotubes.