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Preparation and Electrochemical Properties of Flow-Through TiO2 Nanoarray
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Preparation and Electrochemical Properties of Flow-Through TiO2 Nanoarray

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Abstract:

Microstructure-tailored TiO2 nanoarrays with adjustive wall-hole morphology have been designed to improve electrochemical properties. Tubular, porous and flow-through TiO2 nanoarrays are fabricated by one-stepped, two-stepped and three-stepped anodization process under the controlled reaction condition. Tubular nanoarray with the opened-mouth and closed-bottom has a tube diameter of 120-130nm, a length of 8.12μm, and wall thickness of 15nm. Similarly, porous TiO2 nanoarray with the opened-mouth and closed-bottom has a pore diameter of 60-70nm, a length of 8.25μm, neighboring wall distance of 70-80nm. Comparatively, flow-through TiO2 nanoarray with the opened-mouth and opened-bottom has a pore diameter of 110-120nm, a length of 8.56μm, neighboring wall distance of 40nm. In comparison with tubular and porous TiO2 nanoarrays, flow-through TiO2 nanoarray indicates the deceased charge transfer resistance and diffusion-related Warburg impedance, presenting the enhanced current response at the same electrode potential. Accordingly, bottom-opened flow-through TiO2 nanoarray achieves the specific capacitance of 6.35 mF cm-2, which is higher than the bottom-closed tubular and porous TiO2 nanoarrays (2.94 and 3.78 mF cm-2). The flow-through TiO2 nanoarray presents the improved electrochemical performance for the electrochemical energy-storage.

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Journal of Nano Research Vol. 65 View Preview

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Periodical:

Journal of Nano Research (Volume 65)

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1-12

DOI:

https://doi.org/10.4028/www.scientific.net/JNanoR.65.1

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Online since:

December 2020

Authors:

Yi Bing Xie*

Keywords:

Electrochemical, Flow-Through, Porous, TiO2 Nanoarray, Tubular

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* - Corresponding Author

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