Insertion of lithium ion in anatase TiO2 nanotube arrays of different morphology

JOURNAL OF ALLOYS AND COMPOUNDS

卷:712

Article

Bratic, Milan¹  Jugovic, Dragana²  Mitric, Miodrag³  Cvjeticanin, Nikola⁴ 

[1] Univ Belgrade, Vinca Inst Nucl Sci, Lab Atom Phys, Belgrade 11001, Serbia

[2] Inst Tech Sci SASA, Knez Mihailova 35-4, Belgrade, Serbia

[3] Univ Belgrade, Vinca Inst Nucl Sci, Lab Theoret & Condensed Matter Phys, Belgrade 11001, Serbia

[4] Univ Belgrade, Fac Phys Chem, Studentski Trg 12-16, Belgrade, Serbia

关键词: Nanostructured materials;    Electrode materials;    Electrochemical reactions;    Diffusion;    SEM;    X-ray diffraction;   

DOI  :  10.1016/j.jallcom.2017.04.065

来源: Elsevier

【 摘 要 】

Anatase TiO2 nanotube arrays of different morphology were prepared by a two-step process: anodic oxidation at voltages 20-60 V and subsequent annealing at 400 degrees C. By amplifying anodization voltage the inner diameter of nanotubes increased. At 60 V nanotubes changed the shape from cylindrical tube to truncated cone with elliptical opening. Electrochemical insertion of Li-ion in nanotubes was studied by cyclic voltammetry and galvanostatic charge-discharge experiments. The cyclovoltammetric response was fast for all nanotube arrays. The galvanostatic areal charge/discharge capacity of nanotube arrays increased with increasing anodizaton voltage. Although the mass of nanotubes prepared at 45 V was larger, the gravimetrical capacity was much higher for nanotubes prepared at 60 V because of the larger surface area exposed to the electrolyte. Gravimetrical capacity values exceed theoretical bulk capacity of anatase due to the surface storage of Li-ion. Diffusion coefficient of Li-ion was calculated to be between 5.9.10(-16) and 5.9.10(-15) cm(2) s(-1). (C) 2017 Elsevier B.V. All rights reserved.

【 授权许可】

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